Indmar Premium 400, Operator'S Manual, Page: 70 / 124

7-14
SECTION SEVEN
7. Increase engine RPM to 1200 RPM maximum and let it run to
thoroughly flush the raw water portion of the cooling system
(10-15 minutes).
8. Return engine RPM to idle.
9. Reduce water supply pressure to 1/4 to 1/2 pressure.
10. Turn engine off.
11. Turn water supply off.
12. Remove water supply hose from sea strainer and replace the
flush protection plug.
13. If the boat is equipped with a shutoff valve (sea cock), place it
in the ON position.
Fresh Water (Closed) Cooling Systems
!
WARNING
Avoid possible skin burns, turn the engine
“OFF” and allow it to cool enough so no heat is
registered on the temperature gauge. Only after
the engine is completely cooled is it safe for you
to remove the coolant reservoir cap to check the
level.
All Indmar engines covered in this manual have a closed fresh
water cooling system. In the fresh water system the cooling water
contains anti-freeze and re-circulates throughout the engine. Raw
water is pulled through the intake and flows through chambers
in the heat exchanger and then discharged overboard with the
engine exhaust.