1998 NISSAN PICK-UP engine

CAUTION:
lAfter removing timing chain, do not turn crankshaft and
camshaft separately, or valves will strike piston heads.
lWhen installing rocker arms, camshafts, chain
tensioner, oil seals, or other sliding parts, lubricate con-
tacting surfaces with new engine oil.
lApply new engine oil to bolt threads and seat surfaces
when installing cylinder head, camshaft sprockets,
crankshaft pulley, and camshaft brackets.
Removal
1. Disconnect battery terminal.
2. Remove air cleaner and air intake duct.
3. Drain coolant by removing cylinder block drain plug and
radiator drain cock.
4. Remove heater hose and radiator hoses.
5. Remove radiator with shroud and cooling fan.
6. Remove the following belts.
lPower steering drive belt
lCompressor drive belt
lAlternator drive belt
7. Remove accel control wire.
8. Disconnect exhaust manifold from exhaust front tube.
SEM571FA
TIMING CHAINKA
EM-13

9. Remove PCV hoses from rocker cover.
10. Remove alternator and bracket.
11. Remove power steering oil pump and bracket from engine.
12. Remove vacuum hoses, fuel hoses, wires, harness, connec-
tors and so on.
13. Remove all high tension wires.
14. Remove rocker cover.
lLoosen bolts in numerical order as shown in figure.
15. Remove all spark plugs.
16. Set No. 1 piston at TDC on its compression stroke.
17. Remove distributor.
Do not turn rotor with distributor removed.
18. Remove the following parts.
lPower steering pump, idler pulley and power steering pump
brackets
lCompressor idler pulley
lOil pump with pump drive spindle
SEM578F
SEM572F
SEM579F
SEM580F
TIMING CHAINKA
Removal (Cont'd)
EM-14

Inspection
lCheck for cracks and excessive wear at roller links.
Replace chain if necessary.
Installation
1. Install crankshaft sprocket, oil pump drive gear and oil
thrower.
lMake sure that mating marks on crankshaft sprocket
face front of engine.
2. Position crankshaft so that No. 1 piston is set at TDC (Key-
way at 12 o'clock) fit timing chain to crankshaft sprocket so
that mating mark is in line with mating mark on crankshaft
sprocket.
3. Temporarily install cylinder head with new gasket. Position
camshaft so that keyway is set at 12 o'clock.
lSet timing chain by aligning its mating marks with those
of crankshaft sprocket and camshaft sprocket.
SEM204C
SEM205C
SEM589F
TIMING CHAINKA
EM-17

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

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

Assembly
1. Install valve component parts.
lAlways use new valve oil seal. Refer to OIL SEAL
REPLACEMENT.
lBefore installing valve oil seal, install inner valve spring
seat.
lInstall outer valve spring (uneven pitch type) with its
narrow pitch side toward cylinder head side.
lAfter installing valve component parts, use plastic ham-
mer to lightly tap valve stem tip to assure a proper fit.
2. Install camshaft, placing knock pin towards front of engine
and in the top position.
lApply engine oil to camshaft when mounting onto cylin-
der head.
3. Install camshaft brackets.
lFront mark is punched on the camshaft bracket.
Location (from front side)Identification
Mark Punched
No. 1 51 Ð
No. 2 52 2
No. 3 53 Ð
No. 4 52 4
No. 5 55 Ð
4. Install rocker shaft with rocker arms.
lInstall retainer with cutout facing direction shown in figure at
left.
SEM638B
SEM236C
SEM606F
SEM399E
SEM274C
CYLINDER HEADKA
EM-33