Silent Choice Exhaust System - Mercury MerCruiser MCM 454 Mag MPI Service Manual

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SERVICE MANUAL NUMBER 23

The below swim platform exhaust pipe can be modified for specific height applications by

cutting pipe at location shown.

NOTE: If riser kits are installed, or if more vertical drop is required, cut "a" must be made,

and the upper and lower sections of the pipe rejoined with a 4 in. (102 mm) I.D. exhaust hose

of the required length. Secure with hose clamps.

NOTE: Prime and paint any raw (cut) aluminum surface.

IMPORTANT: Each exhaust bellows must be double clamped at each connection, The

hose clamps are torqued to 30-40 lb. in. (3-5 N·m).

Silent Choice Exhaust System

If engine is equipped with thru-prop exhaust, a thru-transom kit [4 in. (102 mm)], two exhaust

bellows, and eight bellows hose clamps are required.

If engine is equipped with thru-transom exhaust, an exhaust pipe kit (P/N 44266A6) is

required, containing the exhaust pipe and necessary parts.

IMPORTANT: When installing Silent Choice exhaust, it is recommended that the

exhaust bellows on the transom assembly be removed. This is necessary to avoid

creating a vacuum at the exhaust outlet in the propeller at higher boat speeds. This

vacuum could degrade propeller performance on some boats.

It is the responsibility of the boat manufacturer or installing dealer to properly

locate the engine and install exhaust system. Improper installation may allow water

to enter the exhaust manifolds and combustion chambers, and severely damage

the engine. Damage caused by water in the engine will not be covered by

MerCruiser Warranty, unless this damage is the result of defective part(s).

90-861326--1 MARCH 1999

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Cut Line (See Notes)

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