battery NISSAN PULSAR 1987 User Guide
[x] Cancel search | Manufacturer: NISSAN, Model Year: 1987, Model line: PULSAR, Model: NISSAN PULSAR 1987Pages: 238, PDF Size: 28.91 MB
Page 45 of 238
Engine 45
Installed view of the inlet manifold. 1.6 liter models. Air
cleaner removed.
(8) Remove the bolts retaining the throttle cable
bracket to the inlet manifold and place the bracket
with cable(s) attached to one side.
(9) Suitably mark the supply and return fuel
hoses and disconnect them from the throttle body.
(10) Suitably mark and disconnect the air pre-
heat, map sensor, charcoal canister and brake booster
vacuum hoses from the throttle body. (11) Disconnect the electrical connector from the
throttle body. (12) Remove the inlet manifold nuts and with-
draw the inlet manifold assembly. Discard the gasket. Installation is a reversal of the removal procedure
with attention to the following points:
(1) Ensure that all the carbon and old gasket
material is cleaned from the manifold and cylinder
head faces. (2) Check the face of the manifold for distortion
using a straight edge and a feeler gauge. (3) Use a new gasket and ensure that the mani-
fold retaining nuts are tightened to the specified
torque in a spiral pattern from the centre outwards. (4) Connect the vacuum hoses, the throttle cable
and where applicable, the kickdown cable. Adjust the
throttle cable as outlined in the Fuel and Engine
Management section and the kickdown cable as
described in the Automatic Transaxle section. (5) Fill the cooling system as described in the
Cooling and Heating Systems section. (6) Start the engine and check for air, fuel and
water leaks.
INLET MANIFOLD - 1.8 Liter Models
To Remove and Install
NOTE: Due to the high residual pressure
within the fuel system, it will be necessary to
depressurise the system before removing any
fuel supply components. Refer to the Fuel
and Engine Management section for the
correct procedure.
(1) Disconnect the negative battery terminal.
(2) Loosen the hose clamp and disconnect the
air inlet duct from the throttle body. (3) Suitably mark and disconnect the vacuum
hoses from the throttle body. (4) On automatic transaxle models disconnect
the kickdown cable from the throttle lever by releasing
the wire spring clip and re moving the cable and socket
from the ball. (5) Turn the throttle lever to the full throttle
position. Using the slack in the throttle cable, release
the throttle cable end thr ough the slot provided.
(6) Remove the bolts retaining the throttle cable
bracket to the inlet manifold and place the bracket
with cable(s) attached to one side. (7) Disconnect the wiring connectors from the
idle air control (IAC) valve and the throttle position
sensor (TPS).
(8) Disconnect the wiring connectors from the
fuel injectors and manifold air temperature (MAT)
sensor.
NOTE: A small screwdriver or similar tool
can be used to release the wire spring clips
on the injector connectors.
(9) Suitably mark and disconnect the fuel supply
and return lines from the fuel rail. (10) Remove the inlet manifold nuts and with-
draw the inlet manifold assembly. Discard the gasket. Installation is a reversal of the removal procedure
with attention to the following points:
View of the inlet manifold removed from the engine.
Page 46 of 238
46 Engine
(1) Ensure that all carbon and old gasket mate-
rial is cleaned from the manifold and cylinder head
faces. (2) Check the face of the manifold for distortion
using a straight edge and a feeler gauge. (3) Use a new gasket and ensure that the mani-
fold retaining nuts are tightened to the specified
torque in a spiral pattern from the centre outwards. (4) Adjust the throttle cabl e as described in the
Fuel and Engine Management section and the kick-
down cable as described in the Automatic Transaxle
section.
(5) Start the engine and check for air, fuel and
water leaks.
EXHAUST MANIFOLD
To Remove and Install
(1) Bring the engine to operating temperature
and remove the oxygen sensor.
(2) Disconnect the negative battery terminal.
(3) On 1.6 liter models, remove the air cleaner
nuts, disconnect the vacuum hose and withdraw the
air cleaner from the vehicle. (4) Remove the front exhaust pipe flange mount-
ing nuts and separate the exhaust pipe from the
manifold. (5) Remove the heat shield retaining bolts and
withdraw the heat shield from the exhaust manifold. (6) Remove the exhaust manifold to cylinder
head retaining nuts and remove the manifold from the
engine. Discard the manifold gasket. Installation is a reversal of the removal procedure
with attention to the following points:
(1) Ensure that all carbon is cleaned from the
manifold and cylinder head mating surfaces. (2) Check the face of the manifold for distortion
using a straight edge and feeler gauges. (3) Use new gaskets on assembly.
(4) Tighten the exhaust manifold retaining nuts
to the specified torque in the sequence shown in the
illustration. (5) Install the oxygen sensor. Refer to the Fuel
and Engine Management section. (6) Coat the threads of the front exhaust pipe to
manifold retaining nuts with an anti-seize solution
and tighten the nuts to the specified torque.
5. CAMSHAFT DRIVE BELT
Special Equipment Required:
To Adjust — Drive belt adjusting tool
TO REMOVE
(1) Disconnect the negative battery terminal.
(2) Raise the front of the vehicle, support it on
chassis stands and remove the right hand front wheel.
Refer to the Wheels and Tires section. (3) Remove the fasteners securing the engine
splash guard to the right hand front inner mudguard
and remove the splash guard. (4) Loosen the alternator adjusting bolt and if
equipped, the power steering and air conditioning
adjusting bolts. Remove the drive belt(s).
View of the exhaust manifold and components showing
the correct tightening sequence.
View of the 1.8 liter engine with the upper timing belt
cover removed showing the camshaft gear timing
marks. Inset shows the crankshaft pulley timing
marks.
Page 48 of 238
48 Engine
TO INSTAL
(1) Check that the camshaft and crankshaft
timing gears have not been moved and that the timing
marks are still aligned. It will be necessary to tempo-
rarily install the crankshaft pulley to check that the
timing marks are still aligned. (2) Install the drive belt to the crankshaft timing
gear around the water pump gear and onto the
camshaft timing gear.
NOTE: If the original drive belt is being
installed, ensure that the arrow marked on
the belt prior to removal is pointing in the
direction of rotation.
(3) Use the adjusting tool to turn the water
pump assembly sufficiently to engage the water pump
pulley with the drive belt. (4) Install the inner cover lower retaining bolt.
(5) Ensure that the drive be lt is correctly meshed
with the teeth of the camshaft, crankshaft and water
pump gears. Install the crankshaft pulley and tighten
the bolts to Specifications. (6) Adjust the drive belt as described under the
following heading.
(7) Install the drive belt outer cover and fasten
the retaining clips. (8) Install and adjust the alternator and if
equipped, the power steeri ng and air conditioning
drive belts as desc ribed in the Engine Tune-up section.
TO ADJUST
(1) Remove the alternator drive belt and if
equipped, the power steering and air conditioning
drive belts. (2) Release the clips securing the camshaft drive
belt outer cover to the inner cover and remove the
outer cover. (3) Turn the engine in the direction of rotation
until the timing marks on the camshaft and the inner
cover are aligned. (4) Loosen the water pump retaining bolts and
using the adjusting tool, rotate the water pump
housing to gain the required belt tension. The belt is
correctly tensioned when it can be grasped between
the thumb and forefinger midway between the cam-
shaft timing gear and the water pump gear and turned
ninety degrees from i t s operating position.
After the belt has been tensioned, tighten the
water pump retaining bolts to the specified torque.
NOTE: Over tensioning of the drive belt will
result in noisy operation and premature
wear of the belt.
(6) Install the outer drive belt cover.
(7) Install and adjust the alternator, and if
equipped, the power steering and air conditioning
drive belts as desc ribed in the Engine Tune-up section. 6. CAMSHAFT. ROCKER ARMS AND TAPPETS
Special Equipment Required:
To Check Camshaft — Dial gauge, Vee blocks and
micrometers
To Install — Drive belt adjusting tool
It is recommended that a new cylinder head
gasket is installed and the cylinder head bolts renewed
when the camshaft housing is removed.
TO REMOVE
(1) Disconnect the negative battery terminal.
Remove the nuts securing the earth wires to the
cylinder head bolts and remove the earth wires.
(2) On 1.6 liter models, remove the air cleaner
wingnuts and withdraw the air cleaner.
(3) Disconnect the engine breather hoses from
the camshaft housing and the camshaft housing top
cover. (4) Remove the camshaft housing top cover
retaining bolts and remove the top cover. Discard the
gasket.
(5) Remove the camshaft dr ive belt as described
under the previous heading. (6) Using an open ended spanner, hold the
camshaft between the inle t and exhaust lobes of
number four cylinder and remove the camshaft timing
gear retaining bolt and the camshaft timing gear.
(7) Remove the distributor, distributor cap and
high tension leads. If necessary refer to the Fuel and
Engine Management section. (8) Check the camshaft end float before remov-
ing the camshaft from the engine. Mount a dial gauge
to the cylinder block with the plunger bearing on the
distributor drive end of the camshaft. (9) Lever the camshaft towards the dial gauge
and zero the gauge. Move the camshaft in the opposite
direction away from the dial gauge and note the
reading obtained. Check this measurement against
Specifications.
Checking the camshaft end float.
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50 Engine
(4) Ensure that the tappet assemblies are full of
clean engine oil and insert the tappets in their
respective bores in the cylinde r head. Install the thrust
pads to the top of each valve assembly ensuring that
they are returned to their original location.
(5) Coat the contact surfaces of the rocker arms
with molybdenum disulphide grease and install the
rocker arms to their origin al locations on the cylinder
head. (6) Clean the mating surfaces of the camshaft
housing and cylinder head. Apply a bead of Loctite
515 to the cylinder head and camshaft housing mating
surfaces. Take care that no sea lant is forced into the
oil passages and install the camshaft housing to the
cylinder head.
(7) Install new cylinder head bolts and lubricate
the bolts and washers with oil.
(8) Apply an initial torque to the cylinder head
bolts of 25 Nm in the corr ect sequence as shown in
the illustration under the Cylinder Head heading.
Further tighten the head bolts in the correct sequence,
in three separate 60 degree stages. Refer to Specifica-
tions. (9) Install the bolts securing the camshaft
drive
belt inner cover to the camshaft housing. (10) Install the camshaft timing gear to the cam-
shaft ensuring that it is correctly located. Tighten the
camshaft timing gear retain ing boll to the specified
torque. (11) Install and adjust the camshaft drive belt as
described under the previous heading. (12) Install the distributor. Refer to the Fuel and
Engine Management section.
(13) Connect the lower radiat or hose and fill the
cooling system with the required coolant. Refer to the
Cooling and Heating Systems section if necessary. (14) Start and run the engine until normal oper-
ating temperature is attained and tighten the cylinder
head bolts another 30-50 degrees in the correct
sequence, ensuring that the tension does not exceed
135 Nm.
TO RENEW CAMSHAFT OIL SEAL,
CAMSHAFT INSTALLED
(1) Remove the camshaft drive belt from the
camshaft timing gear as described under the previous
heading.
(2) Remove the camshaft housing top cover
retaining bolts, remove the cover and discard the
gasket.
(3) Use an open end spanner to hold the cam-
shaft between the inlet and exhaust lobes of number
four cylinder and remove the camshaft timing gear
retaining bolt and the camshaft timing gear. (4) With a pointed drift, tap a small hole in the
front face of the oil seal. Insert a self tapping screw in
the hole and using a pair of pliers, pull on the screw
to remove the oil seal from the housing.
(5) Clean the seal recess and the camshaft sea!
running surface. (6) Lubricate the lip of a new oil seal with engine
oil and slide the seal over the camshaft. Ensure that
the lip of the seal faces to wards the inside of the
camshaft housing. Tap evenly around the edges of the
seal until it is fully seated in the camshaft housing.
(7) Install the camshaft timing gear to the cam-
shaft, ensuring that it is co rrectly located. Tighten the
camshaft timing gear retain ing bolt to the specified
torque. Do not allow the camshaft to rotate while
tightening the bolt. (8) Install and adjust the drive belt as described
under the previous heading. Ensure that the timing
marks are aligned. (9) Install the camshaft hou sing top cover using a
new gasket. Tighten the retaining bolts to the specified
torque.
7. CYLINDER HEAD
Special Equipment Required:
To Dismantle and Assemble — Valve spring com-
pressor
To Inspect — Dial gauge and straight edge
To Install — Drive belt adjusting tool
TO REMOVE AND INSTAL
NOTE: Due to the high residua! pressure
within the fuel system, it will be necessary to
depressurize the system before removing any
fuel supply components. Refer to the Fuel
and Engine Management section for the
correct procedure.
Allow the engine to cool prior to the
removal of the cylinder head to prevent
possible distortion of the cylinder head.
(1) Disconnect the negative battery terminal and
remove the nuts securing the earth wires to the
cylinder head bolts.
(2) Remove the camshaft drive belt as previ-
ously described.
(3) Disconnect the lower radiator hose and drain
the cooling system. Refer to the Cooling and Heating
Systems section if necessary. (4) Remove the alternator adjusting bracket
mounting bolt and insulating washers from the inlet
manifold. Loosen the adjusting bolt at the alternator
and slide the bracket away from the cylinder head. (5) Disconnect the upper radiator hose, coolant
by-pass hose and the heater hose from the thermostat
housing and on 1.6 liter m odels, the coolant hoses
from the inlet manifold. (6) Disconnect the electrica l connectors from the
throttle body, fuel injectors, coil, distributor and on
1.8 liter models, the MAT sensor. (7) Disconnect the oxygen sensor wiring connec-
tor and remove the wiring connectors from the
Page 54 of 238
54 Engine
in the valve stem groove before releasing the spring
compressor. A sharp tap to the top of the valve stem
with a soft faced hammer will ensure that the collets
are correctly seated.
(7) Install the inlet and exhaust manifolds using
new gaskets and tighten the mounting nuts to the
specified torque as previously described. (8) Install a new sealing ring to the
thermostat
housing, install the housing to the cylinder head and
tighten the mounting bolts to the specified torque.
(9) Ensure that the lappet assemblies are filled
with clean engine oil and install the tappets in
their
respective bores in the cylinder head. (10) Install the thrust pads to the top of each
valve
assembly, ensuring that they are returned to their
original locations. (11) Coat the contact surfaces of the rocker arms
with molybdenum disulphide grease and install the
rocker arms to their origin al locations on the cylinder
head. (12) Install the cylinder head to the engine as
previously described.
8. ENGINE SUMP AND OIL PUMP PICKUP . PIPE
TO REMOVE
(1) Disconnect the negative battery terminal.
(2) Raise the front of the vehicle and support it
on chassis stands. Refer to the Wheels and Tires
section for the correct procedure.
(3) Remove the sump plug and drain the engine
oil into a container. Install and tighten the plug
after the oil has been drained.
(4)
Remove the engine pipe as described at the
end of this section.
(5) Remove the nuts and bolts retaining the
engine crossmember to the vehicle underbody and
withdraw the crossmember from the vehicle. On
automatic transaxle models, it will be necessary to
release the selector cable from the crossmember
bracket.
(6) Remove the sump retaining bolts and wash-
ers and if necessary firmly bump the sump with the
palm of the hand and remove it from the engine. (7) Remove the bolts retaining the oil pump
pickup pipe to the oil pump and disconnect the
pickup pipe from the support bracket. Remove the
pickup pipe and discard the O ring seal. (8) Remove the scraper and gasket from the
engine. (9) Clean the gasket material from the sump,
engine block and the scraper.
NOTE: If the scraper assembly is damaged
it should be renewed.
TO INSTAL
(1) Wash the inside of the sump to remove
carbon and sludge deposits. Check for any metal
deposits which may indicate an imminent component
failure. (2) Inspect the sump for dents and cracks.
Ensure that the gasket sea ling face is not distorted or
damaged. (3) Clean the pickup pipe screen with solvent
and a brush. (4) Using a new O ring seal, install the pickup
pipe. Coat the pipe retain ing bolts with Loctite 242
and tighten to the specified torque. (5) Apply a bead of KP510-00150 sealer or
equivalent to the oil pump to cylinder block mating
joint area. (6) Ensure that the sump gasket is correctly
located on the scraper and install the sump to
the
engine. Apply Loctite 242 to the threads of the sump
bolts and tighten the bolts to the specified torque.
(7) Install the front exhaust pipe using a
new
gasket and coat the threads of the flange nuts with an
anti-seize compound before tightening the nuts to the
specified torque. (8) Install the engine crossmember and
tighten
the nuts and bolts securely. If applicable, connect the
automatic transaxle selector cable to the crossmember
bracket. (9) Ensure that the sump drain plug is secure
and lower the vehicle to the ground. (10) Fill the engine with the specified amount and
grade of engine oil. Refer to the Lubrication and
Maintenance section if necessary. (11) Start and run the engine and check for oil
leaks.
View of the sump, oil pump pickup, gasket and scraper
removed from the engine.
Page 55 of 238
Engine 55
9. OIL PUMP
TO REMOVE AND DISMANTLE
(1) Disconnect the negative battery terminal.
(2) Disconnect the lower radiator hose and drain
the cooling system. (3) Raise the front of the vehicle and support it
on chassis stands. Refer to the Wheels and Tires
section if necessary. (4) Remove the right hand front wheel.
(5) Remove the fasteners securing the engine
splash guard to the right hand front inner mudguard
and remove the splash guard. (6) Remove the engine sump and oil pump
pickup pipe as previously described. Remove the oil
filter.
(7) Remove the camshaft timing belt as de-
scribed previously. (8) Disconnect the oil pressure sender electrical
connector. (9) Using a socket and bar, remove the bolt and
spacer retaining the crankshaft timing gear to the
crankshaft. Discard the bolt.
NOTE: It may be necessary to lock the
crankshaft when removing the crankshaft
timing gear retaining bolt. If necessary,
insert a piece of timber between the crank-
case and the crankshaft to prevent the
crankshaft turning.
(10) Remove the crankshaft timing gear from the
crankshaft. It may be necessary to lever the gear from
the crankshaft using two screwdrivers. Remove the
key and spacer from the crankshaft. (11) Remove the camshaft housing top cover.
(12) Using an open ended spanner, hold the
camshaft between the inlet and exhaust lobes of
number four cylinder and remove the camshaft timing
gear retaining bolt and the camshaft timing gear.
(13) Remove the bolts securing the water pump
to the cylinder block and remove the water pump. If
necessary- refer to the Cooling and Heating Systems
section. (14) Remove the camshaft drive belt inner cover
retaining bolts and remove the inner cover. (15) Remove the bolts securing the oil pump to
Dismantled view of the oil pump assembly.
the cylinder block and remove the oil pump from the
engine. Discard the gasket.
(16) Remove the screws retaining the oil pump
cover plate and lift the cover plate from the rear of the
oil pump. (17) Lift the inner and outer rotors from the oil
pump housing. Note that the outer rotor may be
stamped with a mark which must face the cover plate
on assembly. (18) Unscrew the oil pressure relief valve plug
and remove the relief spring and plunger from the oil
pump housing. Discard the sealing washer from the
relief valve plug. (19) If necessary, remove the oil pressure gauge
sender unit.
(20) Remove the crankshaft oil seal from the
pump housing.
TO CHECK AND INSPECT
(1) Wash all the pump components thoroughly
in cleaning solvent and allow to dry.
(2) Inspect the inner and outer rotors and the
cover plate for scoring or wear. Renew the rotors
and/or the cover plate if these faults are evident. (3) Temporarily install the rotors into the oil
pump housing. Check the b acklash between the teeth
of the inner and outer rotors at the point where the
rotor teeth are most closely meshed. If the clearance at
this point exceeds the Specif ications, check the rotors
and housing for wear and renew as necessary. (4) Check the rotor end float by placing a
straight edge across the oil pump housing and measure
the clearance between the straight edge and the rotors
View of the oil pump and associated components.
Page 64 of 238
64 Engine
automatic transaxle models the complete drive plate
must be renewed.
(3) Inspect the drive plate bolt holes for elonga-
tion which is caused by loose retaining bolts.
(4) Inspect the drive plate for cracks.
(5) Repair or renew the flywheel if necessary.
TO INSTAL
Installation is a reversal of the removal procedure
with attention to the following points:
(1) The flywheel and drive plate retaining bolts
are special micro-encapsulated fasteners.
Install new micro-encapsulated bolts of the
correct
strength classification on assembly.
(2) Thoroughly clean the crankshaft threads with
a thread tap. Clean the threads with solvent and dry
before installing the flywh eel or drive plate retaining
bolts.
(3) Tighten the flywheel or drive plate retaining
bolts to the specified torque and on manual transaxle
models, align the clutch plate as described in the
Clutch section.
TO RENEW FLYWHEEL RING GEAR
(1) With the flywheel removed from the vehicle,
drill a 6 mm diameter hole between two teeth of the
ring gear.
NOTE: Do not drill right through the ring
gear as this will damage the flange on the
flywheel.
(2) Secure the flywheel, with the drilled hole
uppermost in a soft jawed vice.
(3) Place a cold chisel above the hole in the ring
gear and hit it sharply to split the ring gear.
(4) Check the direction of the chamfered face of
the old ring gear. The new ring gear must be installed
to the flywheel with the chamfer in the same direction. (5) Remove the ring gear, clean the mounting
face on the flywheel and remove any burrs. (6) Polish a few spots of the ring gear with emery
cloth and heat the ring gear evenly until the polished
spots turn dark blue.
NOTE; Do not heat the ring gear past the
point required to achieve a dark blue color
or the tempering of the ring gear teeth will
be impaired.
(7) With the flywheel suitably supported, pick
the ring gear up using plie rs, and place it evenly onto
the flywheel. Use a hammer and a brass drift to ensure
that the ring gear seats ag ainst the flywheel flange.
NOTE: Allow the ring gear to cool slowly.
Do not quench it in water.
13. ENGINE MOUNTINGS
TO RENEW LEFT HAND SIDE MOUNTING
(1) Disconnect the positive and negative battery
terminals, loosen the battery clamp nuts and withdraw
the battery from the engine compartment.
(2) Remove the bolts retaining the battery car-
rier to the inner mudguard and remove the battery
carrier and associ ated components from the engine
compartment. (3) Support the transaxle using a jack. Interpose
a block of wood between the head of the jack and the
transaxle to prevent damage to the transaxle.
View of the flywheel and retaining bolts.
Dismantled view of the left hand side engine mounting
assembly installed to vehicles with an automatic tran-
saxle.
Page 65 of 238
Engine 65
(4) Hold the nut and remove the mounting
through bolt. (5) Remove the bolts retaining the mounting to
the transaxle and maneuver the mounting from the
engine compartment. (6) If necessary remove the bolts retaining the
support bracket to the inner mudguard and withdraw
the support bracket. Installation is a reversal of the removal procedure
ensuring that the weight of the engine is bearing on
the engine mounting before tightening the through
bolt securely.
TO RENEW RIGHT HAND SIDE MOUNTING
(1) Disconnect the negative battery terminal.
(2) On 1.8 liter models, remove the air cleaner
assembly. Refer to the Fuel and Engine Management
section if necessary. (3) Support the engine under the sump using a
jack. Interpose a block of wood between the head of
the jack and the sump to prevent damage.
(4) Hold the nut and remove the mounting
through bolt and rubber. (5) Remove the bolts retain ing the mounting to
the inner mudguard and maneuver the mounting
from the engine compartment. (6) If necessary, remove the nuts and bolts
retaining the support brackets to the engine assembly
and withdraw the support brackets.
Installation is a reversal of the removal procedure
ensuring that the weight of the engine is bearing on
the engine mounting before tightening the through
bolt securely.
TO RENEW FRONT TORQUE DAMPER
(1) Raise the front of the vehicle, remove the
splash guard fasteners and remove the splash guard(s)
from the front of the vehicle.
(2) Remove the through bolts and nuts from the
torque damper.
NOTE: It may be necessary to unclip the
wiring harness from the lower radiator sup-
port panel to gain access to the front through
bolt.
Dismantled view of the front torque damper. The arrow of the engine bracket must face upwards.
(3) Withdraw the torque damper from the
engine.
(4) If necessary the support brackets can be
removed. Installation is a reversal of the removal procedure
ensuring that the arrow on the engine bracket faces
upwards.
TO RENEW REAR ENGINE MOUNTING AND
TORQUE DAMPER
Automatic and manual transaxle models both use
a similar rear engine moun ting with different support
brackets. Manual transaxle models use a rear torque
damper.
(1) Raise the front of the vehicle and support it
on chassis stands. (2) Remove the stabilizer bar mounting bracket
bolts and allow the rear of the stabilizer bar to hang
down slightly. (3) Remove the nuts and bolts retaining the
engine crossmember to the vehicle underbody and
withdraw the crossmember from the vehicle.
Dismantled view of the right hand side engine mount-
ing assembly.
Page 70 of 238
70 Cooling and Heating Systems
Installed view of the heater hoses. 1.6 liter models with the air cleaner removed for clarity
.
When the engine is at normal operating
temperature and the heater valve is open,
both of the heater hoses should feel
warm/hot. If the valve is not allowing the
coolant to flow, one hose will be hot while
the other will be cold.
NO COOLED AIR INSIDE VEHICLE
(1) Compressor drive belt slipping or broken:
Renew and/or adjust the drive belt as described in the
Engine Tune-up section.
(2) Insufficient refrigerant: Check the system for
leaks and charge as necessary. Refer to the Air
Conditioning heading in th is section for information
on checking the refrigerant level. (3) Compressor inoperative: Check for power to
the compressor clutch before removing the compres-
sor for repair by a specialist. (4) Heater system allowing warm air to mix with
cooled air: Check the operation of the heater system.
NOTE: The above trouble shooting proce-
dures are basic checks only. If the air
conditioning system is suspect, it is rec-
ommended that the vehicle be taken to an
authorized dealer for testing and repair.
It is normal for water to be seen drain-
ing under the vehicle from the evaporator
after the vehicle has been operated with
the air conditioning on.
3. DESCRIPTION
The cooling system is of the sealed, pressurized
type with fan and water pump assistance. The system
is pressurized in order to raise the boiling point of the
coolant and so increase the efficiency of the engine.
Provision for pressure a nd vacuum relief of the
system is incorporated in the radiator cap.
The radiator overflow hose is connected to a
reserve tank mounted adjacent to the battery. As the
coolant volume expands due to an increase in tem-
perature, the pressure valve in the radiator cap opens
and allows the excess coolant to flow into the reserve
tank. When the engine is stopped and the temperature
of the coolant falls, the vacuum valve in the radiator
cap opens and allows the excess coolant in the reserve
tank to siphon back into the radiator. Thus the
necessity for frequent topping up of the coolant is
eliminated.
The temperature of the cooling system is con-
trolled by a thermostat located in the thermostat
housing attached to the cylinder head.
The thermostat prevents circulation of coolant
through the radiator by directing coolant through the
by-pass circuit, until the engine has reached operating
temperature. This restricted circulation allows the
engine to reach operating temperature quickly, im-
proving drivability and fuel economy.
Removal of the thermostat to cure overheating is
not recommended because th e by-pass circuit will
remain open reducing the amount of water flowing
through the radiator.
An anti-corrosion inhibitor should always be
added to the coolant to protect the cooling and
heating systems from corrosion.
The water pump is mounted to the front of the
engine and is driven by the camshaft drive belt. It is
equipped with a double row ball bearing and a spring
loaded seal assembly. The water pump is a disposable
unit and cannot be repaired.
The fan is driven by an electric motor which is
actuated by the coolant temperature sensor and the
control unit.
On vehicles equipped with air conditioning, an
additional electric fan is m ounted to the radiator. This
fan is controlled by a sw itch connected to the air
conditioning compressor.
The radiator consists of an aluminum core with
plastic side tanks. Minor damage to the core can be
repaired using Nissan repair agent.
The left hand tank of the radiator houses the
transaxle oil cooler on automatic transaxle models.
To drain the cooling system a drain plug is
provided on the lower radiator pipe outlet.
4. RADIATOR
NOTE: To avoid scalding, use caution when
releasing the radiator cap on an engine
which is at the normal operating tempera-
ture. Turn the cap anti-clockwise to the first
stop and allow any pressure in the system to
release. When the pressure is released turn
the cap past the stop and remove it from the
radiator.
Page 73 of 238
Cooling and Heating Systems 73
(1) Renew all hoses that show signs of cracking
or perishing.
(2) Before finally tightening the hose clips, en-
sure that the hoses are push ed fully onto the radiator
and are not kinked. (3) On automatic transaxle models, ensure that
the oil cooler hoses are correctly installed to the
radiator and show no signs of leakage. Check and top
up the automatic transaxle fluid as necessary.
5. COOLING FAN
The radiator cooling fan is controlled by the
electronic control unit, and on vehicles with air
conditioning, the condenser fan relay. On vehicles
with air conditioning there are two cooling fans, one
is larger than the other. The large fan is for the
radiator and the smaller fan provides extra cooling
when the air conditioning is activated. Each fan is
controlled by a separate system.
TO TEST COOLING FAN AND SYSTEM
(1) With the cooling system cold and the air
conditioning, if applicable, switched off, switch the
ignition On and confirm that the cooling fan is
stationary.
NOTE: Leave the ignition On for all tests
unless otherwise stated.
(2) In the above test, if the cooling fan rotates,
proceed as follows:
(a) Disconnect the cooling fan relay from the
rear of the engine compartment relay box.
(b) If the fan stops, backprobe terminal C1 at
the electronic control unit using an LED test lamp
connected to the positive battery terminal. If no
circuit exists, renew the cooling fan relay.
View showing the location of the diagnostic link
connector. Passengers seat removed for clarity.
If a circuit exists, check the wiring harness
between the electronic control unit and the relay for
short circuits to earth and repair if necessary. If no
short circuit is present renew the electronic control
unit.
Schematic layout of the cooling fan, coolant temper-
ature sensor and related electrical components.
Installed view of the engine compartment relays. KEY
1. To Battery
2. Fusible link
COLOUR CODE
3. Fusible link
B-Black
4. Fusible linkL- Blue
5. I
gnition relayY- Yellow
6. Fuse 20 am
pW-White
7. Coolin
g fan relayO-Orange
8. Coolin
g fan
9. Coolant tem
perature
sensor
10. To air conditionin
g
fan rela
y
11. To throttle
position
sensor
12. Control unit