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I
I
NSPECTING THE PISTON RINGS
NSPECTING THE PISTON RINGS
Version 125
Seal rings
- Insert each of the three piston rings in turn, inside the cylin-
der where it still maintains its original diameter, making sure
they are perpendicular to the cylinder axis.
- Measure the piston ring gap (see figure) using feeler gau-
ges.
- Replace piston rings exhibiting a gap exceeding the speci-
fied limit.
N.B.
BEFORE REPLACING THE LININGS, MAKE SURE THAT THE PRES-
CRIPTIONS RELATING TO THE SEALING RING - HOUSINGS
AND PISTON - CYLINDER COUPLING CLEARANCES ARE RES-
PECTED. IN ANY CASE, NEW SEALING RINGS COUPLED WITH
A SECOND-HAND CYLINDER MAY REQUIRE ADJUSTMENT
CONDITIONS DIFFERENT FROM STANDARD ONES.
Characteristic
1st lining
Standard opening:
0,15 ÷ 0,30 mm
2nd lining
Standard opening:
0,10 ÷ 0,30 mm
Scraper ring
Standard opening:
0,15 ÷ 0,35 mm
Version 250
Sealing rings
-Alternately insert the 3 sealing rings into the cylinder in the
zone where it has the original diameter. Insert the rings in
orthogonal position into the cylinder axle, using the piston.
- Measure the opening (see figure) of the sealing rings by a
thickness gauge.
- If higher values than those prescribed are measured, re-
place the linings.
111
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