Piston Ring: Service and Repair

Piston rings are fitted as follows





A Top ring-compression
B Second ring-compression
C Bottom ring-oil control

NOTE: Both top and second rings have tapered peripheries and are marked 'TOP' to ensure correct fitting. In addition, the top ring has a chrome plated periphery and is also cargraph coated. This coating is colored RED and must not be removed. The bottom ring consists of an expander sandwiched between two rails.

- Check the piston ring gap in the bore.
- Push the ring to a point midway down the bore.
- Check that the ring is square and measure the gap-see Engine Data.
- Fit the bottom ring ensuring that the expander ends are not overlapping.
- Fit the second and top rings ensuring that they are fitted the correct way up.
- Position the rings so that the gaps are staggered around the periphery of the piston.
- Check the side clearance of the rings in the piston groove.