Release 00 - 11/2018
page 48
Engine WBE 170
Workshop Manual
10 - To check the wear in the compression rings,
insert them one at a time into the cylinder (22) by
about 10-15 mm and measure the gap between
the two ends with a feeler gauge (25); the rings
must be replaced if the gap is more than 1,0 mm.
NOTE - If a gap of more than 0.4 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.
11 - Use a section of an old ring (26) to carefully
clean the inside of the piston (21) ring housings,
ensuring that the oil passage holes are not blocked.
12 - To check the wear in the piston ring housings,
t a new ring and measure the residual space with
a feeler gauge (27). The piston must be replaced
if it is greater than 0.15 mm in the two compression
ring housings.
13 - Use a screwdriver to remove the clamping ring
(28) and remove the gudgeon pin (29) from the
piston (21).
16. ENGINE BLOCK - Overhauling internal parts
25
26
21
21
27
28
29
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