Mercury MerCruiser MCM 454 Mag MPI Service Manual page 140

MCM MODELS - BRAVO AND BLACKHAWK DRIVES WITH DRIVESHAFT EXTENSION
ENGINE MOUNT ADJUSTMENT WAS DISTURBED DURING SERVICE
NOTE: A Universal Protractor is recommended for measuring the angles in the following
steps.
IMPORTANT: In the following steps, the protractor readings will be taken off of
vertical and horizontal surfaces; therefore, both the 0 degree and the 90 degree
marks will be used. It should be kept in mind that these are reference marks only and
the assigned numbers should be ignored. It is only necessary to determine the
number of degrees and to which side (left or right) of the reference marks the
indicator needle rests. PROTRACTOR MUST BE VIEWED FROM THE SAME SIDE OF
POWER PACKAGE THROUGHOUT INSTALLATION.
1. Refer to SECTION 8F "Drive Shaft Models/Propeller Shaft," and remove drive shaft.
2. Position base of protractor against input shaft flange, as shown. NOTE and RECORD
the number of degrees and to which side of the reference mark the indicator needle has
moved in the following chart.
IMPORTANT: Be sure that boat does not move once reading has been taken from
input shaft flange, as this reading establishes a reference point for aligning drive
shaft and engine following. If boat is moved, reference point may be altered and
improper drive shaft and engine alignment may occur. Alignment tool MUST BE in
place during entire alignment procedure if drive unit is not installed.
NOTE: For ease of installation we recommend the use of a chain leveler in the following
steps.
Index
Page 2B-8
Downloaded from https://needmanual.com/
a
a - Reference Marks
Reading from Step 1.
a - Indicator Shaft Flange
b - Protractor
c - Indicator Needle
a
degrees to the side of reference mark.
b
a
c
SERVICE MANUAL NUMBER 23
72429
72592
90-861326--1 MARCH 1999