SERVICE MANUAL NUMBER 23
454 CID (7.4L) / 502 CID (8.2L)
Installation
1.
2.
Apply Quicksilver Perfect Seal to engine block/seal mating surface. Apply grease to seal
lips.
Install seal using rear main seal installer or suitable device.
a
72356
a - Suitable Device Shown (Rear Main Seal Installer J-38841 Not Shown)
Main Bearings
IMPORTANT: Before removing main bearing caps or connecting rod caps, mark them
for reassembly in their original locations.
Main bearings are of the precision insert type and do not use shims for adjustment. If
clearances are found to be excessive, a new bearing, both upper and lower halves, will be
required. Service bearings are available in standard size and .001 in., .002 in., .010 in. and
.020
in. undersize.
Inspection
In general, the lower half of the bearing (except No. 1 bearing) shows a greater wear and
the most distress from fatigue. If, upon inspection, the lower half is suitable for use, it can
be assumed that the upper half is also satisfactory. If the lower half shows evidence of wear
or damage, both upper and lower halves should be replaced. Never replace one half without
replacing the other half.
Checking Clearances
To obtain accurate measurements while using Plastigage, or its equivalent, engine must be
out of the boat and upside down so crankshaft will rest on the upper bearings and total clear-
ance can be measured between lower bearing and journal.
To assure the proper seating of the crankshaft, all bearing cap bolts should be at their
specified torque. In addition, preparatory to checking fit of bearings, the surface of the
crankshaft journal and bearing should be wiped clean of oil.
IMPORTANT: Inspect bearing caps for orientation marks prior to removal. If no mark-
ings exist, make suitable marks before disassembly so that they can be reinstalled
in their original locations.
1.
With the oil pan and oil pump removed, make suitable marks, if required, on bearing
cap(s) to be inspected. Remove bearing cap(s) as needed. Wipe oil from journal and
bearing cap to be inspected.
Index
90-861326--1 MARCH 1999
Page 3A-61
| 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...