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Maintenance: Raw water system
Raw water pump impeller check/
change
IMPORTANT! Always keep a spare impeller and
gasket in store aboard the ship.
1. Drain the external cooling water as described in
the chapter draining the seawater system.
2. Remove the pump end cover and the impeller.
3. Inspect the impeller. Change the impeller if there
are any visible cracks or other defects.
4. Clean the inside of the housing. Lubricate the
pump housing and the inside of the cover with
water-resistant grease (non-aggressive on rub-
ber).
5. Push the impeller into position while rotating it in
the normal operating direction.
6. Fit the cover with a new sealing ring.
7. Open the seawater cocks.
Seawater filter check/clean
If the vessel is equipped with a seawater filter refer to
the maintenance description delivered by the supplier
of the filter.
NOTE! If the water wherein the vessel operates is se-
verely polluted, contains large amounts of seaweed,
etc., the filter must be checked more often than is
specified. The filter can otherwise become clogged
and the engine overheated.
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