Piston diameter by size (NA8)

Piston diameter mm {in} Standard 82.954—82.974 {3.2660—3.2666} 0.25 {0.010} oversize 83.211—83.217 {3.2761—3.2762} 0.50 {0.020} oversize 83.461—83.467 {3.2859—3.2861}Piston diameter mm {in} Standard 82.954—82.974 {3.2660—3.2666} 0.25 {0.010} oversize 83.211—83.217 {3.2761—3.2762} 0.50 {0.020} oversize 83.461—83.467 {3.2859—3.2861}

Factory manualTaken from a Mazda factory workshop manual, with page citation.

Procedure

Measure at right angle to piston pin, 16.5 mm {0.650 in} below lower edge of oil-ring groove. Replace rings when replacing piston.

Applies to

NA 1994–1997 (BP) — Other years inferred from 1994 factory evidence.
Verified in: 1994 Mazda MX-5 Miata Workshop Manual

Sources (1)

View 1 source citations

1994 Mazda MX-5 Miata Workshop ManualTier 1
Page B–55 (PDF p. 92) · Printed value & notes
Page B–55 (PDF p. 92)
Printed: “Piston diameter mm {in} Standard 82.954—82.974 {3.2660—3.2666} 0.25 {0.010} oversize 83.211—83.217 {3.2761—3.2762} 0.50 {0.020} oversize 83.461—83.467 {3.2859—3.2861}”

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