30/ENGINE - WORK ON INDIVIDUAL PARTS 130
– Clean the piston ring groove.
Tip
Use an old piston ring to clean the piston ring groove.
– Check the piston rings for damage.
» If the piston ring is damaged:
– Change the piston ring.
Info
Mount the piston ring with the marking facing upward.
– Check the piston pin for discoloration or signs of wear.
» If the piston pin has strong discoloration/signs of wear:
– Change the piston pin.
– Insert the piston pin into the connecting rod and check the bearing for play.
» If the piston pin bearing has too much play:
– Change the connecting rod and the piston pin.
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– Measure the piston at the piston skirt, at right angles to the piston pin, at a dis-
tance .
Guideline
Distance 31.5 mm (1.24 in)
Piston - diameter
Size I 101.955… 101.965 mm (4.01397…
4.01436 in)
Size II 101.965… 101.975 mm (4.01436…
4.01476 in)
Info
Piston size is marked on the piston head.
19.14Checking piston ring end gap
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– Remove the piston ring from the piston.
– Place the piston ring in the cylinder and align it with the piston.
Guideline
Under the upper edge of the cylinder 10 mm (0.39 in)
– Measure the end gap with a feeler gauge .
Guideline
Piston ring end gap
Compression rings ≤ 0.80 mm (≤ 0.0315 in)
Oil scraper ring ≤ 1.00 mm (≤ 0.0394 in)
» If the end gap is more than the specified value:
– Check/measure the cylinder. ( p. 129)
» If the cylinder wear is within the tolerance range:
– Change the piston ring.
– Mount the piston ring with the marking facing toward the piston head.
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