RDX L4-2.3L Turbo (2008)
Piston Ring: Service and Repair
Piston Ring Replacement
1. Remove the piston from the engine block.
2. Using a ring expander (A), remove the old piston rings (B).
3. Clean all ring grooves thoroughly with a squared off broken ring or ring groove cleaner with a blade that fits the piston grooves.
The top ring groove is 1.5 mm (0.06 in.) wide. The 2nd ring groove is 1.2 mm (0.05 in.) wide. The oil ring groove is 2.0 mm (0.08 in.) wide.
File down a blade if necessary.
Do not use a wire brush to clean the ring grooves, or cut the ring grooves deeper with the cleaning tools.
NOTE: If the piston is to be separated from the connecting rod, do not install new rings yet.
4. Using a piston that has its rings removed, push a new ring (A) into the cylinder bore 15-20 mm (0.6-0.8 in.) from the bottom.
5. Measure the piston ring end-gap (B) with a feeler gauge:
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If the gap is too small, check to see if you have the proper rings for your engine.
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If the gap is too large, recheck the cylinder bore diameter against the wear limits. If the bore is beyond the service limit, the engine block must
be rebored.
Piston Ring End-Gap
Top Ring:
Standard (New): 0.20-0.30 mm (0.008-0.012 in.)
Service Limit: 0.60 mm (0.024 in.)
Second Ring:
Standard (Now): 0.40-0.50 mm (0.016-0.020 in.)
Service Limit: 0.75 mm (0.030 in.)
Oil Ring:
Standard (Now): 0.10-0.30 mm (0.004-0.012 in.)
Service Limit: 0.80 mm (0.031 in.)
