250 HP JET DRIVE INSTALLATION MANUAL
Page 34
90-10240040 DECEMBER 2003
Water By-Pass System
The water by-pass system is designed to improve powerhead cooling at idle speed.
1. Locate the water by-pass components (provided).
a
b
c
a-Thru-Hull Fitting
b-Brass Nut
c-Hose Clamp
IMPORTANT: The thru-hull fitting must be correctly positioned in the boat transom
as instructed in Step 3.
2. Select the mounting location for the thru-hull fitting as follows:
A
2 in. (50 mm)
Minimum
Top View of
Transom
A
Back View
of Transom
Water Line
• The thru-hull fitting must be mounted in either side of the transom within the zones
marked A.
• The thru-hull fitting must be located a Minimum of 50 mm (2 in.)
above the water line
when boat is at its maximum load capacity.
• The water by-pass hose must slope down towards the thru-hull fitting at a minimum rate
of 25 mm (1 in.) drop per 300 mm (12 in.) of hose.
• The thru-hull fitting should be positioned so the water spray will be pointed downward.
3. After the location has been selected for the thru-hull fitting, drill a 14.3 (9/16 in.) diameter.
hole.
4. Apply Marine Sealer to entire length of threads and under the head of the thru-hull fitting.
Fasten the fitting into the transom with the brass nut (provided).
c
a
b
a-Thru-Hull Fitting
b-Brass Nut
c-Marine Sealer
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