Inspection
1. Put the camshafts, the camshaft holders and
holder pipes on the cylinder head, and then tighten
the bolts to the specified torque.
NOTE: Apply clean engine oil to 8 mm bolt threads.
Specified torque:
8 mm x 1.25 mm bolts:
22N.m (2.2 kg-m, 16 Ib-ft)
6 mm x 1.0 mm bolts:
10N.m (1.0 kg-m, 7 Ib-ft)
CAMSHAFT HOLDER BOLTS TORQUE
SEQNUENCE
FRONT:
REAR:
PLASTIGAGE STRIP
2. Seat the camshaft by pushing it toward left end of
cylinder head.
3. Zero the dial indicator against the left end, then push
the camshaft back and forth, and read the end play.
Camshaft End Play:
Standard (New): 0.05—0.15 mm
(0.002-0.006 in)
Service Limit: 0.5 mm (0.02 in)
4. Remove the bolts, then remove the camshaft
holders from the cylinder head.
Do not rotate the camshaft during inspection.
Remove the rocker arms and rocker shafts.
NOTE:
Lift camshaft out of cylinder head, wipe clean,
then inspect lift ramps. Replace camshaft if lobes
are pitted, scored, or excessively worn.
Clean the camshaft bearing surfaces in the
cylinder head, then set camshaft back in place.
Insert plastigage strip across each journal.
5. Install the camshaft holders, and then tighten the
bolts to the specified torque, as shown in the left
column on this page.
6. Remove the camshaft holders and measure widest
portion of plastigage on each journal.
Camshaft-to-Holder Oil Clearance:
Standard (New): 0.050-0.089 mm
(0.002-0.004 in)
Service Limit: 0.15 mm (0.006 in)
7. If camshaft-to-holder oil clearance is out of
tolerance:
Rotate camshaft
while measuring
8. Check cam lobe height wear.
Cam Lobe Height Standard (New):
M/T
A/T
EXHAUST
INTAKE
CYLINDER
NUMBER
REAR BANK
INTAKE
FRONT BANK CYLINDER
NUMBER
EXHAUST
Check this area for wear.
Cam position
P: Primary M: Mid S: Secondary
And camshaft has already been replaced, you
must replace the cylinder head.
If camshaft has not been replaced, first check to-
tal runout with the camshaft supported on V-
blocks.
Camshaft Total Runout:
Standard (New): 0.03 mm (0.0012 in)
Service Limit: 0.06 mm (0.0024 in)
If tne total runout of the camshaft is within toler-
ance, replace the cylinder head.
If the total runout is out of tolerance, replace the
camshaft and recheck. If the bearing clearance
is still out of tolerance, replace the cylinder head.