cooling NISSAN PICK-UP 1998 Manual PDF

Removal
1. Drain coolant from engine block and radiator. Refer to MA
section (``Changing Engine Coolant'', ``ENGINE MAINTE-
NANCE'').
2. Release fuel pressure. Refer to EC section (``Fuel Pressure
Release'').
3. Remove negative battery cable.
4. Remove hood. Refer to BT section.
5. Remove power steering drive belt, alternator drive belt and
A/C compressor drive belt.
6. Remove radiator. Refer to LC section (``Radiator'', ``ENGINE
COOLING SYSTEM'').
7. Remove exhaust manifold heat shield.
8. Disconnect exhaust system from exhaust manifold.
9. Discharge refrigerant. Refer to HA section (``R-134a Service
Procedure'', ``SERVICE PROCEDURES'').
10. Disconnect refrigerant lines. Refer to HA section (``Refriger-
ant Lines'', ``SERVICE PROCEDURES'').
11. Disconnect accelerator wire, vacuum hoses, electrical
connectors, heater hoses and vacuum booster hose.
12. Remove four power steering pump bolts.
13. Remove transmission. Refer to MT section (``Removal'',
``REMOVAL AND INSTALLATION'').
14. Remove LH and RH engine mounts.
15. Remove engine.
Installation
lInstall in reverse order of removal.
SEM602F
SEM603F
SEM604F
ENGINE REMOVALKA
EM-37

Removal
Removal order and pointsApplied model
2WD 4WD
1 Remove undercover.jj
2 Drain engine oil.jj
3Remove front propeller shaft
from front differential carrier.Ðj
4Remove front drive shaft fix-
ing bolts (RH & LH).Ðj
5Remove front suspension
crossmember.jj
6Remove differential front
mounting bolts (RH & LH)
and rear mounting bolts.Ðj
7Remove front differential car-
rier.ÐjRemoval order and pointsApplied model
2WD 4WD
8Remove front differential car-
rier mounting bracket.Ðj
9Remove transmission to rear
engine mounting bracket
nuts (RH & LH).jj
10Remove engine mounting
bolts or nuts (RH & LH).jj
11Lift up engine.
If necessary, disconnect
exhaust tube.jj
12 Remove oil pan.jj
WARNING:
lPlace vehicle on a flat and solid surface.
lPlace chocks at front and rear of rear wheels.
lYou should not remove oil pan until exhaust system and
cooling system have completely cooled off.
Otherwise, you may burn yourself and/or fire may break
out in the fuel line.
lWhen removing front and/or rear engine mounting bolts
or nuts, lift up slightly engine for safety work.
CAUTION:
lIn lifting engine, be careful not to hit against adjacent
parts, especially against accelerator wire casing end,
brake tube and brake master cylinder.
lFor tightening torque, refer to EM-71, MT and PD sec-
tions.
Remove oil pan bolts in order shown.
Installation
1. Install the oil pan gasket with the coated surface facing the
cylinder block and the notch facing the rear of the engine.
2. Tighten all bolts in reverse order of removal. For tightening
torque of oil pan and correct installing direction of drain plug
washer, refer to EM-71.
DEM022
DEM023
OIL PANTD
EM-52

OIL SEAL INSTALLING DIRECTION
lWhen installing a new front or rear seal, make sure its mount-
ing direction is correct.
CRANKSHAFT FRONT OIL SEAL
1. Remove radiator shroud.
2. Remove cooling fan.
3. Remove drive belts.
4. Remove crankshaft pulley.
5. Remove crankshaft oil seal.
lBe careful not to damage sealing surfaces of crankshaft.
6. Coat new oil seal with engine oil and install it in place.
lPress the oil seal until it contacts with the front cover.
CRANKSHAFT REAR OIL SEAL
1. Dismount transmission.
2. Remove clutch cover assembly.
3. Remove flywheel and rear plate.
4. Remove oil pan and oil pan gasket.
5. Remove oil seal retainer assembly and retainer gasket.
lReplace oil seal and retainer assembly as a single unit
(mono-block type combined with oil seal).
6. Coat oil seal with engine oil and install new oil seal retainer
assembly in place.
VALVE STEM OIL SEAL
1. Remove following parts.
lThrottle chamber and air intake tube
SEM715A
SEM644B
DEM042
MEM182A
DEM108
.
OIL SEAL REPLACEMENTTD
EM-67

Removal
1. Remove engine undercover and hood.
2. Drain engine coolant.
3. Remove vacuum hoses, fuel tubes, wires, harnesses and
connectors and so on.
4. Remove radiator, shroud and cooling fan.
5. Remove drive belts.
6. Remove power steering oil pump and air conditioner com-
pressor.
7. Remove front exhaust tube.
8. Remove transmission from vehicle.
Refer to MT section.
9. Install engine slingers.
10. Hoist engine with engine slingers and remove engine mount-
ing bolts from both sides.
11. Remove engine from vehicle.
Installation
lInstall in reverse order of removal.
DEM021
ENGINE REMOVALTD
EM-70

18. Remove rear oil seal retainer assembly.
19. Remove bearing cap and crankshaft.
Place the bearings and caps in their proper order.
Inspection and Replacement
CYLINDER BLOCK DISTORTION
If beyond the specified limit, replace it.
Cylinder block distortion: mm (in)
Standard
Less than 0.05 (0.0020)
Limit
0.2 (0.008)
lRemove all traces of gasket from the cylinder block. Do not
allow pieces of the gasket to enter the oil and cooling water
passages during gasket removal.
CYLINDER LINER WEAR
1. Measure cylinder liner bore for out-of-round and taper with a
bore gauge. If beyond the limit, replace cylinder liner.
Standard inside diameter:
92.900 - 92.930 mm (3.6575 - 3.6587 in)
Refer to SDS, EM-102.
Wear limit:
0.20 mm (0.0079 in)
Out-of-round (X þ Y) standard:
0.020 mm (0.0008 in)
Taper (A þ B) standard:
0.020 mm (0.0008 in)
SEM657B
SEM658B
SEM038
DEM067
ENGINE OVERHAULTD
Disassembly (Cont'd)
EM-74