Inspection Of Piston And Piston Ring - Rotax 125 MAX evo Repair Manual

INSPECTION OF PISTON AND PISTON RING

Instructions See
1. Inspect the piston for cracks and signs of piston seizure.
2. Inspect the bore of the piston pin for damage and wear.
3. Inspect the piston pin ring groove for defects.
4. Check free of movement of the piston ring in the ring groove.
N N O O T T E E
If carbon prevents free movement of the piston ring, the ring groove can be
cleaned out with a discarded piston ring.
5. Measure the piston ring clearance in the ring groove with a feeler gauge (1).
N N O O T T E E
If the piston ring clearance has reached the wear limit of 0.1 mm, the piston must
be replaced.
6. Remove the piston ring from the piston, insert it approx. 10 mm from top into the cylinder
(use the piston to do so) and check ring-end gap by means of a feeler gauge.
7. Measure clearance with a feeler gauge.
N N O O T T E E
If the wear limit of 0.8 mm has been reached the piston ring must be replaced.
8. Check the piston ring locking pin for wear.
Figure 4.11: Piston and piston ring
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Chapter 4
Page 12
BRP-Rotax
REPAIR MANUAL
Figure: Piston and piston
Feeler gauge
1
ring.
Piston ring
2
Effectivity: 125 MAX evo, Junior MAX
evo, Mini MAX evo, Micro MAX evo
Edition - February 01 2018 /Rev. 0