1998 NISSAN PATROL Oil

Inspection
OIL AND WATER TUBES
Check tubes for clogging.
ROTOR SHAFT
1. Check rotor shaft for smooth rotating.
2. Check rotor shaft for carbon deposits.
SEM796C
SEM798C
SEM799C
TURBOCHARGER
EM-25

3. Measure runout of rotor shaft.
Runout (Total indicator reading):
0.056 - 0.127 mm (0.0022 - 0.0050 in)
4. Measure end play of rotor shaft.
End play:
0.013 - 0.097 mm (0.0005 - 0.0038 in)
TURBINE WHEEL
Check turbine wheel for the following:
+Oil
+Carbon deposits
+Deformed ®ns
+Contact with turbine housing
COMPRESSOR WHEEL
Check compressor wheel for the following:
+Oil
+Deformed ®ns
+Contact with compressor housing
WASTEGATE VALVE
Remove rod pin and check wastegate valve for cracks, deformation
and smooth movement.
Check valve seat surface for smoothness.
SEM800C
SEM801C
SEM802C
SEM803C
SEM804C
TURBOCHARGER
Inspection (Cont'd)
EM-26

CAUTION:
+When installing sliding parts such as camshaft and oil
seal, be sure to apply new engine oil on their sliding sur-
faces.
+When tightening cylinder head bolts, apply new engine oil
to thread portions and seat surfaces of bolts.
Removal
1. Remove charge air cooler assembly.
2. Set No. 1 cylinder at BDC on its expansion stroke.
3. Drain engine coolant from drain plugs on cylinder block and
radiator.
4. Remove air cleaner and/or air duct.
5. Remove timing belt.
6. Remove rocker cover securing bolts/nuts in numerical order
shown in ®gure.
To install rocker cover, tighten bolts/nuts in reverse order of
removal. Tighten in two or three stages.
7. Remove camshaft sprocket, injection pump drive sprocket and
back cover.
8. Disconnect exhaust manifold from exhaust tube.
9. Remove intake and exhaust manifold.
To install manifolds, tighten bolts/nuts in reverse order of
removal. Tighten in two or three stages.
SEM786F
SEM711B
SEM431C
CYLINDER HEAD
EM-30

10. Remove fuel injection tube assembly and spill tube.
11. Remove cylinder head bolts in numerical order and remove
cylinder head.
Disassembly
1. Remove following parts:
a. Thermostat housing
b. Engine slinger
c. Glow plate and glow plugs
2. Remove camshaft bracket securing nuts in numerical order
shown in ®gure in two or three stages.
To install camshaft bracket caps, tighten nuts in reverse order
of removal. Tighten in two or three stages.
3. Remove camshaft and oil seal.
4. Remove valve lifters.
5. Remove valve component parts with tool.
SEM703B
SEM714B
SEM716B
CYLINDER HEAD
Removal (Cont'd)
EM-31

Inspection
CYLINDER HEAD DISTORTION
Warpage of surface:
Less than 0.1 mm (0.004 in)
If beyond the speci®ed limit, replace it or resurface it.
Resurfacing limit:
The resurfacing limit of cylinder head is determined by the
cylinder block resurfacing in an engine.
Amount of cylinder head resurfacing is ``A''.
Amount of cylinder block resurfacing is ``B''.
The maximum limit is as follows:
A + B = 0.1 mm (0.004 in)
Nominal cylinder head height:
139.9 - 140.1 mm (5.508 - 5.516 in)
VALVE GUIDE CLEARANCE
1. Insert the valve stem into the valve guide and move it back,
forth and slide it.
If valve stem makes a clatter and moves back and forth exces-
sively out of line, or if it does not slide well, replace valve or
valve guide, or both.
2. Install valve stem into the valve guide.
3. Measure the de¯ection.
Stem to guide de¯ection limit:
0.1 mm (0.004 in)
(Half of dial gauge reading)
4. If it exceeds the limit, check valve to valve guide clearance.
(1) Measure valve stem diameter and guide inner diameter.
(2) Check that clearance is within the speci®cation.
Valve to valve guide clearance limit:
0.1 mm (0.004 in)
(3) If it exceeds the limit, replace valve or valve guide.
VALVE GUIDE REPLACEMENT
1. Heat cylinder head 150 to 160ÉC (302 to 320ÉF) in oil.
2. Remove the guide with suitable tool.
SEM718B
SEM719B
EM030
SEM871
CYLINDER HEAD
EM-32

3. Drive in the new guide until it projects out 10.3 mm (0.406 in).
4. Ream the bore using suitable tool.
Reaming bore:
7.000 - 7.018 mm (0.2756 - 0.2763 in)
COMBUSTION CHAMBER REPLACEMENT
Usually combustion chamber should not be removed.
However, if there are cracks or extensive damage, it should be
replaced.
1. Remove glow plug connecting plate, glow plugs and injection
nozzle.
2. Remove combustion chamber so that cylinder head will not be
damaged.
Be careful not to scratch inside of nozzle hole.
3. Install combustion chamber.
(1) Heat cylinder head 150 to 160ÉC (302 to 320ÉF) in oil.
(2) Align combustion chamber knock pin with cylinder head notch,
and install it into cylinder head using a plastic-tip hammer.
VALVE SEATS
1. Check valve and valve seat for contact.
Coat the valve face with prussian red lead. If contact is wrong,
correct valve seat. If the valve red lead appears 360É around
face, the valve stem and face are concentric. If not, repair or
replace valve.
2. Check valve seats for any evidence of pitting on valve contact
surface, and reseat or replace if worn out excessively.
Correct valve seat surface.
+When repairing valve seat, check valve and valve guide for
wear beforehand. If worn, replace them. Then correct valve
seat.
+Cut with both hands to uniform the cutting surface.
SEM872
SEM720B
SEM721B
SEM722B
CYLINDER HEAD
Inspection (Cont'd)
EM-33

Assembly
1. Install valve component parts.
Install valve spring with its narrow pitch side toward cylinder
head side.
a. When installing valve, apply engine oil on the valve stem
and lip of valve oil seal.
b. Check whether the valve face is free from foreign matter.
c. Install valve spring retainers on the intake side and valve
rotators on the exhaust side.
d. Valve rotators cannot be disassembled.
2. Set camshaft.
Set camshaft so that dowel pin faces up.
3. Install cam bracket caps so that front mark faces forward.
Cam bracket nut (Tighten in two or three stages):
:21-26Nzm
(2.1 - 2.7 kg-m, 15 - 20 ft-lb)
4. Apply engine oil to new oil seal and install it.
Installation
1. Install cylinder head gasket.
a. When replacing only cylinder head gasket, install same
grade gasket as the one formerly used.
b. When replacing or repairing cylinder block, cylinder head,
piston, connecting rod and crankshaft, select gasket as
follows:
SEM202
SEM731BB
SEM732B
SEM733B
CYLINDER HEAD
EM-38

Removal
1. Remove engine, transmission and transfer's undercovers, oil
pan guard and hood.
2. Drain engine coolant.
3. Remove charge air cooler assembly.
4. Remove vacuum hoses, fuel tubes, harnesses, and connectors
and so on.
5. Remove radiator assembly.
6. Remove drive belts.
7. Remove power steering oil pump, alternator and air conditioner
compressor.
8. Remove starter motor assembly.
9. Remove front exhaust tube.
10. Remove transmission from vehicle.
Refer to MT section.
11. Hoist engine with engine slingers and remove engine mounting
bolts from both sides.
12. Remove engine from vehicle.
Installation
+Install in reverse order of removal.
ENGINE REMOVAL
EM-45