Infiniti I30 (A33). Manual — part 480
CAUTION:
I
When installing camshafts, chain tensioners, oil seals, or
other sliding parts, lubricate contacting surfaces with new
engine oil.
I
Apply new engine oil to threads and seat surfaces when
installing cylinder head, camshaft sprocket, crankshaft
pulley, and camshaft bracket.
I
Attach tags to valve lifters so as not to mix them up.
Removal
NHEM0017
I
This removal is the same procedure as that for timing
chain. Refer to “Removal”, EM-22.
I
Apply paint to camshaft sprockets for alignment during
installation.
SEM167F
Disassembly
NHEM0018
1.
Remove rear timing chain case bolts.
SEM279G
2.
Remove rear timing chain case.
SEM856E
3.
Remove intake and exhaust camshafts and camshaft brackets.
I
Equally loosen camshaft bracket bolts in several steps in the
numerical order shown in the figure.
For reinstallation, be sure to put marks on camshaft
bracket before removal.
4.
Remove valve component parts.
Refer to “VALVE OIL SEAL”, EM-35.
GI
MA
LC
EC
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AX
SU
BR
ST
RS
BT
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SC
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IDX
CYLINDER HEAD
Components (Cont’d)
EM-39
SEM857E
SEM489F
5.
Remove RH and LH camshaft chain tensioners from cylinder
head.
SEM859E
SEM860E
6.
Remove cylinder head bolts.
I
Cylinder head bolts should be loosened in two or three
steps.
I
A warped or cracked cylinder head could result from
removing in incorrect order.
CYLINDER HEAD
Disassembly (Cont’d)
EM-40
SEM863E
7.
Remove cylinder head.
SEM861E
Inspection
NHEM0019
CYLINDER HEAD DISTORTION
NHEM0019S01
Clean surface of cylinder head.
Use a reliable straightedge and feeler gauge to check the flatness
of cylinder head surface.
Check along six positions shown in the figure.
Head surface flatness: Limit 0.1 mm (0.004 in)
If beyond the specified limit, resurface or replace it.
The limit for cylinder head resurfacing is determined by the
cylinder block resurfacing.
Resurfacing limit:
Amount of cylinder head resurfacing is “A”.
Amount of cylinder block resurfacing is “B”.
The maximum limit: A + B = 0.2 mm (0.008 in)
After resurfacing cylinder head, check that camshaft rotates freely
by hand. If resistance is felt, cylinder head must be replaced.
Nominal cylinder head height:
126.3 - 126.5 mm (4.972 - 4.980 in)
SEM191F
CAMSHAFT VISUAL CHECK
NHEM0019S02
Check camshaft for scratches, seizure and wear.
CAMSHAFT RUNOUT
NHEM0019S03
1.
Measure camshaft runout at A and B as shown in the figure.
Runout (Total indicator reading):
Limit 0.05 mm (0.0020 in)
2.
If it exceeds the limit, replace camshaft.
SEM549A
CAMSHAFT CAM HEIGHT
NHEM0019S04
1.
Measure camshaft cam height.
Standard cam height:
Intake 43.940 - 44.130 mm (1.7299 - 1.7374 in)
Exhaust 44.465 - 44.655 mm (1.7506 - 1.7581 in)
Cam wear limit:
0.2 mm (0.008 in)
2.
If wear is beyond the limit, replace camshaft.
GI
MA
LC
EC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
CYLINDER HEAD
Disassembly (Cont’d)
EM-41
SEM862E
CAMSHAFT JOURNAL CLEARANCE
NHEM0019S05
1.
Install camshaft bracket and tighten bolts to the specified
torque.
2.
Measure inner diameter “A” of camshaft bearing.
Standard inner diameter:
No. 1: 26.000 - 26.021 mm (1.0236 - 1.0244 in)
No. 2, 3, 4: 23.500 - 23.521 mm (0.9252 - 0.9260 in)
SEM012A
3.
Measure outer diameter of camshaft journal.
Standard outer diameter:
No. 1: 25.935 - 25.955 mm (1.0211 - 1.0218 in)
No. 2, 3, 4: 23.445 - 23.465 mm (0.9230 - 0.9238 in)
4.
If clearance exceeds the limit, replace camshaft and/or cylin-
der head.
Camshaft journal clearance:
Standard
No. 1: 0.045 - 0.086 mm (0.0018 - 0.0034 in)
No. 2, 3, 4: 0.035 - 0.076 mm (0.0014 - 0.0030 in)
Limit
0.15 mm (0.0059 in)
SEM864E
CAMSHAFT END PLAY
NHEM0019S06
1.
Install camshaft in cylinder head.
2.
Measure camshaft end play.
Camshaft end play:
Standard
0.115 - 0.188 mm (0.0045 - 0.0074 in)
Limit
0.24 mm (0.0094 in)
SEM865E
CAMSHAFT SPROCKET RUNOUT
NHEM0019S07
1.
Install sprocket on camshaft.
2.
Measure camshaft sprocket runout.
Runout (Total indicator reading):
Less than 0.15 mm (0.0059 in)
3.
If it exceeds the limit, replace camshaft sprocket.
CYLINDER HEAD
Inspection (Cont’d)
EM-42
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