5-30 ENGINE TOP END
Camshafts, Camshaft Chains, Camshaft Sprockets
Camshaft, Rocker Case Wear
Remove the rocker cases (see Rocker Case Removal).
Cut strips of plastigage to journal width. Place a strip
on each journal parallel to the camshaft installed in the
Measure each clearance between the camshaft journal
and the rocker case using plastigage (press gauge).
Tighten the rocker case bolts to the specified torque (see
Rocker Case Installation).
Do not turn the camshaft when the plastigage is be-
tween the journal and rocker case.
Remove the rocker case again, and measure the plasti-
gage width [A] to determine the clearance between each
journal and the rocker case. Measure the maximum plas-
Camshaft Journal/Rocker Case Clearance
0.020 ∼ 0.062 mm (0.0008 ∼ 0.0024 in.)
Service Limit: 0.15 mm (0.0059 in.)
If any clearance exceeds the service limit, measure the
diameter of each camshaft journal with a micrometer.
Camshaft Journal Diameter
25.959 ∼ 25.980 mm (1.0220 ∼ 1.0228 in.)
Service Limit: 25.93 mm (1.021 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
rocker case and cylinder head as a set.
The rocker case and cylinder head are machined in
the assembled state, so they must be replaced as a
Remove the camshaft (see Camshaft Removal).
Set the camshaft in a camshaft alignment jig or on V
Measure runout with a dial gauge at the specified place
If the runout exceeds the service limit, replace the shaft.
TIR 0.02 mm (0.0008 in.) or less
TIR 0.1 mm (0.004 in.)