Nissan Terrano model r20 series 2004. Manual — part 36
VALVE OIL SEAL
1. Remove timing chain. Refer to EM-26, “TIMING CHAIN”.
2. Remove injection nozzle assembly. Refer to “Injection Tube and
Injection Nozzle” in “BASIC SERVICE PROCEDURE” in EC
section.
3. Remove camshaft. Refer to EM-30, “CAMSHAFT”.
4. Remove valve lifters and mark order No. on each lifter.
5. Replace valve oil seal according to the following procedure.
When replacing valve oil seal, set the corresponding piston at
TDC. Failure to do so causes the valve to drop into the cylin-
der.
1) Set No. 1 cylinder at TDC.
2) Remove valve springs and valve oil seals for No. 1 and No. 4
cylinders. Valve spring seats should not be removed.
3) Install new valve oil seals for No. 1 and No. 4 cylinders as
illustrated. Reinstall valve springs. (pink paint side toward cyl-
inder head)
4) Install valve spring retainers on intake valves and valve rotators
on exhaust valves, and remount valve assembly.
5) Set No. 2 cylinder at TDC.
6) Replace valve oil seals for No. 2 and No. 3 cylinders according
to steps 2) and 3).
7) Install valve lifters in original positions.
CRANKSHAFT OIL SEAL INSTALLING DIRECTION AND
MANNER
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When installing crankshaft oil seals, be careful to install
them correctly, as shown in the figure.
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Wipe off excess oil after installing oil seal.
SEM354G
SEM355G
SEM356G
SEM357G
SEM715A
OIL SEAL REPLACEMENT
ZD
EM-50
CRANKSHAFT FRONT OIL SEAL
1. Remove the front cover. Refer to “TIMING GEAR”.
2. Remove front oil seal with a suitable tool.
3. Apply engine oil to new oil seal and install oil seal using a suit-
able tool.
CRANKSHAFT REAR OIL SEAL
1. Remove oil pan assembly. Refer to EM-22, “OIL PAN”.
2. Remove clutch cover assembly.
3. Remove flywheel and rear plate.
4. Remove oil seal retainer assembly.
5. Apply a continuous bead of liquid gasket to rear oil seal
retainer.
a. Coat of liquid gasket should be maintained within 2.0 to 3.0
mm (0.079 to 0.118 in) dia. range.
b. Attach oil seal retainer to cylinder block within five min-
utes after coating.
c. Wait at least 30 minutes before refilling engine oil or start-
ing engine.
d. Use Genuine Liquid Gasket or equivalent.
SEM358G
FEM044
SLC822
FEM053
OIL SEAL REPLACEMENT
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EM-51
Removal and Installation
Removal
1. Remove the following. (Refer to corresponding chapter for
detailed auxiliary work.)
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Drain coolant
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Rocker cover
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Injection tube
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Spill tube
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High pressure injection nozzle assembly
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Timing chain
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Camshaft
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Catalytic converter
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Turbocharger assembly
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Exhaust manifold
2. Remove mounting bolts of the gear case and water pump as
shown by arrows in the figure.
3. Remove oil return pipe from the rear side of cylinder head.
4. Remove intake manifold.
SEM359G
FEM054
CYLINDER HEAD
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EM-52
5. Remove cylinder head assembly.
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Loosen and remove mounting bolts in the reverse order shown
in the figure.
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Lift up the cylinder head assembly to avoid interference with
dowel pins located between the block and head, and remove
cylinder head assembly.
CAUTION:
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Do not drop the O-ring located between the front of cylin-
der head and the rear of gear case into the engine.
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Remove glow plug in advance to avoid damage as the tip
of the glow plug projects from the bottom of the cylinder
head, or, place wood blocks beneath both ends of the cyl-
inder head to keep the cylinder bottom from any contact.
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For glow plug removal, the following shall be noted.
CAUTION:
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To avoid breakage, do not remove glow plug unless nec-
essary.
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Perform continuity test with glow plug installed.
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Keep glow plug from any impact. (Replace if dropped from
a height 10 cm (3.94 in) or higher.)
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Do not use air impact wrench.
6. Remove idler gear.
CAUTION:
While removing idler gear, keep the rear of idler gear facing up
to prevent idler shaft from falling.
Inspection
CYLINDER HEAD BOLT DEFORMATION (ELONGATION)
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Using micrometer, measure the outer diameters d1 and d2 of
bolt thread as shown in the figure.
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If the necking point can be identified, set it as measuring point
d2.
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Calculate the difference between d1 and d2.
Limit: 0.15 mm (0.0059 in)
IDLER GEAR END PLAY
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Tighten mounting bolts to the specified torque.
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Using feeler gauge, measure the clearance between gear plate
and idler gear.
Standard: 0.07 - 0.14 mm (0.0028 - 0.0055 in)
Limit: 0.2 mm (0.0079 in)
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If the measured value exceeds the limit value, replace idler
gear, shaft, and gear plate.
FEM055
SEM379G
FEM056
CYLINDER HEAD
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Removal (Cont’d)
EM-53
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