Before Each Use; Check The Raw Water Impeller/Sea Pump - ILMOR 2011 MV8 User Manual

B E F O R E E A C H U S E
B E F O R E E A C H U S E
Because this process should be completed while the engine is cool (in order to avoid burns), it is
recommended that this check be completed prior to starting the engine. If checking during an outing,
allow the engine to cool. Be very careful to avoid burns from contact with hot engine parts.
• Ensure the engine is OFF and the engine safety starting switch is discon-
nected. Leave the throttle/shift control lever in neutral. Open the engine
compartment and locate the raw water impeller housing. (This is also some-
times referred to as a sea pump.)
• Disconnect the intake and outflow hoses on the raw water impeller hous-
ing. Remove any debris found inside the hoses and then reconnect.
• 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. T herefore, replacing the gasket is a better
idea than taking any chances with an older one. Also, leaving any portion of
the older gasket on the house or cover can impede good contact.
Ignoring elevated temperatures on a temperature gauge or any other evidence of the en-
gine operating at temperatures above recommended levels can result in serious damage
to the engine. Any resulting damage will not be covered by the warranty.
• Inspect the inside of the impeller housing. If any rubber extrusions on the
end of the arm appear frayed or worn, it should be replaced. Debris enter-
ing the impeller inevitably will damage it. However, the impeller serves its
purpose in deflecting debris and keeping it out of much more expensive
internal engine parts.
• Any uncertainty about the condition of the impeller means that it should
be removed and inspected. The impeller fits very snugly and will require
some care in removing and re-installing or installing a new one. This en-
sures proper operation. T he use of soap or water-based petroleum jelly will
help with installation. Note that proper placement on the gear results in a
squeeze on the arms. This is the correct installation.
• Place a gasket between the housing and the cover after ensuring that the
surfaces are smooth and clean. Re-install the screws loosened when the face
plate was removed earlier. Do not over-tighten the brass screws as it will
cause them to break.
2011 ILMOR MV8 Owner's Manual • Page 14
Check the Raw Water
Impeller/Sea Pump