262
CID (4.3L) ENGINES
SERVICE MANUAL NUMBER 25
3.
Install the bearing cap and evenly torque the retaining bolts to specifications. Bearing
cap MUST be torqued to specification in order to assure proper reading. Variations in
torque affect the compression of the plastic gauge.
IMPORTANT: Do not rotate the crankshaft while the gauging plastic is between the
bearing and journal.
4.
Remove bearing cap. The flattened gauging plastic will be found adhering to either the
bearing cap or journal.
5.
On the edge of the gauging plastic envelope there is a graduated scale correlated in
thousandths of an inch. Without removing the gauging plastic, measure its compressed
width (at the widest point) with the graduations on the gauging plastic envelope.
b
a
72358
a - Compressed Gauging Plastic
b - Graduated Scale
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
maximum 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 bearing failure. If the flattened gauging plastic tapers toward the middle or ends, there
is a difference 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.
6.
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.
7.
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.
c. After selecting new bearing, recheck clearance.
8.
Proceed to the next bearing. After all bearings have been checked, rotate the crankshaft
to see that there is no excessive drag. When checking No. 1 main bearing, loosen
accessory drive belts to prevent tapered reading with plastic gauge.
Index
Page 3A-70
90-861328--1 NOVEMBER 1999
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 1262 CID, Mercury MerCruiser 262 CID |
| Model Year | 1998, 1999, 2000, 2001 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
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