RSX L4-2.0L (2005)
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 to fit the piston grooves. The top and 2nd ring
grooves are 1.2 mm (0.05 inch) wide. The oil ring groove is 2.0 mm (0.08 inch) 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, push a new ring (A) into the cylinder bore 15 - 20 mm (0.6 - 0.8 inch) 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 over the service limit, the engine block must be
rebored.
Piston Ring End-Gap
Top Ring:
Standard (New): 0.20 - 0.35 mm (0.008 - 0.014 inch)
Service Limit: 0.60 mm (0.024 inch)
Second Ring:
K20A3 Engine:
Standard (New): 0.40 - 0.55 mm (0.016 - 0.022 inch)
Service Limit: 0.70 mm (0.028 inch)
K20A2, K20Z1 Engines:
Standard (New): 0.50 - 0.65 mm (0.020 - 0.026 inch)
Service Limit: 0.75 mm (0.030 inch)
Oil Ring:
K20A3 Engine:
Standard (New): 0.25 - 0.65 mm (0.010 - 0.026 inch)
Service Limit: 0.75 mm (0.030 inch)
K20A2, K20Z1 Engines:
Standard (New): 0.20 - 0.70 mm (0.008 - 0.028 inch)
Service Limit: 0.80 mm (0.031 inch)
