Mercury MerCruiser MCM 454 Mag MPI User Manual

454 CID (7.4L) / 502 CID (8.2L)
SERVICE MANUAL NUMBER 23
Page 3A-13
90-861326--1 MARCH 1999
7.4L MPI (L-29) Engine Specifications (Continued)
PISTON RING
MODEL 7.4L
Groove Side
Production 2nd .0012-.0029 (0.0304-0.0737)
Groove
Side
Clearance
Service
High Production Limit + .010
(0.254) Max
Compression
Production
Top .010-.018 (0.254-0.457)
Gap
Production
2nd .016-.024 (0.406-0.6096)
Ga
Service
High Limit Production + .010
(0.254) Max
Groove Side
Production .0050-.0065 (0.1270-0.1651)
Oil
Groove
Side
Clearance
Service
High Limit Production + .001
(0.0254)
Oil
Production .010-.030 (0.254-0.762)
Gap
Service
High Limit Production + .001
(0.0254)
PISTON PIN
MODEL 7.4L
Diameter .9895-.9897 (25.133-25.1383)
Clearance In
Production .0002-.0007 (0.0051-0.0177)
Piston
Service .001 (0.0254) Max
Fit In Rod .0031-.0021 (0.0787-0.0533) Interference
VALVE SPRING
MODEL 7.4L
Free Length 2.12 (53.9)
Closed
1.838 in. (46.6850 mm) at 71-79 Lbs.
Valve S
p
ring
Pressure
Closed
()
(316-351 N)
Valve
S ring
Pressure
Open
1.3470 in. (34.2130 mm) at 238-262 Lbs.
(1059-1165 N)
Installed Height 1.8380 (46.6850) ± .07937 (2.015)
FLYWHEEL
MODEL 7.4L
Runout .008 (0.203) Max
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Index

Mercury MerCruiser MCM 454 Mag MPI Specifications

General

Brand	Mercury
Model	MerCruiser MCM 454 Mag MPI
Category	Engine
Language	English