Before Each Use
(if the engine has shown evidence of overheating during the previous outing. If overheat-
ing occurs during an outing, checking the impeller is imperative!)
Check the impeller
Because this process should be completed while the en-
gine is cool and cannot cause burns to your skin, we recom-
mend you do this before starting your boat. If checking
during an outing, allow the engine to cool some before check-
ing and be very careful to avoid burns from contact with hot
engine parts.
Step 1: Ensure the engine is OFF and the engine safety
starting switch disconnected. Be certain that the throttle/
shift control lever is in neutral. Open the engine com-
partment and locate the raw water impeller housing.
Step 2: Disconnect the intake and outflow hoses on the
raw water impeller housing to check for debris. Reconnect.
Step 3: Remove the screws on the impeller cover and very
carefully break the gasket seal. Because a good seal is very important to avoid potentially
serious leaks while the engine is in operation, it is advisable to have some new gaskets in
the boat’s glovebox for such occasions. If even a slight gap exists, you may experience
problems in the future, so replacing the gasket is a better idea than taking any chances
with an old one. Also, leaving any portion of the old gasket on the housing or cover can
impede good contact.
Step 4: Inspect the inside of the impeller housing. The paddle-wheel should appear as it does in this photograph.
If any rubber extrusions on the end of the arm appear frayed or worn, it should be replaced. If there is not a slight
bend to the paddle-wheel arms, replace it. Debris entering the impeller inevitably will damage it; but it serves its
purpose in keeping debris out of much more expensive internal engine parts.
Step 5: If you are uncertain about the condition of the
impeller, remove it and inspect. When installing or re-install-
ing one, you will find it is a tight fit. This ensures proper
operation. The use of soap or Vaseline will help with installa-
tion. You will note that proper placement on the gear results
in a squeeze on the arms. This is the correct installation.
Step 6: Place a gasket between the housing and the cover
after ensuring that the surfaces are smooth and clean; then
re-install the screws in place. Do not over-tighten the brass
screws. This can cause them to break.
BEFORE EACH USE
17-5
Ignoring elevated temperatures on a tempera-
ture gauge or any other evidence of the en-
gine operating at temperatures above recom-
mended levels can result in serious damage to the engine. Any result-
ing damage will not be covered by, and may void, your warranty!
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