Connecting Rod / Piston Assembly; Measuring Rod Bearing Clearance - Mercury MerCruiser D2.8L D-Tronic Service Manual

ENGINE MECHANICAL

Connecting Rod / Piston Assembly

Measuring Rod Bearing Clearance

1. Remove oil pan and oil pick-up tube assembly.
2. Turn crankshaft to gain access to connecting rod bolts.
3. One cylinder at a time, remove rod caps and inspect bearings. Refer to Bearing Failure.
4. Measure crank pin with a micrometer for out-of-round, taper, or excessive wear. If not
within specifications, replace or recondition crankshaft.
5. Measure new or used bearing clearances with Plastigage or its equivalent as follows:
a. Clean oil from crank pin.
b. Install bearing in connecting rod.
c. Place a piece of gauging plastic the full width of crank pin (parallel to crankshaft).
d. Install rod cap with bearing. Torque bolts to 29.4 Nm + 60 degrees (21 lb-ft + 60
IMPORTANT: Do NOT turn crankshaft while gauging plastic is in place.
e. Remove rod cap and, using scale on gauging plastic envelope, measure gauging
Typical
Page 3A-106
degrees).
plastic width at widest point.
a - Compressed Gauging Plastic
b - Graduated Scale
b
a
90-860074--1 FEBRUARY 2002
SERVICE MANUAL NUMBER 22
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