Volvo Penta 230 Workshop Manual page 86

Piston rings
249. Remove the piston rings with piston ring pliers.
Remove all carbon deposits. Use a groove cleaning
tool to clean the piston ring grooves. A broken off
piston ring, ground to shape, can also be used.
Check carefully for damage, wear and cracks.
250. Check the axial wear of the piston rings. Use
new piston rings.
Upper compression ring .................. 0.060–0.092 mm
Lower compression ring .................. 0.040–0.072 mm
Oil scraper ring ............................... 0.030–0.065 mm
84
(0.00236–0.00362")
(0.00157–0.00283")
(0.00118–0.00256")
251. When measuring the piston ring gap, the piston
ring should be inserted into the cylinder. Use a pis-
ton, upside down to correctly position the piston
ring. Measure the gap with the ring 15 mm (0.591")
above the lower edge of the cylinder. Use a feeler
gauge.
Upper compression ring ...................... 0.30–0.55 mm
Lower compression ring ...................... 0.30–0.55 mm
Oil scraper ring ................................... 0.30–0.60 mm
The piston pin
252. Check the clearance for the piston pin in the
piston. The fit is correct when the piston pin can be
pushed by the thumb though the piston pin hole with-
out any noticeable play.
(0.0118–0.0217")
(0.0118–0.0217")
(0.0118–0.0236")