Mercury MerCruiser MCM 454 Mag MPI User Manual

TROUBLESHOOTING SERVICE MANUAL NUMBER 23
Page 1C-16
90-861326--1 MARCH 1999
Valve Cover Area
Location Possible Causes
Rocker arm striking valve cover
Valve cover area, timed to one-half engine
di ldb fid
Rocker arm out of adjustment
speed, noise could be confined to one
c
y
linder or ma
y
be found in an
y
multitude
Worn rocker arm
yy y
of cylinders
Bent push rod
Collapsed lifter
Cylinder Area
Location Possible Causes
Sticking valve
Carbon build-up
Connecting rod installed wrong
Cylinder area, may be confined to one
cylinder or found in more than one
Bent connecting rod
cylinder
or
found
in
more
than
one
cylinder, timed to engine speed
Piston
Piston rings
Piston pin
Cylinder worn
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Mercury MerCruiser MCM 454 Mag MPI Specifications

General

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