NISSAN PRIMERA 1999 Electronic Repair Manual

Oil Pressure Check
WARNING:

Be careful not to burn yourself, as the engine and oil may
be hot.

Oil pressure check should be done in“Neutral position”.
1. Check oil level.
2. Remove oil pressure switch.
3. Install pressure gauge.
4. Start engine and warm it up to normal operating temperature.
5. Check oil pressure with engine running under no-load.
Engine speed
rpmApproximate discharge pressure
kPa (bar, kg/cm2, psi)
Idle speedMore than 78 (0.78, 0.8, 11)
3,200314 - 392 (3.14 - 3.92, 3.2 - 4.0, 46 - 57)
If difference is extreme, check oil passage and oil pump for oil
leaks.
6. Install oil pressure switch with sealant.
.Oil pressure
switch
.Oil cooler.NLC045
.SR20DE models
.SLC717A
ENGINE LUBRICATION SYSTEMSR20DE
Oil Pressure Check
LC-16

Oil Pump
REMOVAL AND INSTALLATION
1. Drain engine oil
2. Remove drive belts.
3. Remove cylinder head. (Refer to EM section).
4. Remove oil pan. (Refer to EM section).
5. Remove oil strainer and baffle plate.
6. Remove front cover assembly.
7. Install front cover assembly.
8. Reinstall any parts removed in reverse order of removal
DISASSEMBLY AND ASSEMBLY
1Oil pump cover
2Front cover
3Inner gear
4Outer gear
5Regulator valve
6Spring
7Plug
8Regulator valve set
9Oil strainer

Always replace oil seal, gasket and O-ring with new ones.

When installing oil pump, apply engine oil to inner and
outer gears.

Be sure that O-rings are properly fitted.
NLC050
Gasket
3.7 - 5.0 (0.38 - 0.51, 32.7 - 44.3)
6.3 - 8.3 (0.64 - 0.85, 55.8 - 73.5)
16 - 19 (1.6 - 1.9, 12 - 14)
50 - 70 (5.1 - 7.1, 37 - 51) :N·m (kg-m, ft-lb)
:N·m (kg-m, in-lb)
: Apply engine oil.
: Apply liquid gasket.
SEC. 135⋅150
.
ENGINE LUBRICATION SYSTEMSR20DE
Oil Pump
LC-17

INSPECTION
Using a feeler gauge, check the following clearances:
Unit: mm (in)
Body to outer gear clearance (radial)10.114 - 0.200 (0.0045 - 0.0079)
Inner gear to outer gear tip clearance
2Below 0.18 (0.0071)
Body to inner gear clearance
30.05 - 0.09 (0.0020 - 0.0035)
Body to outer gear clearance (axial)
40.05 - 0.11 (0.0020 - 0.0043)
Inner gear to brazed portion of housing clear-
ance
5
0.045 - 0.091 (0.0018 - 0.0036)

If the tip clearance (2) exceeds the limit, replace gear
set.

If body to gear clearances (
1,3,4,5) exceed the
limit, replace front cover assembly.
SLC860A
Feeler gauge
Front cover
Front
cover
Inner gearStraightedge
Feeler
gauge
SLC494A
SLC495A
SLC450A
ENGINE LUBRICATION SYSTEMSR20DE
Oil Pump (Cont’d)
LC-18

REGULATOR VALVE INSPECTION
1. Visually inspect components for wear and damage.
2. Check oil pressure regulator valve sliding surface and valve
spring.
3. Coat regulator valve with engine oil. Check that regulator valve
falls smoothly into the valve hole by its own weight.
If damaged, replace regulator valve set or oil pump cover.
4. Check regulator valve to oil pump cover clearance.
Clearance:
6: 0.040 - 0.097 mm (0.0016 - 0.0038 in)
If it exceeds the limit, replace oil pump cover.
Oil Filter
The oil filter is a small, full-flow cartridge type and is provided with
a relief valve.

The new and existing oil filter designs differ from each
other and are not interchangeable.

Use Tool KV10115801 or KV10115800 for removing oil fil-
ter.
SLC986AA Spring
Regulator valveWasher
Cap
SLC451A Oil pump cover
Regulator valve
NLC046 Oil filter body
Relief valve
Filtering paper
Thread
Gasket
ENGINE LUBRICATION SYSTEMSR20DE
Oil Pump (Cont’d)
LC-19

Oil Cooler
REMOVAL AND INSTALLATION
1. Drain engine oil and coolant.
2. Remove oil cooler.
3. Installation is in reverse order of removal

Be careful not to burn yourself as engine oil is hot

After installation, run engine for a few minutes and check
for oil leaks.

Do not spill coolant on drive belts.
INSPECTION
1. Check oil cooler for cracks.
2. Check oil cooler for clogging by blowing through coolant inlet.
If necessary, replace oil cooler assembly.
NLC047 Gasket
Oil cooler
Coolant
flow
O-ring
34 - 44 N·m (3.5 - 4.5 kg-m, 25 - 33 ft-lb)Oil cooler assemblyOil filter
Oil pressure switch
13 - 17 N·m
(1.3 - 1.7 kg-m, 9 - 12 ft-lb)
SEC. 213
: Locking sealant.
:N·m (kg-m, ft-lb)
: Do not re-use
.
ENGINE LUBRICATION SYSTEMSR20DE
Oil Cooler
LC-20

Cooling Circuit
System Check
WARNING:
Never remove the radiator cap when the engine is hot; serious
burns could be caused by high pressure fluid escaping from
the radiator.
Wrap a thick cloth around the cap and carefully remove it by
turning it a quarter turn to allow built-up pressure to escape
and then turn the cap all the way off.
Cooling System Inspection
CHECKING HOSES
Check water hoses for proper attachment, leaks, cracks, damage,
loose connections, chafing and deterioration.
CHECKING RADIATOR CAP
To check radiator cap, apply pressure to cap with a tester.
Radiator cap relief pressure:
Standard
78-98kPa
(0.78 - 0.98 bar, 0.8 - 1.0 kg/cm
2, 11 - 14 psi)
Limit
59-98kPa
(0.59 - 0.98 bar, 0.6 - 1.0 kg/cm
2,9-14psi)
YLC029
SLC613-A
ENGINE COOLING SYSTEMSR20DE
Cooling Circuit
LC-21

Pull the negative pressure valve to open it.
Check that it closes completely when released.
CHECKING COOLING SYSTEM FOR LEAKS
To check for leakage, apply pressure to the cooling system with a
tester.
Testing pressure:
157 kPa (1.57 bar, 1.6 kg/cm
2, 23 psi)
CAUTION:
Higher than the specified pressure may cause radiator dam-
age.
Water Pump
REMOVAL AND INSTALLATION
1. Drain coolant from radiator.
2. Remove cylinder block drain plug located at left front of cylin-
der block and drain coolant.
3. Remove front RH wheel and engine side cover.
4. Remove drive belts.
5. Remove front engine mounting.
6. Remove water pump.
CAUTION:

When removing water pump assembly, be careful not to
get coolant on drive belt.

Water pump cannot be disassembled and should be
replaced as a unit.

After installing water pump, connect hose and clamp
securely, then check for leaks using radiator cap tester.
7. Before installing, remove all traces of liquid gasket from mat-
ing surface of water pump using a scraper.

Also remove traces of liquid gasket from mating surface
of cylinder block.
SMA967B
.SLC546AA Hose adapter
.SLC557AA Drain plug
8-12N·m
(0.8 - 1.2 kg-m,
69 - 104 in-lb)
Oil level gauge guide
SLC556AA
Liquid
gasket
Water pump
16 - 21 N·m
(1.6 - 2.1 kg-m,
12 - 15 ft-lb)
SEC. 210
SLC433A
ENGINE COOLING SYSTEMSR20DE
Cooling System Inspection (Cont’d)
LC-22

8. Apply a continuous bead of liquid gasket to mating surface of
water pump.

Use Genuine Liquid Gasket or equivalent.
9. Install any parts removed in reverse order of removal
INSPECTION
1. Check body assembly for rust or corrosion.
2. Check for rough operation due to excessive end play.
Thermostat
SLC434A
Liquid gasket
2.0 - 3.0 mm
(0.079 - 0.118 in)
SLC408C
SLC050B
SEC. 210
6.3 - 8.3
(0.64 - 0.85, 55.8 - 73.5)
6.3 - 8.3 (0.64 - 0.85, 55.8 - 73.5)
Air relief plug
(if so equipped)Thermostat
housing16 - 21 (1.6 - 2.1, 12 - 15)
Water inlet
16 - 21
(1.6 - 2.1,
12 - 15)
16 - 21 (1.6 - 2.1, 12 - 15)
2.0 - 3.0 mm
(0.079 - 0.118 in)
2.0 - 3.0 mm
(0.079 - 0.118 in)
:N·m (kg-m, ft-lb)
:N·m (kg-m, in-lb)
: Apply liquid gasketThermostat
.
ENGINE COOLING SYSTEMSR20DE
Water Pump (Cont’d)
LC-23

REMOVAL AND INSTALLATION
1. Remove lower radiator hose and drain engine coolant.
2. Remove water inlet, then take out thermostat.
3. Before installing, remove all traces of liquid gasket from mat-
ing surface of each part using a scraper.
4. Apply a continuous bead of liquid gasket to mating surface of
each part.

Use Genuine Liquid Gasket or equivalent.
5. Install thermostat with jiggle valve or air bleeder facing upward.

After installation, run engine for a few minutes, and check
for leaks.

Be careful not to spill coolant over engine compartment.
Use a rag to absorb coolant.
INSPECTION
1. Check valve seating condition at ordinary temperatures. It
should seat tightly.
2. Check valve opening temperature and valve lift.
Valve opening temperature°C(°F) 82 (180)
Valve lift mm/°C (in/°F)More than 9/95 (0.35/203)
3. Then check if valve closes at 5°C (41°F) below valve opening
temperature.
SLC767 Upper
Jiggle valve
SLC343
ENGINE COOLING SYSTEMSR20DE
Thermostat (Cont’d)
LC-24

Radiator
1Reservoir tank
2Reservoir tank hose
3Radiator cap
4Mounting bracket
5Upper hose
6Mounting rubber
7Oil cooler hose (A/T models)
8Radiator
9Lower hose
10Cooling fan
11Cooling fan motor
12Cooling fan motor shield
Cooling fan control system

Cooling fans are controlled by the ECM. For details, refer to
EC-section (“COOLING SYSTEM”,“Diagnostic Procedure”,
EC-SR-284).
Refilling engine coolant

For details on refilling engine coolant, refer to MA section
(“ENGINE MAINTENANCE”,“Changing Engine Coolant”,
MA-41).
NLC090
3.8 - 4.5
(0.39 - 0.46,
33.9 - 39.9)
3.7 - 5.0 (0.38 - 0.51, 32.7 - 44.3)
4.0 - 4.5
(0.41 - 0.46,
35.4 - 39.8)
3.25 - 4.25
(0.33 - 0.43,
28.8 - 37.6)
1
2
34
5
6
7
8
9
10
11
11
10
7
SEC. 214
12
N·m (kg-m, in-lb)
ENGINE COOLING SYSTEMSR20DE
Radiator
LC-25