Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSACURA20043.5RLREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE MECHANICALMECHANICAL3.5L V6 ENGINEOVERHAULCYLINDER BLOCK ASSEMBLYPISTON RINGS
2004 Acura 3.5RL
Piston Rings
2004 Acura 3.5RLSECTION Piston Rings
- Using inverted piston, push NEW piston ring into cylinder bore 0.6-0.8" (15-20 mm) from bottom. Using a feeler gauge, measure ring end gap. If gap is too large, check cylinder bore diameter and re-bore if necessary. See PISTONS, PINS & RINGS table under ENGINE SPECIFICATIONS. If gap is too small, check if ring size is correct.
- Clean piston ring grooves thoroughly. Install rings onto piston with identification mark toward top of piston. Using a feeler gauge, measure side clearance between ring and ring groove.
- If ring grooves are excessively worn, replace piston. See PISTONS, PINS & RINGS table under ENGINE SPECIFICATIONS. Ensure piston ring end gaps are properly spaced around piston. See Fig 1.
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.