NISSAN PICK-UP 1998 Repair Manual

REPLACING PILOT BUSHING
1. Remove pilot bushing.
2. Install pilot bushing.
SEM916AB
SEM561E
CYLINDER BLOCKKA
Assembly (Cont'd)
EM-48

DEM105N
OUTER COMPONENT PARTSTD
EM-49

DEM106N
OUTER COMPONENT PARTSTD
EM-50

Measurement of Compression Pressure
1. Warm up engine.
2. Stop engine. Remove glow plate and glow plugs.
3. Fit compression gauge adapter to cylinder head.
Compression gauge adapter:
:15-20Nzm (1.5 - 2.0 kg-m, 11 - 14 ft-lb)
4. Disconnect fuel cut solenoid wire connector.
5. Crank engine, then read gauge indication.
lEngine compression measurement should be made as
quickly as possible.
Compression pressure:
Unit: kPa (bar, kg/cm2, psi)/200 rpm
Standard 2,942 (29.4, 30, 427)
Minimum 2,452 (24.5, 25, 356)
Differential limit between cylinders 294 (2.9, 3, 43)
6. If cylinder compression in one or more cylinders is low, pour
a small quantity of engine oil into cylinders through the glow
holes and retest compression.
lIf adding oil helps the compression pressure, chances
are that piston rings are worn or damaged.
lIf pressure stays low, valve may be sticking or seating
improperly.
lIf cylinder compression in any two adjacent cylinders is
low, and if adding oil does not help the compression,
there is leakage past the gasketed surface.
Oil and water in combustion chambers can result from
this problem.
DEM019.DEM019
DEM020
DEM058
COMPRESSION PRESSURETD
EM-51

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

DEM110
CYLINDER HEADTD
EM-53

CAUTION:
lWhen installing sliding parts such as rocker arms, cam-
shaft and oil seal, be sure to apply new engine oil on
their sliding surfaces.
lWhen tightening cylinder head bolts and rocker shaft
bolts, apply new engine oil to thread portions and seat
surfaces of bolts.
Removal
1. Set No. 1 cylinder at TDC (top dead center) on its compres-
sion stroke.
2. Drain engine coolant from drain plugs on cylinder block and
radiator.
3. Remove air cleaner and/or air duct.
4. Remove alternator adjusting bolt.
5. Disconnect exhaust manifold from front exhaust tube.
6. Disconnect radiator outlet hose and thermostat housing
water inlet hose.
7. Remove air intake housing.
8. Remove fuel injection tube assembly and spill tube.
9. Remove injection nozzle holder and top nozzle gasket using
deep socket wrench.
MEM125A
DEM024
DEM025
DEM026
CYLINDER HEADTD
EM-54

10. Remove rocker cover.
11. Remove rocker shaft with rocker arms.
12. Remove push rods.
13. Remove cylinder head bolts in numerical order and remove
cylinder head.
Head warpage or cracking could result from removing in
incorrect order.
Disassembly
1. Remove following parts:
a. Intake manifold
b. Exhaust manifold
c. Thermostat housing
d. Alternator adjusting bar & engine slinger
e. Glow plate and glow plugs
2. Remove valve component parts with Tool.
SEM607F
DEM028
SEM623B
SEM624B
DEM029-A
CYLINDER HEADTD
Removal (Cont'd)
EM-55

3. Remove valve oil seals with Tool.
4. Disassemble rocker shaft assembly.
a. Remove rocker shaft lock bolt.
b. Remove valve rocker and rocker shaft bracket.
If it is difficult to remove rocker shaft bracket, immerse
rocker shaft assembly in oil of 70ÉC (158ÉF) for a few min-
utes and then remove bracket.
Inspection
CYLINDER HEAD DISTORTION
Cylinder head distortion: mm (in)
Standard
Less than 0.07 (0.0028)
Limit
0.2 (0.008)
If beyond the specified limit, correct with a surface grinder. Cyl-
inder head height should be greater than 89.7 mm (3.531 in)
after surface has been ground.
VALVE GUIDE CLEARANCE
lValve guide clearance should be measured parallel with
rocker arm. (Generally, a large amount of wear occurs in
this direction.)
Stem to guide clearance: mm (in)
Limit
Intake 0.15 (0.0059)
Exhaust 0.20 (0.0079)
Maximum allowable deflection
(Dial indicator reading)
Intake 0.30 (0.0118)
Exhaust 0.40 (0.0157)
lTo determine the correct replacement part, measure
valve stem diameter and valve guide inner diameter.
Valve stem diameter: mm (in)
Standard
Intake
7.962 - 7.977 (0.3135 - 0.3141)
Exhaust
7.945 - 7.960 (0.3128 - 0.3134)
SEM626BA
SEM627B
SEM648B
SEM586A
EM030
CYLINDER HEADTD
Disassembly (Cont'd)
EM-56

Valve guide inner diameter:
8.000 - 8.015 mm (0.3150 - 0.3156 in)
VALVE GUIDE REPLACEMENT
1. Drive out valve guide with a press [under a 20 kN (2 ton, 2.2
US ton, 2.0 Imp ton) pressure] or hammer, and suitable tool.
2. Press service valve guide onto cylinder head using suitable
tool until the guide projects out 15.8 to 16.2 mm (0.622 to
0.638 in).
3. Ream valve guide.
Finished size:
8.000 - 8.015 mm (0.3150 - 0.3156 in)
VALVE SEATS
Check valve for any evidence of pitting at valve contact surface,
and reseat or replace if worn out excessively.
lWhen repairing valve seats, check valve and valve guide
for wear beforehand. If worn, replace them. Then correct
valve seat.
lThe cutting should be done with both hands for uniform
cutting.
SEM649B
SEM628B
SEM629BA
SEM630B
SEM024-A
CYLINDER HEADTD
Inspection (Cont'd)
EM-57