SHERCO 2015 450 SEF-R Workshop Manual page 27

Checking individual parts
Cams wear:
• Measure the height [A] of each cam by means
of a micrometer.
A
If the cams are worn beyond the limit, replace the
camshaft.
Cam height limit 450
Exhaust: 37.20 mm
Admission: 37.62 mm
Wear of the camshaft and camshaft bearings:
• Measure all clearances between the camshaft
A
trunnion and the camshaft bearings by means of
a plastic gauge [A]. Tighten the camshaft housing
screws after coating their body and threading with
engine oil.
Torque setting
Camshaft housing screws: 18 Nm.
If any clearance is above the limit, measure the
diameter of each camshaft trunnion by means of a
micrometer.
If the diameter of the camshaft pin is below the
limit, replace the camshaft and measure the clea-
rance again.
Diameter of the standard camshaft trunnion:
23.980 – 23.993 mm
Limit: 23.960 mm
If the clearance remains outside the service limit,
replace the cylinder head.
Camshaft offset:
Measure the runout of the camshaft.
If it is out of specification, change the camshaft.
Runout: Less than 0.03 mm.
27