SERVICE MANUAL NUMBER 30
496 CID (8.1L)
NOTE: Normally main bearing journals wear evenly and are not out of round. However, if
a bearing is being fitted to an out-of-round journal (.001 in. max.), be sure to fit to the maxi-
mum diameter of the journal. If the bearing is fitted to the minimum diameter, and the journal
is out of round .001 in., interference between the bearing and journal will result in rapid bear-
ing failure. If the flattened gauging plastic tapers toward the middle or ends, there is a differ-
ence in clearance indicating taper, low spot or other irregularity of the bearing or journal. Be
sure to measure the journal with a micrometer if the flattened gauging plastic indicates more
than .001 in. difference.
7.
If the bearing clearance is within specifications, the bearing insert is satisfactory. If the
clearance is not within specifications, replace the insert. Always replace both upper and
lower inserts as a unit.
8.
A standard or .001 in. undersize bearing may produce the proper clearance. If not, it will
be necessary to regrind the crankshaft journal for use with the next undersize bearing.
9.
Repeat steps 1-7 for each bearing cap.
10.
11.
After all bearings have been checked, rotate the crankshaft to check for drag.
Measure crankshaft end play by forcing the crankshaft to the extreme front position.
Measure at the front end of the rear main bearing with a feeler gauge.
a
76754
a - Feeler Gauges
Installation
NOTE: Main bearings may be replaced with or without removing crankshaft.
a
b
c
72359
a - Lower Bearing Insert (Install In Cap)
b - Upper Bearing Insert (Install In Block)
c - Oil Groove
90-863161 SEPTEMBER 2000
INDEX
Page 3A-57
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 496 CID |
| Model Year | 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
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