INSTALLATION MANUAL
Page 26 of 77 90-864198020
Exhaust System
CAUTION
It is the responsibility of the boat manufacturer or installing dealer to properly lo-
cate the engine and install the exhaust system. Improper installation may allow wa-
ter to enter the exhaust manifolds and combustion chambers and severely damage
the engine. Damaged caused by the water in the engine will not be covered by Mer-
cury MerCruiser Warranty, unless this damage is the result of defective parts.
MEASURING PROCEDURE
1. Fill all fuel, water, gray water and heater tanks to maximum capacity.
NOTE: Weight can be added in these locations to simulate full loaded condition.
2. Add maximum allowable cargo weight to boat in areas where it will be stowed, including
refrigerator and lockers.
3. Add 190 lb (86 kg) of weight in all locations where each passenger will sit during normal
operation.
4. Measure exhaust elbow height. Refer to Measurement Methods. Also, measure
exhaust system slope on applications with through the hull or through the transom
exhaust.
77981
a
b
Using A Universal Protractor (Inclinometer) To Measure Slope
a-Protractor
b-Exhaust Hose Or Tube
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