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Check the camshafts for wear:
• Remove the camshafts.
• Measure the heights [A] of the camshaft
lobes with a micrometer.
If the cams are worn beyond the limits, replace
the cams.
Camshaft height limit 250
Exhaust: 31.245 mm
Intake: 32.145 mm
Camshaft height limit 300
Exhaust: 31.977 mm
Intake: 32.145 mm
Checking the camshafts and camshaft journals
for wear:
• Measure the clearance between the
camshaft and the camshaft journals using
plastigage [A].
Lubricate the fixing bolts with engine oil and
tighten to the proper torque.
Tightening torque
Camshaft journal mounting bolts: 10 Nm
If any of the measurements are over the limit,
then measure the diameter of each journal.
Camshaft / journal clearance
Standard: 0.020 – 0.062 mm
Limit: 0.15 mm
If the diameter of the journal is below the limit
replace the camshaft and measure again.
Camshaft journal diameter
Standard: 23.05 – 23.25 mm
Limit 23.02 mm
If the clearance is outside of the tolerance
limits, replace the entire cylinder head.
Eccentricity of the camshaft:
Measure the camshaft runout.
If it is out of tolerance, replace the camshaft.
Runout: Less than 0.03 mm
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