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ENGINE TOP END 5-17
Camshaft, Camshaft Chain
Camshaft, Camshaft Cap Wear
•
Remove:
Camshaft Chain Guide
Camshaft Cap
•
Cut strips of plastigage to journal width. Place a strip
on each journal parallel to the camshaft installed in the
correct position.
•
Measure each clearance between the camshaft journal
and the camshaft cap using plastigage (press gauge) [A].
•
Tighten:
Torque - Camshaft Cap Bolts: 12 N·m (1.2 k gf·m, 104 in·lb)
Camsh
aft Chain Guide Bolts: 12 N·m (1.2 kgf·m,
104 in·lb)
NOTE
○
Do not turn the camshaft when the plastigage is be-
tween the journal and camshaft cap.
Camshaft Journal, Camshaft Cap Clearance
Standard: 0.028 ∼ 0.071 mm (0.0011 ∼ 0.0028 in.)
Service Limit: 0.16 mm (0.0063 in.)
If any clearance exceeds the service limit, measure the
diameter of each camshaft journal with a micrometer.
Camshaft Journal Diameter
Standard: 23.950 ∼ 23.972 mm (0.9429 ∼ 0.9438 in.)
Service Limit: 23.92 mm (0.942 in.)
If the camshaft journal diameter is less than the service
limit, replace the camshaft with a new one and measure
the clearance again.
If the clearance still remains out of the limit, replace the
cylinder head unit.
Camshaft Runout
•
Remove the camshaft.
•
Set the camshaft in a camshaft alignment jig or on V
blocks.
•
Measure runout with a dial gauge at the specified place
as shown.
If the runout exceeds the service limit, replace the shaft.
Camshaft Runout
Standard: TIR 0.02 mm (0.0008 in.) or less
Service Limit: TIR 0.1 mm (0.004 in.)
Cam Wear
•
Remove the camshaft.
•
Measure the height [A] of each cam with a micrometer.
If the cams are worn down past the service limit, replace
the camshaft.
Cam Height
Inlet Exhaust
Standard:
36.746 ∼ 36.854 mm 36.146 ∼ 36.254 mm
(1.4467 ∼ 1.4509 in.) (1.4231 ∼ 1.4273 in.)
Service
Limit:
36.65 mm 36.05 mm
(1.443 in.) (1.419 in.)