Mercury MerCruiser D2.8L D-Tronic Service Manual page 326

ENGINE MECHANICAL
3. Measure rear main bearing clearance in the same manner as the center main bearings
(no assembly of carrier is required).
4. To check clearance of front main bearing:
a. Measure crankshaft front main bearing journal.
b. Measure I.D. of front main bearing in cylinder block as shown.
c. Calculate difference between measurement taken in step a. and b. (clearance) and
TIMING GEAR
1. Ensure timing gear teeth are not worn or damaged.
2. Remove slight indentations with a very fine grade Carborundum stone.
Page 3A-126
refer to specifications for maximum clearance.
SERVICE MANUAL NUMBER 22
70312
90-860074--1 FEBRUARY 2002