PISTON PINS
•
Notch or valve relief in piston must be posi-
tioned correctly for engine that is being re-
paired.
1.
Piston pin clearance is designed to maintain ade-
quate clearance under all engine operating con-
ditions. Because of this, piston and piston pin are
a matched set and not serviced separately.
2.
Inspect piston pin bores and piston pins for
wear. Piston pin bores and piston pins must be
free of varnish and scuffing when measured.
Measure piston pin with a micrometer and pis-
ton pin bore with a dial bore gauge or inside mi-
crometer. If clearance is in excess of the .001 in.
a
(0.025
mm) wear limit, replace piston and piston
pin assembly.
Reassembly
IMPORTANT: When reassembling pistons and
connecting rods, the following must be kept in
mind.
•
Piston and pin are machine fitted to each oth-
er and must remain together as a matched
set. Do not intermix pistons and pins.
72554
7.4L Engine
a - Notch - Toward Front Of Engine
•
If original pistons and/or connecting rods are
being used, be sure to assemble pistons and
connecting rods so they can be reinstalled in
same cylinder from which they were re-
moved.
a
•
Connecting rod bearing tangs are always to-
ward outside of cylinder block.
72553
a
454
Magnum / 502 Magnum / 8.2L
a - Valve Relief - Toward Center Of Engine
72368
a - Rod Bearing Tangs
Index
90-823224--2
796
454 CID (7.4L) / 502 CID (8.2L) - 3A-51
| 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