Twin Disc MG-5170DC, Service Manual

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Twin Disc, Incorporated
Installation
Marine Transmission Service Manual #1020667
Figure 145. Checking Output Flange Pilot Eccentricity
Some boats are not structurally rigid and some carry their load in such a way
that they will “hog” or go out of normal shape with every loading and unloading.
Where this condition exists, it important to apply common sense alignment
techniques to minimize the potential damage to any of the components.
During the process of securing final alignment, it may be necessary to shift the
engine many times. When the final alignment is accomplished, mark and drill
the holes for the lag studs or locating dowel pins. Then with final alignment
secured, make up the necessary poured, steel, or hardwood shims, and
fasten the engine and transmission in place. Then recheck the alignment, and
if satisfactory, bolt the coupling together.