SECTION - 3 EXHAUST SYSTEM
90-899883183 DECEMBER 2007 Page 11 / 12
Clear Hose Measurement Method From Seacock or Muffler Drain
IMPORTANT: Measure the exhaust elbow height to the waterline inside of the water lift muffler
(instead of the water line outside of the boat) if equipped.
IMPORTANT: The engine must have been operated previously to fill the muffler with water.
IMPORTANT: On engines equipped with more than one exhaust elbow, perform the exhaust elbow
waterline height measurement on the side that sits lower in the water.
1. Attach a clear hose to the muffler drain point or seacock drain point.
2. Start the engine to fill the muffler and the hose.
3. If attached to the seacock drain, open the seacock.
4. Route the remainder of the hose toward the engine's exhaust manifold and elbow. Hold the
open end of the hose vertically from the boat's bilge to the top of the exhaust elbow.
5. Coil excess hose in the bilge of the boat, keeping it below the water line.
6. Lower the open end of the hose to siphon water, When water starts to come out of the hose,
plug the open end of the hose with a finger and lift it to the top of the exhaust elbow.
7. Slowly take the finger off of the end of the hose to let the water level stabilize. The water will
seek the level of the water outside the boat. Keep the hose close to the exhaust elbow and
as vertical as possible.
8. The measurement between the water in the hose and the top of the exhaust elbow manifold
is the exhaust elbow height.
Typical vertical water lift muffler
a - Clear hose for measuring waterline
b - Minimum exhaust elbow height with maximum load
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