Valve Grinding
Reassembly
Valves that are pitted must be refaced to the proper
angle. Valve stems which show excessive wear, or
valves that are warped excessively, must be re-
placed. When a valve head which is warped exces-
sively is refaced, a knife edge will be ground on part
or all of the valve head, due to the amount of metal
that must be removed to completely reface. Knife
edges lead to breakage, burning, or pre-ignition due
to heat localizing on this knife edge. If the edge of the
valve head is less than 1/32 in. (0.8 mm) after grind-
ing, replace the valve.
1. Lubricate valve guides and valve stems with en-
gine oil.
2.
Install each valve in the port from which it was re-
moved or to which it was fitted.
3. Install valve rotators, shims, springs, seals, and
caps as shown under “Valve Assembly (Ex-
ploded View)” for each particular engine.
4.
Using valve spring compressor, compress valve
spring and install valve locks (grease may be
used to hold locks in place).
Several different types of equipment are available for
refacing valves. The recommendation of the man-
ufacturer of the equipment being used should be
carefully followed to attain proper results.
a
EXHAUST
INTAKE
a
a
72565
a - Valve Spring Compressor (J-8062)
b
b
50695
Exhaust
a - 372 In. (9.45 mm)
b - 1/32 [.031] In. (0.79 mm) Min.
Intake
a - 372 In. (9.45 mm)
b - 1/32 [.031] In. (0.79 mm) Min.
Index
90-823224--2
796
454 CID (7.4L) / 502 CID (8.2L) - 3A-33
| 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