INSTALLATION MANUAL
Page 30 of 77 90-864198020
CLEAR HOSE METHOD
1. Obtain a 5/16 - 3/8 in. (8-10 mm) I.D. hose approximately 15 ft (4.5 m) long. Put a metal
fitting or a weight on one end of the hose to keep that end of the hose below the water
line.
2. Put the weighted end of the hose over the port or starboard side of the boat, keeping
it in line with the engine’s exhaust elbow.
3. Route the remainder of the hose toward the engine’s exhaust manifold and elbow.
Ensure that this open end section of the hose is as vertical as possible from the boat’s
bilge to the top of the exhaust elbow
4. Coil excess hose in bilge of boat, keeping it below the water line.
5. Lower open end of hose and siphon water until it starts to come out of the hose. Put a
finger over the hose and lift open end until it is at the top of the exhaust elbow.
6. Slowly take finger off end of hose to let the water level stabilize. The water will seek the
level of the water outside the boat. Keep hose close to exhaust elbow and as vertical
as possible.
7. The measurement between water in hose and top of exhaust elbow is the exhaust elbow
height. Ensure that boat is level.
72700
b
c
d
a
e
a
76859
a-Waterline
b-Top Of Exhaust Elbow
c-Clear Plastic Hose
d-Weight
e-Measurement - Waterline To Top Of Exhaust Elbow
Minimum Exhaust Outlet Hose Size
Model Single Outlet Dual Outlet
Inboard
350 MAG MPI /
350 MAG MPI Horizon
MX 6.2L MPI /
MX 6.2 MPI Horizon
4 in. (102 mm) 3 in. (76 mm)
Tow Sports
350 MAG MPI 3 1/2 (88.9 mm) Not Applicable
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