Mercury MerCruiser MCM 454 Mag MPI Service Manual page 266

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454 CID (7.4L) / 502 CID (8.2L)

2. Place a piece of gauging plastic the full width of the bearing (parallel to the crankshaft)

on the journal as shown.

IMPORTANT: Do not rotate the crankshaft while the gauging plastic is between the

bearing and journal.

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.

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 which is corre-

lated in thousandths of an inch. Without removing the gauging plastic, measure its com-

pressed width (at the widest point) with the graduations on the gauging plastic envelope

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

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Gauging Plastic

Compressed Gauging Plastic

Graduated Scale

SERVICE MANUAL NUMBER 23

90-861326--1 MARCH 1999

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