Valve Cover Area; Cylinder Area - Mercury MerCruiser D2.8L D-Tronic Service Manual

TROUBLESHOOTING

Valve Cover Area

1. Valve cover area, timed to one-half
engine speed, noise could be confined to
one cylinder or may be found in any
multitude of cylinders

Cylinder Area

1. Cylinder area, may be confined to one
cylinder or found in more than one
cylinder, timed to engine speed
2. Engine knocking
Page 1C-20
Location
Location
SERVICE MANUAL NUMBER 22
Possible Cause
1. A. Rocker arm striking valve cover
B. Hydraulic lifter
C. Worn rocker arm
D. Bent push rod
E. Worn camshaft
F. Sticking valve
Possible Causes
1. A. Sticking valve
B. Carbon build-up
C. Connecting rod installed wrong
D. Bent connecting rod
E. Piston
F. Piston rings
G. Piston pin
H. Cylinder worn
2. A. Faulty injector (white smoke)
B. Worn delivery valve
C. Wrong injection timing
D. Incorrect valve lifter
E. Tight piston pin
90-860074--1 FEBRUARY 2002