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TOPIC: Over heating radiator cap leaking

Over heating radiator cap leaking 16 May 2017 01:42 #1

  • rcdriver11
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My 2.1 L volvo overheated first time out within about 10 minutes on the water. I brought it home and saw that water was coming out at the radiator cap when it was hot. I got a new cap and I also changed the water pump impeller which was trashed. Thought that should take care of it. Still after running for a few minutes in a bucket of water the new cap started weeping and wasn't really seeing much water coming out the exhaust. What should be my next step.

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Over heating radiator cap leaking 16 May 2017 01:59 #2

  • Pcpete
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Welcome! Great question. A bucket isn't very much water for your motor and the pump isn't real great at self priming. Get a set of "Earmuffs" that connect to a hose, then try it. You are going to want to recheck that impeller. If it was running dry it may have overheated. Running on the earmuffs should push a fair amount of water through the system. More if there are no impellers to slow it down.

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P/C Pete
Edmonds Yacht Club (Commodore 1993)
1988 3818 "GLAUBEN"
1980 Encounter Sunbridge "Misty Blue" (Sold)
MMSI 367770440
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Boating on the Salish Sea since 1948

Over heating radiator cap leaking 16 May 2017 04:18 #3

  • builderdude
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After testing on the muffs I'd look to replace the t stat next.

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Dave
Edmonds, WA
"THE FIX"
'93 2556 5.7 Bravo II 2.0:1 18 1/4x19 P
.030 over-Vortec top end-part closed cooled
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www.baylinerownersclub.org/index.php/for...ansom-repair-my-2556

Over heating radiator cap leaking 16 May 2017 04:56 #4

  • rcdriver11
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Thanks,
The bucket I used covered the water inlet on the out drive. The T stat was my next thought also.
It does look like I may have fixed the problem. The water inlet pipes were clogged. I ran water backwards and got the water to run free. No more heating up.
I did notice my exhaust hose in the motor compartment has a large tear in it. And the bellows on the outside of the boat is torn also. Can I run the boat with them like that until I get new ones shipped? What if any problems will it cause?

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Over heating radiator cap leaking 16 May 2017 05:34 #5

  • builderdude
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rcdriver11 wrote: I did notice my exhaust hose in the motor compartment has a large tear in it. And the bellows on the outside of the boat is torn also. Can I run the boat with them like that until I get new ones shipped? What if any problems will it cause?

Assuming your referring to the rubber exhaust coupler? They can become cooked due to an overheat, No do not run it with a "torn" exhaust coupler.
If your referring to the u joint bellow the answer is the same. Do not run it with a "torn" bellow, you risk water damage to the parts that the bellow is there to protect and then some. You may already have a problem regarding the u joint bellow, you'll need to remove the drive to inspect.

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Dave
Edmonds, WA
"THE FIX"
'93 2556 5.7 Bravo II 2.0:1 18 1/4x19 P
.030 over-Vortec top end-part closed cooled
***The rebuild of my 2556***
www.baylinerownersclub.org/index.php/for...ansom-repair-my-2556
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