Infiniti I35 (A33). Manual — part 494
SEM139D
I
Using a feeler gauge, measure clearance between valve lifter
and camshaft.
I
Record any valve clearance measurements which are out of
specification. They will be used later to determine the required
replacement valve lifter.
Valve clearance for checking (Cold):
Intake
0.26 - 0.34 mm (0.010 - 0.013 in)
Exhaust
0.29 - 0.37 mm (0.011 - 0.015 in)
SEM894E
8.
Turn crankshaft 240° and align as above.
9.
Set No. 3 cylinder at TDC on its compression stroke.
10. Check only those valves shown in the figure.
Measuring position (RH bank)
No. 1 CYL
No. 3 CYL
No. 5 CYL
No. 3 cylinder at TDC
EXH
X
INT
X
Measuring position (LH bank)
No. 2 CYL
No. 4 CYL
No. 6 CYL
No. 3 cylinder at TDC
INT
X
EXH
X
SEM958E
11. Turn crankshaft 240° and align as above.
12. Set No. 5 cylinder at TDC on its compression stroke.
13. Check only those valves shown in the figure.
Measuring position (RH bank)
No. 1 CYL
No. 3 CYL
No. 5 CYL
No. 5 cylinder at TDC
EXH
X
INT
X
Measuring position (LH bank)
No. 2 CYL
No. 4 CYL
No. 6 CYL
No. 5 cylinder at TDC
INT
X
EXH
X
14. If all valve clearances are within specification, install the fol-
lowing parts. If they are out of specification, adjust the valve
clearances.
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Intake manifold collectors
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RH and LH rocker covers
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All spark plugs
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All ignition coils
GI
MA
LC
EC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
CYLINDER HEAD
Valve Clearance (Cont’d)
EM-67
ADJUSTING
NHEM0049S02
Adjust valve clearance while engine is cold.
Perform adjustment by selecting head thickness of valve lifter
(Adjusting shims are not used).
1.
Remove camshaft.
2.
Remove valve lifter at location where measured value is out-
side standard.
SEM754G
SEM755G
3.
Measure center thickness of removed valve lifter with
micrometer.
4.
Use equation below to calculate valve lifter thickness for
replacement.
Valve lifter thickness calculation: t = t1 + (C1 − C2)
t = Thickness of replacement valve lifter
t1 = Thickness of removed valve lifter
C1 = Measured valve clearance
C2 = Standard valve clearance:
Intake: 0.30 mm (0.012 in)
Exhaust: 0.33 mm (0.013 in)
I
Thickness of new valve lifter can be identified by stamp mark
on reverse side (inside cylinder).
Unit: mm (in)
Stamp mark
Thickness of valve lifter
Starting: 788U or 788R
7.88 (0.3102)
Ending: 840U or 840R
8.40 (0.3307)
I
Available thickness of valve lifter (Factory setting):
7.88 - 8.40 mm (0.3102 - 0.3307 in) [in 0.02 mm (0.0008 in)
step] in 27 sizes (Intake/Exhaust)
5.
Install selected valve lifter.
6.
Install camshaft.
7.
Rotate crankshaft a few turns by hand.
8.
Confirm that valve clearance is within standard.
9.
After repair, confirm that valve clearance is within standard
with engine warmed-up.
Valve clearance:
Unit: mm (in)
Cold
Hot* (reference data)
Intake
0.26 - 0.34 (0.010 - 0.013)
0.304 - 0.416 (0.012 - 0.016)
Exhaust
0.29 - 0.37 (0.011 - 0.015)
0.308 - 0.432 (0.012 - 0.017)
*: Approximately 80°C (176°F)
CYLINDER HEAD
Valve Clearance (Cont’d)
EM-68
Removal and Installation
NHEM0050
SEM183H
1.
LH engine mounting
2.
RH engine mounting
3.
Mounting bracket
4.
Rear engine mounting
5.
Insulator
6.
Center member
7.
Front engine mounting
8.
Insulator
WARNING:
I
Situate vehicle on a flat and solid surface.
I
Place chocks at front and back of rear wheels.
I
Do not remove engine until exhaust system has com-
pletely cooled off. Otherwise, you may burn yourself
and/or fire may break out in fuel line.
I
For safety during subsequent steps, the tension of wires
should be slackened against the engine.
GI
MA
LC
EC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
ENGINE ASSEMBLY
Removal and Installation
EM-69
I
Before disconnecting fuel hose, release fuel pressure
from fuel line.
Refer to EC-55, “Fuel Pressure Release”.
I
Before removing front axle from transaxle, place safety
stands under designated front supporting points. Refer to
GI-49, “Garage Jack and Safety Stand”.
I
Be sure to hoist engine and transaxle in a safe manner.
I
For engines not equipped with engine slingers, attach
proper slingers and bolts described in PARTS CATALOG.
CAUTION:
I
When lifting engine, be careful not to strike adjacent parts,
especially the following: Accelerator wire casing, brake
lines, and brake master cylinder.
I
In hoisting the engine, always use engine slingers in a
safe manner.
I
In removing drive shaft, be careful not to damage grease
seal of transaxle.
I
Before separating engine and transaxle, remove the
crankshaft position sensor (POS) from the assembly.
I
Always pay extra attention not to damage edge of crank-
shaft position sensor (POS) or ring gear teeth.
SEM825G
REMOVAL
NHEM0050S01
1.
Remove engine undercover and hood.
2.
Drain engine coolant from both cylinder block and radiator.
Refer to MA-14, “Changing Engine Coolant”.
3.
Remove vacuum hoses, fuel hoses, wires, harnesses, connec-
tors and so on.
4.
Remove front exhaust tubes, ball joints and drive shafts. Refer
to FE-9, “Exhaust System” and AX-9, “Drive Shaft”.
5.
Remove radiator and fans. Refer to LC-20, “Radiator”.
6.
Remove drive belts. Refer to MA-13, “Checking Drive Belts”.
7.
Remove alternator, compressor and power steering oil pump
from engine. Refer to SC-29, “Removal and Installation”, HA-112,
“Compressor” and ST-25, “Power Steering Oil Pump”.
ENGINE ASSEMBLY
Removal and Installation (Cont’d)
EM-70
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