Inspecting the cam shaft
- Inspect the cam shaft for signs of abnormal wear
on the cams.
Characteristic
Standard diameter - Bearing A:
Ø 12 +0.002 +0.010
mm Standard diameter - Bearing B:
Ø 16-0.015 -0.023 mm
Minimum diameter allowed - Bearing A:
Ø 11.98 mm
Minimum diameter allowed - Bearing B:
Ø 15.96 mm
- If any of the above dimensions are outside the
specified limits, or there are signs of excessive
wear, replace the defective components with new
ones.
N.B.
A BALL BEARING IS FITTED ON BEARING «A»; CONSE-
QUENTLY, BEARING «B» IS THE MOST IMPORTANT AS IT
WORKS DIRECTLY ON THE HEAD ALUMINIUM
Characteristic
Standard height - Intake:
25.935 mm
Standard height - Discharge:
25.935 mm
Fitting clearance
Maximum admissible axial clearance 0.5 mm
- Check there are no signs of scoring or wear on
the rocking lever bolt.
- Measure the diameter «A».
- Measure the internal diameter of each rocking
lever. level «B».
Check there are no signs of wear on the pad from
contact with the cam and on the jointed adjustment
plate.
- In case of anomalies, replace the damaged com-
ponents.
Characteristic
Engine ET4 50
ENG - 94
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