Camshaft Check; Limits Allowed - PIAGGIO 500 cc Service Manual

Camshaft check

- Check that the camshaft supports show no signs of
anomalous wear or scoring.
- Measure the camshaft supports by means of a mi-
crometer.
Standard diameter
Support A Ø: 42 - 0.060 mm
- 0.085
Support B Ø: 20 - 0.020 mm
- 0.041
Minimum allowed diameter
Support A Ø: 41.910 mm
Support B Ø: 19.940 mm
- Check the cams heights by means of a gauge
Standard height
Intake: 33.988 mm
Exhaust: 33.417 mm

Limits allowed

Intake: 33.740 mm
Exhaust: 33.170 mm
Standard end play: 0 - 0.22 mm
Maximum allowed end play: 0.3 mm
- Replace the defective parts in case of anomalous
wear or values different from those prescribed.
- Check that the groove shown in the figure, seat of the
stop plate, shows no signs of wear.
- Check that the automatic valve lifter cam, the stop
roller and the rubber stop on the containment bell
show no signs of wear.
- Check that the valve lifter spring is not overstressed.
- Replace any worn parts.
- Check that the equalizer pins show no signs of
scoring or wear
Standard diameter: Ø 13
- Check the inside diameter of each equalizer.
Standard diameter: Ø 13
- Check that the cam sliding shoe and the registers
articulated plate show no signs of wear.
- Replace the component if necessary.
7 - 20
- 0.010
mm
- 0.018
+ 0.026 mm
+ 0.015
Thermal unit and timing system
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