Mercury MerCruiser MCM 454 Mag MPI Service Manual page 142

MCM MODELS - BRAVO AND BLACKHAWK DRIVES WITH DRIVESHAFT EXTENSION
8. Relieve hoist tension from engine, then slide engine fore or aft as needed to obtain 1/4
in. (6.4 mm) between flange shoulder and extension shaft housing bearing, as shown.
9. Position engine for correct engine and drive shaft lateral alignment as follows:
a. Measure the length of "a" and "b" to the centers of bolt holes. They MUST BE
These Dimensions Must Be Equal
b. Recheck Step 8. If Step 8 is not as specified, adjust and recheck Step 9a. Continue
Index
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a - Flange Shoulder
b - Bearing
c - 1/4 In. (6 mm)
EQUAL. If they are not equal, slide the aft and forward ends of the engine equal
amounts in opposite directions to obtain equal lengths for "a" and "b."
this process until both Steps 8 and 9a are as specified.
SERVICE MANUAL NUMBER 23
c
b
a
a
b
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