Mercury MerCruiser MCM 454 Mag MPI Service Manual page 212

454 CID (7.4L) / 502 CID (8.2L)
454 Mag / 502 Mag / 8.2L (Except 7.4L MPI L-29) Engine Specifications
(Continued)
PISTON RING
Com ression Compression
Index
Page 3A-8
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MODEL
Groove Side
Clearance
Gap
Groove Side
Clearance
Oil O
Gap
.0017-.0032
Top
(0.044-0.081)
Production Production
.0017-.0032
2nd
(0.044-0.081)
High Production Limit + .010
Service
Top
(0.25-0.46)
Production Production
2nd
(0.41-0.61)
High Limit Production + .010
Service
Production
Service
Production +
.001 (0.25)
Production
(0.508-0.889)
Service
Production +
.001 (0.25)
SERVICE MANUAL NUMBER 23
454 MAG 502 MAG / 8.2L
.0017-.0032
(0.044-0.081)
.0017-.0032
(0.044-0.081)
(0.02) Max
.010-.018 .011-.021
(0.28-0.53)
.016-.024 .016-.026
(0.41-0.66)
(0.25) Max
.0050-.0065 (0.127-0.165)
High Limit
High Limit
Production
.005 (0.12)
Max
.020-.035 .010-.030
(0.254-0.76)
High Limit
High Limit
Production
.005 (0.12)
Max
90-861326--1 MARCH 1999