Piston Ring: Service and Repair

End Gap


1. Using a piston, push a new ring into the cylinder bore 15-2O mm (0.6-0.8 in.) from the bottom.
2. Measure the piston ring end-gap with a feeler gauge:


- If the gap is too small, check to see if you have the proper rings for your engine.

- If the gap is too large, recheck the cylinder bore diameter against the wear limits. If the bore is over limit, the engine block must be rebored.


Piston Ring End-Gap:


Top Ring
Standard (New): 0.20-0.35 mm (0.008-0.014 in.)
Service Limit: 0.60 mm (0.02 in.)


Second Ring

Standard (New): 0.30-0.42 mm (0.012-0.017 in.)
Service Limit: 0.60 mm (0.02 in.)


Oil Ring

Standard (New): 0.2-0.9 mm (0.008-0.035 in.)
Service Limit: 1.1 mm (0.04 in.)



Alignment


1. Install the rings.




Note: Identify top and second rings by the chamfer on the edge, and make sure they are in proper grooves on piston.

2. Rotate the rings in grooves to make sure they do not bind.




3. The manufacturing marks must be facing upward




4. Position the ring end gaps as shown.