engine NISSAN PICK-UP 1998 Repair Manual

Changing Engine Coolant
WARNING:
To avoid being scalded, never change the coolant when the
engine is hot.
Ð DRAINING ENGINE COOLANT Ð
1. Move heater ``TEMP'' control lever all the way to ``HOT''
position.
lMake sure that air condition switch is ``OFF''.
2. Open radiator drain plug at the bottom of radiator, and
remove radiator cap.
3. Remove reservoir tank, drain coolant, then clean reservoir
tank. Install it temporarily.
Be careful not to allow coolant to contact drive belts.
4. Remove cylinder block drain plug.
Ð FLUSHING COOLING SYSTEM Ð
5. Install and then tighten radiator drain plug and cylinder block
drain plug securely.
6. Open air relief plug.
7. Fill radiator with water and close air relief plug and radiator
cap.
8. Run engine and warm it up sufficiently.
9. Race engine 2 or 3 times under no-load.
10. Stop engine and wait until it cools down.
11. Repeat step 2 through step 10 until clear water begins to
drain from radiator.
12. Drain water.
Ð REFILLING ENGINE COOLANT Ð
lApply sealant to the thread of drain plug.
: 34-44Nzm
(3.5 - 4.5 kg-m, 25 - 33 ft-lb)
SMA917C
SMA918CA
SMA919C
SMA580C
ENGINE MAINTENANCEKA
MA-16

13. Open radiator cap and air relief plug.
14. Fill radiator with coolant up to specified level.
Follow instructions attached to anti-freeze container for mix-
ing ratio of anti-freeze to water.
For coolant mixture ratio, refer to MA-14.
Unit:!(Imp qt)
Coolant capacity:
2WD 4WD
Without reservoir tank 6.1 (5-3/8)
Reservoir tank 0.6 (1/2)
Pour coolant through coolant filler neck slowly to allow air
in system to escape.
15. Close air relief plug.
16. Remove reservoir tank, drain coolant, then clean reservoir
tank.
17. Install reservoir tank and fill it with coolant up to ``MAX'' level
and then install radiator cap.
18. Run engine and warm it up sufficiently.
19. Race engine 2 or 3 times under no-load.
20. Stop engine and cool it down, then add coolant as neces-
sary.
Checking Cooling System
CHECKING HOSES
Check hoses for proper attachment, leaks, cracks, damage,
loose connections, chafing and deterioration.
CHECKING RADIATOR CAP
Apply pressure to radiator cap by means of a cap tester to see
if it is satisfactory.
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)
Pull the negative-pressure valve to open it. Check that it closes
completely when released.
SMA182B
SMA920C
SLC769A
SMA871B
ENGINE MAINTENANCEKA
Changing Engine Coolant (Cont'd)
MA-17

CHECKING COOLING SYSTEM FOR LEAKS
Apply pressure to the cooling system with cap tester to check for
leakage.
Testing pressure:
157 kPa (1.57 bar, 1.6 kg/cm
2, 23 psi)
CAUTION:
Higher pressure than the specified value may cause damage
to the radiator.
Checking Fuel Lines
Inspect fuel lines and tank for improper attachment and for leaks,
cracks, damage, loose connections, chafing and deterioration.
If necessary, repair or replace malfunctioning parts.
CAUTION:
Tighten high-pressure rubber hose clamp so that clamp end
is 3 mm (0.12 in) from hose end.
Tightening torque specifications are the same for all rubber
hose clamps.
Ensure that screw does not contact adjacent parts.
Changing Fuel Filter
WARNING:
Before removing fuel filter, release fuel pressure from fuel
line.
1. Remove fuse for fuel pump.
2. Start engine.
3. After engine stalls, crank engine two or three times to make
sure that fuel pressure is released.
4. Turn ignition switch OFF and install fuse for fuel pump.
5. Loosen fuel hose clamps.
6. Replace fuel filter.
lBe careful not to spill fuel or engine compartment. Place
a shop towel to absorb fuel.
lUse a high-pressure type fuel filter. Do not use a syn-
thetic resinous fuel filter.
lWhen tightening fuel hose clamps, refer to ``Checking
Fuel Lines'', MA-18.
SMA990A
SMA215C
MMA104A
SMA921C
SMA922C
ENGINE MAINTENANCEKA
Checking Cooling System (Cont'd)
MA-18

Changing Air Cleaner Filter (Viscous paper
type)
The viscous paper type filter does not need cleaning
between renewals.
Changing Engine Oil
WARNING:
lBe careful not to burn yourself, as the engine oil is hot.
lProlonged and repeated contact with used engine oil
may cause skin cancer; try to avoid direct skin contact
with used oil. If skin contact is made, wash thoroughly
with soap or hand cleaner as soon as possible.
1. Warm up engine, and check for oil leakage from engine com-
ponents.
2. Remove drain plug and oil filler cap.
3. Drain oil and refill with new engine oil.
Oil grade: API, SG or SH
Viscosity: See ``RECOMMENDED FLUIDS AND
LUBRICANTS'', MA-13.
Refill oil capacity (Approximately):
Unit:!(Imp qt)
2WD 4WD
With oil filter change 3.9 (3-3/8) 4.1 (3-5/8)
Without oil filter change 3.5 (3-1/8) 3.7 (3-1/4)
CAUTION:
lBe sure to clean drain plug and install with new washer.
Drain plug:
: 29 - 39 N´m (3.0 - 4.0 kg-m, 22 - 29 ft-lb)
lUse recommended engine oil.
lThe refill capacity changes depending on the oil tem-
perature and drain time, use these values as a reference
and be certain to check with the dipstick when changing
the oil.
4. Check oil level.
5. Start engine and check area around drain plug and oil filter
for oil leakage.
6. Run engine for a few minutes, then turn it off. After several
minutes, check oil level.
SMA925C
SMA923C
SMA885B
ENGINE MAINTENANCEKA
MA-19

Changing Oil Filter
1. Remove oil filter with a suitable tool.
WARNING:
Be careful not to burn yourself, as the engine and the engine
oil are hot.
2. Before installing a new oil filter, clean the oil filter mounting
surface on cylinder block, and coat the rubber seal of oil fil-
ter with a little engine oil.
3. Screw in the oil filter until a slight resistance is felt, then
tighten additionally more than 2/3 turn.
4. Add engine oil.
Refer to ``Changing Engine Oil'', MA-19.
Checking and Changing Spark Plugs
1. Disconnect ignition wires from spark plugs at boot.
Do not pull on the wire.
2. Remove spark plugs with spark plug wrench.
3. Clean plugs in sand blast cleaner.
4. Check insulator for cracks or chips, gasket for damage or
deterioration and electrode for wear and burning. If they are
excessively worn away, replace with new spark plugs.
Spark plug:
Make NGK
Standard type ZFR5E-11
Hot type ZFR4E-11
Cold type ZFR6E-11
SMA946C
SMA010
SMA229B
SMA017-A
SMA581C
ENGINE MAINTENANCEKA
MA-20

Use standard type spark plug for normal condition.
The hot type spark plug is suitable when fouling occurs with the
standard type spark plug under conditions such as:
lfrequent engine starts
llow ambient temperatures
The cold type spark plug is suitable when spark knock occurs
with the standard type spark plug under conditions such as:
lextended highway driving
lfrequent high engine revolution
5. Check spark plug gap.
Gap: 1.0 - 1.1 mm (0.039 - 0.043 in)
6. Install spark plugs. Reconnect ignition wires according to
numbers indicated on them.
Spark plug:
: 20-29N´m
(2.0 - 3.0 kg-m, 14 - 22 ft-lb)
Checking Ignition Wires
1. Check the high tension wires for cracks, damage, burned
terminals and for proper fit.
2. Measure the resistance of the high tension wires, by shak-
ing them and checking for intermittent breaks.
Resistance: Less than 12.2 kW/m (3.72 kW/ft)
Checking Positive Crankcase Ventilation
(PCV) System
CHECKING PCV VALVE
With engine running at idle, remove ventilation hose from PCV
valve; if valve is working properly, a hissing noise will be heard
as air passes through it and a strong vacuum should be felt
immediately when a finger is placed over valve inlet.
CHECKING VENTILATION HOSES
1. Check hoses and hose connections for leaks.
2. Disconnect all hoses and clean with compressed air. If any
hose cannot be freed of obstructions, replace.
Changing Positive Crankcase Ventilation
(PCV) Filter
Remove air cleaner cover and take out PCV filter located inside
air cleaner cover. Then install new PCV filter.
SMA476
SMA015A
SMA048
SMA587C
ENGINE MAINTENANCEKA
Checking and Changing Spark Plugs
(Cont'd)
MA-21

Checking Vacuum Hoses and Connections
Check vacuum hoses for improper attachment and for leaks,
cracks, damage, loose connections, chafing and deterioration.
Refer to Vacuum Hose Drawing in ENGINE AND EMISSION
CONTROL OVERALL SYSTEM in EC section.
Checking Vapor Lines
1. Visually inspect vapor lines for improper attachment and for
cracks, damage, loose connections, chafing and deteriora-
tion.
2. Inspect vacuum relief valve of fuel tank filler cap for clogging,
sticking, etc.
Refer to EVAPORATIVE EMISSION CONTROL SYSTEM
INSPECTION in EC section.
Checking Heated Oxygen Sensor
Checking procedure
INSPECTION START
Start engine and warm it up until engine
coolant temperature indicator points to the
middle of gauge.
b
Run engine at about 2,000 rpm for about
2 minutes under no-load.
*Make sure that inspection lamp (Green
LED) on ECM goes on and off more than
5 times during 10 seconds, at 2,000 rpm
under no-load.
OK NG
.
.
Check and adjustment should be made
by referring to IDLE SPEED/IGNITION
TIMING/IDLE MIXTURE RATIO INSPEC-
TION in EC section.
INSPECTION END
*lMake sure that diagnostic mode is mode I or mode II.lMake sure that diagnostic mode selector is turned fully counterclockwise.
Refer to Self-diagnosis in EC section.
SMA924C
SMA406B
SEF292H
.
.
.
ENGINE MAINTENANCEKA
MA-22

Checking Manifold Tightening Torque
Checking should be performed while engine is cold
[approximately 20ÉC (68ÉF)].
Manifold bolts and nuts:
Intake
: 13 - 19 N´m (1.3 - 1.9 kg-m,9-14ft-lb)
Exhaust
: 25 - 29 N´m (2.5 - 3.0 kg-m, 18 - 22 ft-lb)
Exhaust tube nuts:
: 41.2 - 48.0 N´m (4.2 - 4.9 kg-m, 30 - 35 ft-lb)
Adjusting Intake and Exhaust Valve
Clearance
Adjustment should be made while engine is warm but not
running.
1. Set No. 1 cylinder in top dead center on its compression
stroke, and adjust valve clearance
V1,V2,V3andV6.
2. Set No. 4 cylinder at top dead center on its compression
stroke, and adjust valve clearance
V4,V5,V7andV8.
Valve clearance:
Intake
V1,V3,V5andV7
0.30 - 0.40 mm (0.012 - 0.016 in)
Exhaust
V2,V4,V6andV8
0.30 - 0.40 mm (0.012 - 0.016 in)
Adjusting screw lock nuts:
: 15 - 20 N´m (1.5 - 2.0 kg-m, 11 - 14 ft-lb)
lTighten lock nuts, by fixing the adjusting screws using a
minus driver.
Checking Drive Belt
1. Inspect for cracks, fraying, wear or oil adhesion. Replace if
necessary.
The belts should not touch the bottom of the pulley groove.
2. Check drive belt deflection by pushing on the belt midway
between pulleys.
Adjust if belt deflections exceed the limit.
Unit: mm (in)
Used belt deflection
Deflection of new belt
LimitDeflection after
adjustment
Alternator 20 (0.79) 11 - 13 (0.43 - 0.51) 9 - 11 (0.35 - 0.43)
Air conditioner
compressor12 (0.47) 6 - 7.5 (0.236 - 0.295) 5 - 6.5 (0.197 - 0.256)
Power steering oil
pump15 (0.59) 8 - 9.5 (0.315 - 0.374) 7 - 8.5 (0.276 - 0.335)
Applied pushing
force98 N (10 kg, 22 lb)
Check drive belt deflections when engine is cold.
SMA653C
SMA613C
ENGINE MAINTENANCETD
MA-23

Changing Engine Oil
WARNING:
lBe careful not to burn yourself, as engine oil is hot.
lProlonged and repeated contact with used engine oil
may cause skin cancer; try to avoid direct skin contact
with used oil. If skin contact is made, wash thoroughly
with soap or hand cleaner as soon as possible.
1. Warm up engine, and check for oil leakage from engine com-
ponents.
2. Remove oil filler cap and drain plug.
3. Drain oil and fill with new engine oil.
Oil grade: API CC or CD except Europe
API, CD for Europe
Viscosity:
See ``RECOMMENDED FLUIDS AND
LUBRICANTS'', MA-13.
Refill oil capacity (approximate):
Without oil filter change
TD25 6.5!(5-3/4 Imp qt)
With oil filter change
TD25 7.2!(6-3/8 Imp qt)
CAUTION:
lBe sure to clean and install oil pan drain plug with
washer.
Drain plug:
: 54 - 59 N´m (5.5 - 6.0 kg-m, 40 - 43 ft-lb)
lThe refill capacity changes depending on the oil tem-
perature and drain time; use these valves as a reference
and be certain to check with the dipstick when changing
the oil.
4. Check oil level.
5. Start engine. Check area around drain plug and oil filter for
any sign of oil leakage.
6. Run engine for a few minutes, then turn it off. After several
minutes check oil level.
Changing Engine Oil Filter
1. Remove oil filter with Tool.
WARNING:
Be careful not to burn yourself, as the engine and engine oil
are hot.
DMA002
DMA003-N
.
DMA004
DMA008-A
ENGINE MAINTENANCETD
MA-24

2. Clean oil filter mounting surface on cylinder block. Coat rub-
ber seal of new oil filter with engine oil.
3. Screw in the oil filter until a slight resistance is felt, then
tighten an additional 2/3 of a turn.
4. Add engine oil.
Refer to Changing Engine Oil.
lClean excess oil from engine.
Changing Engine Coolant
WARNING:
To avoid the danger of being scalded, never change the
coolant when the engine is hot.
ÐDRAINING ENGINE COOLANTÐ
1. Move heater TEMP control knob all the way to HOT.
2. Open radiator drain plug at the bottom of radiator.
3. Remove radiator filler cap.
Remove reservoir tank, drain coolant, then clean reservoir
tank.
Install it temporarily.
lBe careful not to allow coolant to contact drive belts.
4. Remove cylinder block drain plug located at left rear of cyl-
inder block.
5. Drain coolant and install cylinder block drain plug and radia-
tor drain plug.
6. Fill radiator with water and warm up engine.
7. Stop engine and wait until it cools down.
8. Repeat step 2 through step 7 two or three times.
9. Drain water.
ÐREFILLING ENGINE COOLANTÐ
10. Install reservoir tank, radiator drain plug, and cylinder block
drain plugs.
lApply sealant to the thread of cylinder block drain plug.
Cylinder block drain plug:
: 54 - 64 N´m (5.5 - 6.5 kg-m, 40 - 47 ft-lb)
11. Fill radiator and reservoir tank with coolant up to the MAX
level and install radiator cap.
For coolant mixture ratio, refer to MA-14.
SMA010
DMA009
SMA617C
SMA182B
ENGINE MAINTENANCETD
Changing Engine Oil Filter (Cont'd)
MA-25