1998 NISSAN PICK-UP Repair Manual

13. Install oil pump and distributor driving spindle with new gas-
ket in front cover.
a. Assemble oil pump and driving spindle, aligning punchmark
on driving spindle with oil hole.
b. Make sure that driving spindle is set as shown in figure.
14. Install distributor.
15. Make sure that No. 1 piston is set at TDC and that distribu-
tor rotor is set at No. 1 cylinder spark position.
16. Install cylinder head outside bolts.
17. Install intake manifold support.
18. Install rubber plugs as follows:
a. Apply liquid gasket to rubber plugs.
lRubber plugs should be replaced with new ones.
lRubber plugs should be installed within 5 minutes of
applying liquid gasket.
SEM395E
SEM574F.SEM574F
SEM572F
SEM596F
SEM931B
TIMING CHAINKA
Installation (Cont'd)
EM-20

b. Install rubber plugs, then move them with your fingers to
uniformly spread the gasket on cylinder head surface.
lRubber plugs should be installed flush with the surface.
lDo not start the engine for 30 minutes after installing
rocker cover.
lWipe clean excessive liquid gasket from cylinder head
top surface.
19. Install rocker cover.
Rocker cover tightening procedure:
(1) Tighten bolts
V1-V2in that order to 3 N´m (0.3 kg-m, 26
in-lb).
(2) Tighten nuts
V4-V3-V2-V1-V8-V7-V6-V5-V4-
V3-V2-V1in that order to 7 to 11 Nzm (0.7 to 1.1 kg-m,
61 to 95 in-lb).
20. Install parts in the reverse order of removal.
SEM932B
SEM933BA
SEM595F
TIMING CHAINKA
Installation (Cont'd)
EM-21

Valve Oil Seal
1. Remove rocker cover.
2. Remove rocker shaft assembly. (Refer to ``Disassembly'',
``CYLINDER HEAD'', EM-27.)
3. Remove valve spring and valve oil seal with Tool or suitable
tool.
lPiston concerned should be set at TDC to prevent valve
from falling.
4. Apply engine oil to new valve oil seal and install it with Tool.
lBefore installing valve oil seal, install valve spring seat.
Front Oil Seal
1. Remove radiator shroud and crankshaft pulley.
2. Remove front oil seal.
lBe careful not to scratch front cover.
3. Apply engine oil to new oil seal and install it using suitable
tool.
lInstall new oil seal in the direction shown.
SEM396EA
SEM822F
.Unit: mm (in)
AEM258
SEM715A
OIL SEAL REPLACEMENTKA
EM-22

Rear Oil Seal
1. Remove flywheel.
2. Remove rear oil seal retainer.
3. Remove rear oil seal from retainer.
lBe careful not to scratch rear oil seal retainer.
4. Apply engine oil to new oil seal and install it using suitable
tool.
lInstall new oil seal in the direction shown.
5. Install rear oil seal retainer.
a. Before installing rear oil seal retainer, remove all traces of
liquid gasket from mating surface using a scraper.
lAlso remove traces of liquid gasket from mating surface
of cylinder block.
b. Apply a continuous bead of liquid gasket to mating surface
of rear oil seal retainer.
lUse Genuine Liquid Gasket or equivalent.
lApply around inner side of bolt holes.
SEM895A
SEM715A
SEM897A
SEM896A
SEM085E
OIL SEAL REPLACEMENTKA
EM-23

SEM814F
CYLINDER HEADKA
EM-24

CAUTION:
lWhen installing rocker arms, camshaft and oil seal, lubri-
cate contacting surfaces with new engine oil.
lWhen tightening cylinder head bolts and rocker shaft
bolts, lubricate bolt threads and seat surfaces with new
engine oil.
lHydraulic valve lifters are installed in each rocker arm.
If hydraulic valve lifter is kept on its side, even when
installed in rocker arm, there is a risk of air entering it.
When rocker arms are removed, stand them straight up
or soak them in new engine oil.
lDo not disassemble hydraulic valve lifter.
lAttach tags to valve lifters so as not to mix them up.
Removal
1. Release fuel pressure. Refer to EC section (``Fuel Pressure
Release'').
2. Drain coolant from radiator and drain plug of block.
3. Remove the following parts.
lPower steering drive belt
lPower steering pump, idler pulley and power steering brack-
ets
lVacuum hoses of swirl control valve and pressure control
solenoid valve
lAccelerator wire bracket
4. Remove bolts which hold intake manifold collector to intake
manifold.
5. Remove bolts which hold intake manifold to cylinder head
while raising collector upwards.
6. Remove exhaust manifold cover and exhaust manifold.
7. Remove rocker cover.
lWhen removing rocker cover, do not hit rocker cover
against rocker arm.
8. Set No. 1 piston at TDC on its compression stroke.
SEM878BA
SEM868BA
.NG
SEM216C
CYLINDER HEADKA
Rear Oil Seal
EM-25

lMake sure No. 1 cylinder is at TDC by looking at the distribu-
tor rotor position.
9. Loosen camshaft sprocket bolt.
lSupport timing chain by using Tool as shown in figure.
10. Apply paint marks to timing chain matched with mating marks
of camshaft sprockets.
11. Remove camshaft sprocket.
12. Remove front timing cover to cylinder head bolts.
SEM572F
SEM576F
SEM597F
SEM219C
SEM577F
CYLINDER HEADKA
Removal (Cont'd)
EM-26

13. Remove cylinder head.
lLoosen in numerical order.
lA warped or cracked cylinder head could result from
removing in incorrect order.
lLoosen cylinder head bolts in two or three steps.
Disassembly
1. Remove rocker shaft assembly.
a. When loosening bolts, evenly loosen from outside in
sequence.
b. Bolts should be loosened in two or three steps.
2. Remove camshaft.
lBefore removing camshaft, measure camshaft end play.
(Refer to ``Inspection''.)
3. Remove valve components with Tool.
4. Remove valve oil seals. (Refer to ``OIL SEAL REPLACE-
MENT'', EM-22.)
Inspection
CYLINDER HEAD DISTORTION
lClean surface of cylinder head.
lUse a reliable straightedge and feeler gauge to check the
flatness of cylinder head surface.
lCheck along six positions shown in figure.
Head surface flatness: mm (in)
Standard
Less than 0.03 (0.0012)
Limit
0.1 (0.004)
If beyond the specified limit, replace or resurface.
Resurfacing limit:
The limit for cylinder head resurfacing is determined by the
cylinder block resurfacing.
Amount of cylinder head resurfacing is ``A''
Amount of cylinder block resurfacing is ``B''
The maximum limit is as follows:
A+B=0.2mm(0.008 in)
After resurfacing cylinder head, check that camshaft rotates
freely by hand. If resistance is felt, cylinder head must be
replaced.
SEM588F
SEM598F
SEM211EA
AEM257.AEM257
CYLINDER HEADKA
Removal (Cont'd)
EM-27