Mercury MerCruiser MCM 454 Mag MPI Service Manual page 141

SERVICE MANUAL NUMBER 23
3. Adjust engine mounts so that an equal amount of up and down adjustment exists.
4. Attach a suitable lifting chain to lifting eyes on engine and adjust so that engine will be
5. Refer to SECTION 8F "Drive Shaft Models/Propeller Shaft," and install drive shaft while
Engine MUST BE aligned correctly to achieve proper engine operation and to
prevent damage to drive shaft. If drive shaft is run at an incorrect angle, damage to
universal joint bearings may result.
6. Position base of protractor on drive shaft. Then raise or lower engine (as boat
7. Adjust stringer height so that the stringers just contact the engine mount bases.
Failure to properly position output shaft flange (as described following) may result
in bearing damage.
Index
90-861326--1 MARCH 1999
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MCM MODELS - BRAVO AND BLACKHAWK DRIVES WITH DRIVESHAFT EXTENSION
level when suspended. Then; place engine into its approximate position (in boat) using
an overhead hoist.
observing "Precautions" in SECTION 8D, especially about aligning gimbal bearing
U-joint centerlines with extension drive shaft U-joint centerlines at bearing support input
shaft. DO NOT install shields at this time.
construction permits) until indicator needle is 1 degree to 3 degrees on either side of
reading taken in Step 1. Record this reading in the following chart for later use.
a
a - Drive Shaft
b - Protractor
c - Output Shaft Flange
Reading from Step 6.
CAUTION
b
c
degrees to the side of reference mark.
CAUTION
70238
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