Infiniti F50. Manual — part 543
OIL SEAL
EM-59
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Install new oil seal in the direction shown in the figure.
CAUTION:
Be careful not to scratch or make burrs on circumference of
oil seal.
2.
For the following operations, perform steps in the reverse order
of removal.
3.
Perform steps in the reverse order of removal for the following
operations.
SEM715A
EM-60
OIL SEAL
Removal and Installation of Rear Oil Seal
EBS00JX9
REMOVAL
1.
Remove transmission assembly. Refer to
AT-296, "TRANSMISSION ASSEMBLY"
a.
Remove drive plate.
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Holding crankshaft pulley mounting bolts, lock crankshaft to remove bolts fixing drive plate.
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Loosen fixing bolts diagonally.
CAUTION:
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Be careful not to damage drive plate. Especially, avoid deforming and damaging of signal plate
teeth (circumference position).
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Place the drive plate with signal plate surface facing other than downward.
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Keep magnetic materials away from signal plate.
b.
Remove engine rear plate.
2.
Remove rear oil seal using a suitable tool.
CAUTION:
Be careful not to damage crankshaft and oil seal retainer
surface.
INSTALLATION
1.
Install rear oil seal to oil seal retainer.
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Tap until flattened with front edge of oil seal retainer. Do not
damage or scratch outer circumference of oil seal.
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Install new oil seal in the direction shown in the figure.
CAUTION:
Be careful not to scratch or make burrs on circumference
of oil seal.
2.
Perform steps in the reverse order of removal for the following
operations.
SBIA0360E
SBIA0360E
SEM715A
CYLINDER HEAD
EM-61
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CYLINDER HEAD
PFP:11041
On-Vehicle Service
EBS001K1
CHECKING COMPRESSION PRESSURE
1.
Remove engine cover with power tool, air cleaner cover and battery cover. Refer to
.
2.
Warm up engine thoroughly. Then, stop it.
3.
Release fuel pressure.
a.
Remove fuel pump fuse, and start engine. Refer to
EC-48, "FUEL PRESSURE RELEASE"
for fuel pump
fuse location.
b.
After engine stalls, crank it two or three times to release all fuel pressure.
●
Let fuel pump fuse removed until the end of step 7.
4.
Remove ignition coil and spark plug from each cylinder. Refer to
EM-28, "Removal and Installation"
EM-29, "Removal and Installation"
5.
Connect engine tachometer (not required in use of CONSULT-II).
6.
Install compression gauge with adapter onto spark plug hole.
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Use compression gauge adapter which is required on No.7
and No.8 cylinders.
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Use compression gauge whose picking up end inserted to
spark plug hole is smaller than 20 mm (0.79 in) in diameter.
Otherwise, it may be caught by cylinder head during removal.
7.
With accelerator pedal fully depressed, turn ignition switch to
“START” for cranking. When the gauge pointer stabilizes, read
the compression pressure and engine rpm. Perform these steps
to check each cylinder.
Compression pressure
Unit: kPa (kg/cm
2
, psi) /rpm
CAUTION:
Always use a fully charged battery to obtain specified engine speed.
●
If the engine speed is out of specified range, check battery liquid for proper gravity. Check engine
speed again with normal battery gravity.
●
If compression pressure is below minimum value, check valve clearances and parts associated with
combustion chamber (Valve, valve seat, piston, piston ring, cylinder bore, cylinder head, cylinder head
gasket). After the checking, measure compression pressure again.
●
If some cylinders have low compression pressure, pour small amount of engine oil into the spark plug
hole of the cylinder to re-check it for compression.
–
If the added engine oil improves the compression, the piston rings may be worn out or damaged. Check
the piston rings and replace if necessary.
–
If the compression pressure remains at low level despite the addition of engine oil, the valves may be
malfunctioning. Check the valves for damage. Replace the valve or valve seat accordingly.
PBIC0066E
SEM387C
Standard
Minimum
Deference limit between cylinders
1,320 (13.5, 191) / 300
1,130 (11.5, 164) / 300
98 (1.03, 14) / 300
EM-62
CYLINDER HEAD
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If two adjacent cylinders have respectively low compression pressure and their compression remains
low even after the addition of engine oil, the gaskets are leaking. In such a case, replace the cylinder
head gaskets.
8.
Install removed parts in the reverse order of removal.
9.
Start engine, and confirm that engine runs smoothly.
10. Perform trouble diagnosis. If DTC appears, erase it. Refer to
Removal and Installation
EBS00NBD
REMOVAL
1.
Remove engine assembly from vehicle. Refer to
EM-70, "Removal and Installation"
2.
Remove the following components and related parts:
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Auto tensioner of drive belts and idler pulley. Refer to
EM-14, "Drive Belt Auto Tensioner and Idler Pul-
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Thermostat housing and hose. Refer to
CO-24, "Removal and Installation"
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Oil pan and oil strainer. Refer to
EM-25, "Removal and Installation"
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Intake manifold upper and intake manifold lower. Refer to
EM-17, "Removal and Installation"
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Fuel tube and fuel injector assembly. Refer to
EM-31, "Removal and Installation"
.
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Ignition coil. Refer to
EM-28, "Removal and Installation"
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Rocker cover. Refer to
EM-33, "Removal and Installation"
.
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Exhaust manifold and three way catalyst. Refer to
EM-22, "Removal and Installation"
3.
Remove crankshaft pulley, front cover, oil pump, and timing chain. Refer to
.
4.
Remove camshaft sprockets and camshafts. Refer to
EM-46, "Removal and Installation"
PBIC1667E
1.
Engine coolant temperature sensor
2.
Washer
3.
Cylinder head gasket (left bank)
4.
Harness bracket
5.
Cylinder head (right bank)
6.
Cylinder head bolt
7.
Cylinder head gasket (right bank)
8.
Cylinder head bolt
9.
Cylinder head (left bank)
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