454
CID (7.4L) / 502 CID (8.2L)
SERVICE MANUAL NUMBER 23
3.
When finish-honing a cylinder bore to fit a piston, move hone up and down at a sufficient
speed to obtain very fine uniform surface finish marks in a crosshatch pattern of approxi-
mately 30 degrees to cylinder bore. Finish marks should be clean but not sharp, free
from imbedded particles and torn or folded metal.
4.
Permanently mark piston (for cylinder to which it has been fitted) and proceed to hone
cylinders and fit remaining pistons.
IMPORTANT: Handle pistons with care and do not attempt to force them through
cylinder until cylinder is honed to correct size, as this type piston can be distorted
by careless handling.
5.
Thoroughly clean cylinder bores with hot water and detergent. Scrub thoroughly with a
stiff bristle brush and completely rinse with hot water. It is extremely essential that a good
cleaning operation be performed. If any abrasive material remains in cylinder bores, it
will rapidly wear new rings and cylinder bores in addition to bearings lubricated by the
contaminated oil. Swab bores several times with light engine oil on a clean cloth, then
wipe with a clean dry cloth. Cylinder should not be cleaned with kerosene or gasoline.
Clean remainder of cylinder block to remove excess material spread during honing
operation.
PISTON SELECTION
1.
Check used piston to cylinder bore clearance as follows:
a. Measure cylinder bore diameter with a telescope gauge 2-1/2 in. (64 mm) from top
of cylinder bore as follows.
72570
b. Measure piston diameter at skirt across centerline of piston pin as shown.
72624
c. Subtract piston diameter from cylinder bore diameter to determine piston-to-bore
clearance.
d. Determine if piston-to-bore clearance is in acceptable range shown in “Specifica-
tions.”
Index
Page 3A-84
90-861326--1 MARCH 1999
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 454 CID, Mercury MerCruiser 502 CID |
| Model Year | 1998, 1999, 2000, 2001 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
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Marine readers have rated Mercury MerCruiser GM V8 GM V8 454 CID 7.4L and 502 cid 8.2L Marine Engines Service Manual Number 23 5.0 out of 5.0 based on 1 product reviews. Just need the manual. Wrote review. Can't technically review what I haven't seen yet...