Inspecting The Cam Shaft - Derbi Dirtboy 10 Workshop Manual

E E ENGINE
E N G I N E
I I
NSPECTING THE CAM SHAFT NSPECTING THE CAM SHAFT
- Ensure that the camshaft bearings are not abnormally
worn.
- If any measurements or values are not as specified, pro-
ceed to replace the defective parts.
N.B.
A BALL BEARING IS PITTED ON BEARING «A»; CONSE-
QUENTLY, BEARING «B» IS MORE IMPORTANT BECAUSE IT
WORKS DIRECTLY ON THE ALUMINIUM OF THE CYLINDER
HEAD.
C
HARACTERISTIC
Standard diameter - Bearing A:
Ø 12+0,002+0,010 mm
Standard diameter - Bearing B:
Ø 16-0,015-0,023mm
Minimum allowable diameter - Bearing A:
Ø 11,98mm
Minimum allowable diameter - Bearing B:
Ø 15,96 mm
Standard height - Intake:
25,935 mm
Standard height - Exhaust:
25,935 mm
Maximum allowable axial play:
0,5 mm
- Ensure that the rocker arm pivot is not worn or scored.
- Measure diameter «A».
- Measure the inside diameter of each rocker arm «B».
- Check that the cam contact shoe and the adjuster articula-
ted cap are not worn.
34
- CYLINDER ASSY. AND TIMING SYSTEM
- CYLIND ER AS SY. A N D TI MIN G SYST EM