Check The Camshafts For Wear; Checking The Camshafts And Camshaft Journals For Wear; Eccentricity Of The Camshaft - SHERCO 250 SEF-R Workshop Manual

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
camshaft journals for wear
 Measure
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 camshasft runout.
If it is out of tolerance, replace the camshaft.
Runout : Less than 0.03 mm
camshafts
clearance between
and
the
15