Exhaust Angle Measurement
Measure the exhaust angle of each section of the exhaust system using an inclinometer as shown in the diagram below. Begin
the measurement at the exhaust elbow outlet continuing along each section to the exhaust exit point of the boat. All exhaust
angle measurements must be performed with the boat at rest in the water. Perform the first set of measurements without a load
in the boat. Perform the second set of measurements with the boat fully loaded. Refer to Loading Requirements.
Typical exhaust
a - Minimum 152.4 mm (6 in.),
maximum 406.4 mm (16 in.)
b - Inclinometer
c - Exhaust hose or tube
Typical muffler assembly
a - Hose
b - Hose clamps
c - Muffler
d - 88.9 mm (3.5 in.) outlet
Component Replacement
Through‑the‑Propeller Exhaust
IMPORTANT: The exhaust pipe and the gimbal housing mating surface must be clean and free of nicks and scratches, and the
O‑ring must be properly seated in the groove or water may leak into the boat.
1. Inspect and clean the mating surfaces on the gimbal housing.
Exhaust Pipe and Through-the-Propeller Exhaust
Page 7C-8 © 2016 Mercury Marine 90-8M0099748 eng DECEMBER 2015
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