Westerbeke 50 Manual de usuario descargar pdf (Pagina 2)

The raw-water filter or strainer is clogged with sediment, sand, goo, grass, or living critters such

as jellyfish and algae. Open and clean it out.

If there is Diminished Flow, consider these likely causes in the raw-water circuit:

Damaged or missing impeller vanes in the raw-water pump and downstream. If the impeller is

completely destroyed, there will be no flow. The impeller should be replaced every year or two, as

the vanes become brittle with age and may snap off, wear unevenly or take on a permanent set,

degrading the impeller’s function. Immediately downstream,

clean out the discharge fitting (elbow) on the raw-water pump. You can’t see anything from either

end of the elbow, but take the elbow off the pump and 'rod' it with a stiff piece of wire. You may find

rubber ends of a failed impeller jammed in the elbow.

To backflush the raw-water circuit:

1. Disconnect the raw water pump outlet at the pump (marked S/W pump outlet in the photo).

2. Disconnect the anti-siphon inlet (the raw water connection into the exhaust elbow at the elbow);

this means you're back flushing through the oil cooler because the oil cooler inlet hose is about 2

inches and would be tough to remove.

3. Get a bucket and a hose with a jet nozzle.

4. Press the jet firmly into the anti-siphon hose and watch for impeller bits to flow out.

5. Change directions for a few seconds when you stop getting bits to shake things loose. Every

now and again blow on the hose until the circuit is dry so you can gauge the resistance.

6. Repeat 4 and 5 until you get three consecutive clean buckets and you can blow freely.

Rebuild the Raw-Water Pump. Replace all items that could affect the pump’s capacity: (especially)

the impeller, cam, cover plate, and back wear plate. Even though the ones that are in the pump look

'OK', it seems that replacing all those items improves seawater flow. The impeller is normally

replaced at least every two years. Keep a spare in light (olive) oil.

Clean the Heat Exchanger(s). The heat exchanger(s) (1. fresh or raw water and 2. oil) may be dirty

or clogged up with sediment and other deposits. The fresh water/raw water heat exchanger is a

large metal can with numerous small diameter tubes inside. Its function is to transfer the engine heat

from the 50:50 coolant to a portion of the raw water which is then dumped overboard by rejoining the

rest of the raw water through the exhaust elbow. Sometimes removing the end cap of a heat

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Westerbeke 50 Manual de usuario Pagina 2