PRE-RELEASE
Piston rings
| Piston rings |
| Fitting in a new or rebored cylinder |
| 1. |
Push the piston rings down into the cylinder one by one, using a piston to position them correctly.
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| 2. |
Measure the ring gap with a feeler gauge. If necessary, widen the gap with a special file.
For measurements, see
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| Matching to a worn cylinder |
Piston rings for a worn cylinder should be matched in the same way as for a new or rebored cylinder, but they must be tried at the lower limit of piston travel because the bore is narrowest at this point.
| Fitting piston rings on pistons |
Use a piston ring expander when fitting rings on the piston. The bottom compression ring should be fitted with the side marked "top" uppermost. Check the fit of the piston rings in their grooves by rolling them round the groove. Also, measure the clearance at several points.
Oil the piston and rings before assembly. Turn the compression rings so that their gaps are 180° to each other and position each of them above one of the gudgeon pin holes. Also make sure that the gaps in the top and bottom rings of the three-part scraper ring are staggered round the piston and not in line with each other.
