pag. 48
Engine TRE 0701-TRE 0702-TRE 0801
Service manual
12 - To check the wear in the compression rings,
insert them one at a time into the cylinder (32) by
about 10-15 mm and measure the gap between
the two ends with a feeler gauge (34); the rings must
be replaced if the gap is more than 0.8 mm.
NOTE - If a gap of more than 0.6 mm is measu-
red with new rings it means that the cylinder is
worn beyond the acceptable limits and must
be replaced. The cylinder must be replaced
if it shows striping due to a seizure.
13 - Use a section of an old ring (35) to carefully
clean the inside of the piston (31) ring housings, en-
suring that the oil passage holes are not blocked.
14 - To check the wear in the piston ring housings,
t a new ring and measure the residual space with
a feeler gauge (36). The piston must be replaced
if it is greater than 0.15 mm in the two compression
ring housings.
15 - Use a screwdriver to remove the clamping ring
(37) and remove the gudgeon pin (38) from the
piston (31).
11. ENGINE BLOCK - Overhauling internal parts
34
35
31
36
37
38
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