Depco do a great job. You might give them a shot at rebuilding both pumps. Also make sure none of the sewater intake hoses are soft- if they delaminate, they can obstruct the flow of water under suction from the pump, they will actually close up a bit.
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Thread: Acid flush raw water system.....
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Re: Acid flush raw water system.....
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09-22-2020 09:05 PM #12
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09-22-2020 09:33 PM #13
Re: Acid flush raw water system.....
And here are the afters..... Although it appears to have improved I am not having a "wow" moment.
1978 53' Motor Yacht "LADY KAY V"
Hull number 524
Chesapeake Bay
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Re: Acid flush raw water system.....
I would change the thermostats and seals. One theromstat that sticks just slightly short of fully open can cause the same issue.
Sky Cheney
1985 53EDMY, Hull #CN759, "Rebecca"
ELYC on White Lake--Montague, MI
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09-22-2020 10:07 PM #16
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09-22-2020 10:26 PM #17
Re: Acid flush raw water system.....
New thermostats in stock. And I agree with that assessment. It was the next thing on the list. Which brings me to the following......
The manual I have is (also) for trucks. They have radiators and things look slightly different. The main characteristic of the thermostat housing is the square with four bolts. I am 99% the first pic is it on top of the fresh water pump with the electrical temperature probe in it's body. (Not visible in the pic) I assume the sender on top is the alarm.
So that begs the question: What is the second pic? Square housing, 4 bolts, connected to the fresh water reservoir and the transmission oil cooler in the bottom of the reservoir/heat exchanger. It also has the mechanical temp probe in it. (Visible in the picture) Out of the bottom comes a tube to the exhaust manifold.....1978 53' Motor Yacht "LADY KAY V"
Hull number 524
Chesapeake Bay
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Re: Acid flush raw water system.....
You have thermostats on each bank. I have four per my 12/71. You can test the thermostats. But I think you’ve got to get those pipes clean. Mix is 17 quarts water to 3 quarts acid for 5 gallons total. Probably 90 mins and a good rinse.
Semper Siesta
Robert Clarkson
ASLAN, 1983 55C #343
Charleston, SC
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Re: Acid flush raw water system.....
I would suggest a slide hammer seal puller to replace the seals and new bolts when you reinstall the housings.
Sky Cheney
1985 53EDMY, Hull #CN759, "Rebecca"
ELYC on White Lake--Montague, MI
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09-22-2020 11:03 PM #20
Re: Acid flush raw water system.....
Last edited by oscarvan; 09-22-2020 at 11:18 PM.
1978 53' Motor Yacht "LADY KAY V"
Hull number 524
Chesapeake Bay