© 5/2013 Ilmor Marine, LLC, Version 1.0 7-9
MAINTENANCE
NOTICE: This is a critical function of routine maintenance. Even clean-
appearing waterways may have debris such as pine needles or moss
that can enter the cooling system and create a blockage against the
screen. Failure to perform this function can result in serious overheating
of the transmission. Damage to the engine and/or transmission caused
by overheating is not covered by warranty. Always pay attention to your
temperature gauge, even if you are carefully performing this check.
Failures of the raw water impeller or blockage of the transmission cooler
are frequent causes of overheating. Water in the transmission oil as a
result of cooler failure may also void the warranty.
REPLACE THE RAW WATER IMPELLER/SEA
PUMP IMPELLER
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.
1. Ensure the engine is OFF and the engine safety starting switch is
disconnected. Leave the throttle/shi control lever in neutral. Open the
engine compartment and locate the raw water impeller housing. (is
is also sometimes referred to as a sea pump.)
2. Disconnect the intake and outow hoses on the raw water impeller
housing. Remove any debris found inside the hoses and then
reconnect.
3. Remove the serpentine belt.
4. Remove the two bolts which hold the sea pump onto the engine and
remove the sea pump.
5. On open cooled engines remove the screws on the impeller cover and
very carefully break the gasket seal. On closed cool engines remove the
screws from the front of the impeller housing and carefully separate the
impeller housing from the bearing carrier.
NOTICE: Always pay attention to any gauges or warning lights. Ignoring
elevated temperatures on a temperature gauge or any other evidence of
the engine operating at temperatures above recommended levels can
result in serious damage to the engine. Any resulting damage will not be
covered by the warranty.
6. 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. If
there is not a slight bend to the paddle-wheel arms, replace it. Debris
entering the impeller inevitably will damage it. However, the impeller
serves its purpose in deecting debris and keeping it out of much more
expensive internal engine parts.
Open Cooled
Closed Cooled and 7.4L
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