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Old 20-03-2014, 15:50   #1
rlg
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flushing fresh water cooling system on W-46 westerbeke

Can anyone tell me how to flush my fresh water cooling? I cant see a drain and pulling hoses is messy and not very effective. I would also like to include the loop to the water heater as well. Seems like it should be a simple thing...

thanks, Rob
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Old 25-03-2014, 12:06   #2
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Re: flushing fresh water cooling system on W-46 westerbeke

It's not easy on this engine. The drain plug for the block is actually behind the starter. You cannot get to it without removing the starter. Crazy, I know. I didn't believe it myself until my mechanic showed me another W46 on the bench and I could look for myself. Pulling the starter does not necessarily have to be a big job, but it will definitly add time to the job. Maine Sail once wrote a post of how he flushes an engine using an external electric pump and some appropriately rigged-up hoses. It involves removing the thermostat as well. If you pull the starter to drain the block, and use his flushing method, you will get the job done and well. But what a pain
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Old 25-03-2014, 15:35   #3
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Re: flushing fresh water cooling system on W-46 westerbeke

Thanks saltyhog, I think I remember hearing that before. Im Going to search his method. Ive just been flushing with distilled water a few times, its getting better but damn headbanger like you say! They dont make it too easy to do the right thing...
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Old 25-03-2014, 15:43   #4
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Re: flushing fresh water cooling system on W-46 westerbeke

For normal maintenance it should be quite sufficient to drain most of the water from the system, and re-fill with fresh coolant. What you are doing is just refreshing the anti-corrosion additive package.

If you've left the coolant in for far too long, and corrosion or sludge have taken hold, then you need to flush.
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Old 25-03-2014, 17:50   #5
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Re: flushing fresh water cooling system on W-46 westerbeke

The W-46 has a V-shaped, stainless steel, directional/bypass reed valve in the water heater hose take-off fitting. Flushing in one direction will collapse the butterfly and not flush the heater, other way will.
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Old 26-03-2014, 17:00   #6
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Re: flushing fresh water cooling system on W-46 westerbeke

thanks for the replies.
I found Maine Sail's post on flushing, guess thats the route Ill take.
My system isnt too bad but I will feel better after a flush.
Thanks for pointing out that valve Blue Stocking, never seen it before.
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