Volvo Penta D25A MS, Operator'S Manual

Page: 63 / 87

63
Seawater pump impeller check/
hange
IMPORTANT! Always keep a spare impeller and
gasket in store.
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 gasket.
7. Open the seawater cocks.
Heat exchanger cleaning
Clean if there are signs of clogging, a gradual increa-
se in engine temperature or high seawater pressure.
Check/clean the seawater filter first. Check also the
seawater pump impeller.
1. Drain the external cooling water as described in
the chapter draining the seawater system.
2. Detach the pipe connections from the heat ex-
changer.
3. Remove both covers from the heat exchanger
4. Clean the heat exchanger insert pipe using suita-
ble brushes while flushing through the pipe with
water
5. Refit the heat exchanger element and mound the
covers.
6. Connect the pipe connections to the heat exchan-
ger. Check gaskets and change if necessary.
7. Open the seawater cocks. Fill the freshwater sys-
tem.
8. Start the engine and make sure the seawater sys-
tem is not leaking.
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