Checking/Changing impeller
WARNING! Risk for water penetration.
Remove the cover from the seawater pump and re-
move the impeller (1).
If there are cracks or other defects the impeller must
be replaced. (If the pump shaft can be turned by
hand the flange must be replaced). Lubricate the
pump housing and the inside of the cover with a little
glycerin.
IMPORTANT! The impeller will be damaged if
other types of lubricant than glycerin are used.
WARNING! If the impeller is damaged, the
pump will not work, which can lead to engine
damage or fire.
Reinstall the impeller using a rotating movement. In-
stall the seal washers on the shaft
center. Install the cover together with a new o-ring.
Seawater system
The seawater system is the boat’s external cooling system. On engines with drives, the seawater pump draws
in water via the drive-unit, through the control system oil cooler to the seawater pump, after which the water
passes the seawater filter before being pumped through the fuel cooler, intercooler, engine oil cooler and heat
exchanger. Finally, the water is pumped into the exhaust pipe elbow, where it is mixed with the exhaust gases.
WARNING! There is a risk that water will enter while working on the seawater system (if the boat is in the
water). Water may flow into the boat if a hose, plug or similar object located below the waterline is removed.
So always close the seawater cock(s) on the driv-unit. If the boat does not have a seawater cock, the flow
of water must be stopped in a safe manner. The boat must be brought up on land if this is not possible.
A. Open
B. Closed
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