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ENGINE: CRANKSHAFT AND MAIN BEARINGS
CRANKSHAFT AND MAIN BEARINGS
MAIN SPECIFICATIONS
.
Checking and Grinding Crankpins and Journals
Flywheel and Ring Gear
, , ,
.
Checking Crankshaft Balance
,
.
Checking Crankpin and Journal Alignment
Cleaning Oil Passages.
Main Bearings . , ,
Checking End Play . .
Oil Seals,
.
Clutch Shaft Pilot Bushing
MAIN
SPECIFICATIONS
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DESCRIPTION
in
rom
Main bearing journal standard diameter
·
1.9994 to 2.0002
50.785 to 50.805
Main bearing saddle bore
2.1459 to 2.1465
,
54.507 to 54.520
Standard main bearing shell thickness .
·
.0721 to .0725
1.832 to 1.841
- -
Main bearing inserts for service
·
Std, .01-.02-.03-.04 U.5.
0.254-0 .50B-0.762-1.016
Crankpin journal standard diameter
·
1.5742 to 1.5750
39.985 to 40.005
Main bearing-to-journal:
- clearance of new parts
.
·
.0008 to .0024
0.020 to 0.066
-
wear
limit
.004
0.10
Length of center
main
bearing journal, shoulder-
to-shoulder
1.1055 to 1.l071
28.080 to 28.120
Width of center transverse
member,
between
thrust
ring
seats
.
.9149 to .9173
23.240 to 23.300
Center main bearing thrust ring thickness .
.0909 to .0929
2.310 to 2.360
Oversize thrust ring thickness
.0959 to .0979
2.437 to 2.487
Crankshaft end fit, thrust rings installed:
- clearance of new parts
.0024 to .0102
0.06 to 0.26
- wear limit
.014
0.35
Maximum misalignment of
main
bearing journals
.0020 (0)
0.05 (0)
-
Maximum misalignment of crankpins to main bear-
ing journals
±
.0197
±
0.5
-
Maximum out-of-round of crankpin and main bear-
ing journals, after grinding.
.0002
0.005
-
Maximum taper of crankpin and
main
bearing
journals, after grinding.
.0002
0.005
I
(conlinued)
(.) Total indicator reading.
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