1998 NISSAN PICK-UP lock

b. Grade number of each crankshaft main journal is punched on
crankshaft. These numbers are punched in either Arabic or
Roman numerals.
c. Select main bearing with suitable thickness according to the
following example or table.
For example:
Main journal grade number: 1
Crankshaft journal grade number: 2
Main bearing grade number=1+2
= 3 (Yellow)
Main bearing grade number and identification color:
Main journal grade number
012
Crankshaft
journal grade
number0 0 (Black) 1 (Brown) 2 (Green)
1 or I 1 (Brown) 2 (Green) 3 (Yellow)
2 or II 2 (Green) 3 (Yellow) 4 (Blue)
Connecting rod bearing (Big end)
1. Install connecting rod bearing to connecting rod and cap.
2. Install connecting rod cap to connecting rod.
lTighten bolts to the specified torque.
3. Measure inner diameter ``C'' of each bearing.
4. Measure outer diameter ``Dp'' of each crankshaft pin journal.
5. Calculate connecting rod bearing clearance.
Connecting rod bearing clearance
= C þ Dp: mm (in)
Standard
0.010 - 0.035 (0.0004 - 0.0014)
Limit
0.09 (0.0035)
6. If it exceeds the limit, replace bearing.
7. If clearance cannot be adjusted within the standard of any
bearing, grind crankshaft journal and use undersized bear-
ing. Refer to step 7 of ``BEARING CLEARANCE Ð Main
bearing''.
SEM272C
AEM027
AEM028
CYLINDER BLOCKKA
Inspection (Cont'd)
EM-44

8. If crankshaft is replaced, select connecting rod bearing
according to the following table.
Connecting rod bearing grade number:
These numbers are punched in either Arabic or Roman numer-
als.
Crank pin grade numberConnecting rod bearing
grade number
00
1orI 1
2orII 2
Method B (Using plastigage)
CAUTION:
lDo not turn crankshaft or connecting rod while plasti-
gage is being inserted.
lWhen bearing clearance exceeds the specified limit,
ensure that the proper bearing has been installed. Then
if excessive bearing clearance exists, use a thicker main
bearing or undersized bearing so that the specified bear-
ing clearance is obtained.
CONNECTING ROD BUSHING CLEARANCE (Small
end)
1. Measure inner diameter ``C'' of bushing.
2. Measure outer diameter ``Dp'' of piston pin.
3. Calculate connecting rod bushing clearance.
CþDp=
þ0.015 to þ0.033 mm (þ0.0006 to þ0.0013 in) (Stan-
dard)
If out of specification, replace connecting rod assembly
and/or piston set with pin.
FLYWHEEL RUNOUT
Runout (Total indicator reading):
Flywheel Less than 0.1 mm (0.004 in)
CAUTION:
Do not allow any magnetic materials to contact the ring gear
teeth.
Assembly
PISTON
1. Heat piston to 60 to 70ÉC (140 to 158ÉF) and assemble
piston, piston pin and connecting rod.
lAlign the direction of piston and connecting rod.
lNumbers stamped on connecting rod and cap corre-
spond to each cylinder.
lAfter assembly, make sure connecting rod swings
smoothly.
SEM567B
EM142
SEM245E
AEM100
SEM262C
CYLINDER BLOCKKA
Inspection (Cont'd)
EM-45

2. Set piston rings as shown.
CAUTION:
lWhen piston rings are not replaced, make sure that pis-
ton rings are mounted in their original positions.
lWhen piston rings are being replaced and no punchmark
is present, piston rings can be mounted with either side
up.
3. Align piston rings so that end gaps are positioned as shown.
CRANKSHAFT
1. Set main bearings in their proper positions on cylinder block
and main bearing caps.
lConfirm that correct main bearings are used. Refer to
EM-42.
lApply new engine oil to bearing surfaces.
2. Install crankshaft and main bearing caps and tighten bolts to
the specified torque.
lApply new engine oil to the bolt threads and seat sur-
face.
lPrior to tightening bearing cap bolts, place bearing cap
in its proper position by shifting crankshaft in the axial
direction.
lTighten bearing cap bolts gradually in two or three
stages. Start with center bearing and move outward as
shown in figure.
lAfter securing bearing cap bolts, make sure crankshaft
turns smoothly by hand.
SEM215EA
SEM264C
SEM160B
SEM448C
EEM121
CYLINDER BLOCKKA
Assembly (Cont'd)
EM-46

3. Measure crankshaft end play.
Crankshaft end play: mm (in)
Standard
0.05 - 0.18 (0.0020 - 0.0071)
Limit
0.3 (0.012)
If beyond the limit, replace bearing with a new one.
4. Install connecting rod bearings in connecting rods and con-
necting rod caps.
lConfirm that correct bearings are used.
Refer to EM-45.
lInstall bearings so that oil hole in connecting rod aligns
with oil hole of bearing.
lApply new engine oil to bearing surfaces, bolt threads
and seating surfaces.
5. Install pistons with connecting rods.
a. Install them into corresponding cylinders with Tool.
lArrange so that front mark on piston head faces toward
front of engine.
lMake sure connecting rod does not scratch cylinder
wall.
lMake sure connecting rod bolts do not scratch crank-
shaft journals.
lApply new engine oil to piston rings and sliding surface
of piston.
b. Install connecting rod bearing caps.
Tighten connecting rod bearing cap nuts using the following
procedure.
Connecting rod bearing nut:
(1) Tighten to 14 to 16 N´m
(1.4 to 1.6 kg-m, 10 to 12 ft-lb).
(2) Tighten bolts 60
+5
þ0degrees clockwise
with an angle wrench.
If an angle wrench is not available, tighten
them to 38 to 44 N´m (3.9 to 4.5 kg-m, 28 to 33
ft-lb).
6. Measure connecting rod side clearance.
Connecting rod side clearance: mm (in)
Standard
0.2 - 0.4 (0.008 - 0.016)
Limit
0.6 (0.024)
If beyond the limit, replace connecting rod and/or crankshaft.
EEM122
SEM159B
SEM269CA
EEM123
EEM124
CYLINDER BLOCKKA
Assembly (Cont'd)
EM-47

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

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

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

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