Infiniti M45 (Y34). Manual — part 528
CAMSHAFT
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CAMSHAFT
PFP:13001
Removal and Installation
ABS000LT
1.
Cylinder head (right bank)
2.
Camshaft bracket (No. 2, 3, 4, 5)
3.
Adjusting shim
4.
Valve lifter
5.
Camshaft bracket (No.1)
6.
Washer
7.
Camshaft (EXH)
8.
Camshaft sprocket (EXH)
9.
Camshaft sprocket (INT)
10.
Camshaft (INT)
11.
Cylinder head (left bank)
12.
Adjusting shim
13.
Valve lifter
14.
Camshaft (INT)
15.
Camshaft sprocket (INT)
16.
Camshaft sprocket (EXH)
17.
Camshaft (EXH)
18.
Camshaft bracket (No.1)
19.
Washer
20.
Camshaft bracket (No. 2, 3, 4, 5)
21.
Camshaft bracket (INT, No. 6)
22.
Bracket
PBIC3053E
EM-50
CAMSHAFT
REMOVAL
1.
Remove timing chain. Refer to
EM-38, "Removal and Installation"
2.
With hexagonal part of camshaft locked with wrench, loosen
bolts securing camshaft sprocket to remove camshaft sprocket.
CAUTION:
To avoid interference between valves and pistons, do not
turn crankshaft or camshaft with timing chain discon-
nected.
3.
Loosen fixing bolts in reverse order of that shown in the figure to
remove camshaft brackets.
●
Lightly tapping with plastic hammer, remove camshaft bracket
(No.1) and camshaft bracket (No.6).
NOTE:
The bottom surface of each bracket will be stuck to cylinder
head because of liquid gasket.
4.
Remove camshaft.
5.
Remove adjusting shims and valve lifters if necessary.
●
Correctly identify location where each part is installed. Keep parts in an organized way to avoid mixing
them up.
INSPECTION AFTER REMOVAL
Camshaft Runout
1.
Put V block on precise flat bed, and support No.2 and No.5 jour-
nal of camshaft.
CAUTION:
Do not support journal No. 1 (on the side of camshaft
sprocket) because it has a different diameter from the other
four locations.
2.
Set dial indicator vertically to No.3 journal.
3.
Turn camshaft to one direction with hands, and measure cam-
shaft runout on dial indicator. (Total indicator reading)
●
If it exceeds the limit, replace camshaft.
PBIC0030E
PBIC0031E
Limit
: 0.02 mm (0.0008 in)
PBIC2499E
CAMSHAFT
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Camshaft Cam Height
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Measure camshaft cam height with micrometer.
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If it exceeds the limit, replace camshaft.
Camshaft Journal Oil Clearance
Outer Diameter of Camshaft Journal
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Measure outer diameter of camshaft journal with micrometer.
Inner Diameter of Camshaft Bracket
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Tighten camshaft bracket bolt with specified torque. Refer to
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Using inside micrometer, measure inner diameter “A” of cam-
shaft bracket.
Calculation of Camshaft Journal Oil Clearance
●
(Journal oil clearance) = (inner diameter of camshaft bracket) –
(outer diameter of camshaft journal)
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If out of the standard, replace either or both camshaft and cylinder head.
NOTE:
It is impossible to replace only camshaft bracket as camshaft bracket is manufactured with cylinder head.
Replace the whole cylinder head assembly.
Standard cam height
Intake
: 44.865 - 45.055 mm (1.7663 - 1.7738 in)
Exhaust
: 43.925 - 44.115 mm (1.7293 - 1.7368 in)
Cam wear limit
: 0.2mm (0.008in)
PBIC0039E
Standard:
No. 1
: 25.938 - 25.955 mm (1.0212 - 1.0218 in)
No. 2, 3, 4, 5
: 25.953 - 25.970 mm (1.0218 - 1.0224 in)
PBIC0040E
Standard:
26.000 - 26.021 mm (1.0236 - 1.0244 in)
Standard:
No. 1
: 0.045 - 0.083 mm (0.0018 - 0.0033 in)
No. 2, 3, 4, 5
: 0.030 - 0.068 mm (0.0012 - 0.0027 in)
PBIC1645E
EM-52
CAMSHAFT
Camshaft End Play
●
Install dial indicator in thrust direction on front end of camshaft.
Measure end play when camshaft is moved forward/backward
(in direction to axis).
●
Measure the following parts if out of the standard.
–
Dimension “A” for camshaft No. 1 journal
–
Dimension “B” for cylinder head No. 1 journal
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Refer to the standards above, and then replace camshaft and/or
cylinder head.
Camshaft Sprocket Runout
1.
Install camshaft in cylinder head. Refer to
for the tightening procedure.
2.
Install camshaft sprocket to camshaft.
3.
Measure camshaft sprocket runout. (Total indicator reading)
4.
If it exceeds the limit, replace camshaft sprocket.
Valve Lifter and Adjusting Shim
Check if surface of valve lifter and adjusting shim has any wear or
cracks.
●
If anything above is found, replace valve lifter or adjusting shim.
●
When replacing adjusting shim, refer to
Standard:
0.115 - 0.188 mm (0.0045 - 0.0074 in)
PBIC2446E
Standard
: 30.500 - 30.548 mm (1.2008 - 1.2027 in)
Standard
: 30.360 - 30.385 mm (1.1953 - 1.1963 in)
KBIA2426J
Limit
: 0.15 mm (0.0059 in)
KBIA0181J
PBIC0231E
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