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Maintenance: Rawwater system
Checking/Changing rawwater
pump impeller
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 rawwater 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 rubber).
5. Push the impeller into position while rotating it in
the normal operating direction.
6. Fit the cover with a new gasket.
7. Close the drain cocks.
8. Open the rawwater cocks.
Cleaning the heat exchanger
Clean if there are signs of clogging, a gradual increase
in engine temperature or high rawwater pressure.
Check/clean the rawwater filter first. Also check for
other damages on the heat exchanger.
1. Drain the external cooling water as described in
the chapter draining the rawwater 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 rawwater cocks. Fill the freshwater sys-
tem.
8. Start the engine and make sure the rawwater sys-
tem is not leaking.
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Summary of Contents for D49A MS
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