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Old 03-06-2021, 06:22   #31
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Re: Volvo Penta MD7a Water cooling system

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Originally Posted by MicHughV View Post
I had that same engine....those fittings are a royal pain in the arse.....I had the same problem...could not get them to fit right and they leaked...

what I did was to make two cuts in the copper tubing about 4" or so away from that fitting....and with about a 3" gap to the next cut....then I spliced in a rubber hose to each end of the copper pipe...and clamped it on with a hose clamp...

this way I could fit that copper tail and rubber fitting perfectly into the hole where it needed to go...and let the rubber hose give me enuff flex to continue the to the next run of copper tubing....

never had a problem after that...
Thanks for the advice. How did you make the copper ends kept in place without the pressure on both sides of the metal tube ?
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Old 03-06-2021, 06:48   #32
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Re: Volvo Penta MD7a Water cooling system

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The brackets 69 A&B hold it to the water pump and that's all I have. I had problems getting a seal. I pulled the pipe off and bent it a little so it would have some pressure to hold it in place. It's been holding up pretty good . There iwas a little sign of water stain but no visible leak and its a lot better than it was. I think it sealed itself . I painted everything about 100 hrs ago and the staining is pretty much stopped.

FWIW Mine is holding up good. No sign of leaking. It' been 10 months and 2-300 hours
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Old 15-08-2021, 03:53   #33
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Re: Volvo Penta MD7a Water cooling system

Reading the initial post was like a memoir of my recent rebuild. And continuing with my woes was this copper coolant pipe and the fittings.
I will try with more rubber washers of varying sizes before splicing in a flexible end for the pump side as I am getting leaks on all 3 fittings. It seems trying to fit all 3 equally straight is too difficult. It may also be that I have cleaned up the manifold so much that the ports are larger??.

I do have a question though about the thermostat housing: Should it not have a gasket? It's metal on metal. I do have a small rubber o-ring for one of the ports and of course a new gasket for the thermostat but it still leaks like a sieve.
Even a gasket is not originally here, I think I will make one for it.
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Old 15-08-2021, 05:26   #34
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Re: Volvo Penta MD7a Water cooling system

For thermostats yiu can use some permatex.
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Old 15-08-2021, 18:08   #35
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Re: Volvo Penta MD7a Water cooling system

If I remember right there is a ring /gasket around the thermostat and an o-ring on the small port. Thats all. Mine seals fine. I had problems with the tubing but I got it all working good now.
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