4.
The deflection is the difference between these
two measurements. If the deflection exceeds 3/4
in. (19 mm), timing chain should be replaced.
1. Remove valve mechanism as outlined.
2.
Adapt dial indicator to cylinder head by tempo-
rarily installing suitable stud in bolt hole. Position
indicator with ball socket adaptor tool, from LiftIn-
dicator Tool Kit, on push rod. Be sure that push
rod is in lifter socket.
a
a
72946
72551
a - Lift Indicator Tool Kit (J-8520)
a - Reference Point
3.
4.
Rotate torsional damper slowly in direction of ro-
tation until lifter is on heel of cam lobe. At this
point, push rod will be in its lowest position.
5.
Install torsional damper and crankcase front
cover.
Set dial indicator on zero, then rotate damper
slowly (or attach an auxiliary starter switch and
“bump” engine over) until push rod is in fully
raised position.
Camshaft
5.
Compare total lift, recorded from dial indicator,
with “Specifications.”
Measuring Lobe Lift
NOTE:Procedure is similar to checking valve timing.
If improper valve operation is indicated, measure lift
of each push rod in consecutive order and record
readings.
6. Continue to rotate engine until indicator reads
zero. This will be a check on accuracy of original
indicator reading.
7.
If camshaft readings for all lobes are within speci-
fications, remove dial indicator assembly and
hardware.
8.
Install and torque valve mechanism to specifica-
tions.
Index
90-823224--2
796
454 CID (7.4L) / 502 CID (8.2L) - 3A-57
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 454 CID, Mercury MerCruiser 502 CID |
| Model Year | 1993, 1994, 1995, 1996, 1997 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
(4 votes, average: 4.5 out of 5)
Marine readers have rated 1993 1997 Mercury-MerCruiser GM V8 454 CID 7.4L and 502 CID 8.2L Marine Engines Service Manual Number 16 4.5 out of 5.0 based on 4 product reviews. Hugely helpful service manual! Perfect. Thank you!
Manuals are all Important for Technician
This book is invaluable if you do your own repairs. Great book.
Could not find a copy until a search brought me here.
Excellent print.
Thank you