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 MANUALSACURA1999NSX V6-3.2L DOHC (VTEC)REPAIR AND DIAGNOSISSPECIFICATIONSMECHANICAL SPECIFICATIONSENGINECYLINDER BLOCK ASSEMBLYPISTON, ENGINE
1999 Acura NSX V6-3.2L DOHC (VTEC)
Piston, Engine
1999 Acura NSX V6-3.2L DOHC (VTEC)SECTION Piston, Engine
NOTE: There are two standard-size pistons (A = no letter and B). The letter is stamped on the top of the piston. These letters are also stamped on the block as cylinder bore sizes.
M/T:
Piston A (no letter) Diameter
Standard (New): 92.990 - 93.003 mm (3.6610 - 3.6615 inch)
Service Limit: 92.97 mm (3.6602 inch)
Piston B Diameter
Standard (New): 92.980 - 92.993 mm (3.6606 - 3.6611 inch)
Service Limit: 92.96 mm (3.6598 inch)
A/T:
Piston A (no letter) Diameter
Standard (New): 89.986 - 90.004 mm (3.5427 - 3.5435 inch)
Service Limit: 89.97 mm (3.5421 inch)
Piston B Diameter
Standard (New): 89.976 - 89.994 mm (3.5424 - 3.5431 inch)
Service Limit: 89.96 mm (3.5417 inch)
Piston-to-Block Clearance:
M/T:
Standard (New): 0.007 - 0.030 mm (0.0002 - 0.0012 inch)
Service Limit: 0.0785 mm (0.0031 inch)
A/T:
Standard (New): 0.006 - 0.034 mm (0.0002 - 0.0014 inch)
Service Limit: 0.0825 mm (0.0032 inch)
Oversize Piston Diameter (A/T)
0.25: 90.226 - 90.244 mm (3.5522 - 3.5529 inch)
0.50: 90.476 - 90.494 mm (3.5620 - 3.5627 inch)
RENDER: 1.0x
NO RELATED
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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.