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Old 21-02-2013, 13:56   #1
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Yet Another Engine Question

Firstly, thank you for the advise received on engine alignment, particularly to After Hours NLCT for the link he provided.
Attached are a couple of pictures which I hope are self explanatory. The engine is a Perkins 30hp Perama. The old (blue) raw water pipe from the heat exchanger to the exhaust pipe was made from thin copper and had a bad kink in it so I decided to bend and weld a new one out of a some heavy wall stainless pipe that I had in my workshop. I always like to make things as simple and straightforward as I can so I eliminated the extra forward facing curves in the blue pipe. Now I'm fretting about it. I absolutely cannot see the point of those extra curves, but surely no-one would put themselves to the trouble if they were not necessary? I don't know much about engines, so will my new pipe be O.K, or can anyone enlighten me as to the shape of the old pipe?
Chris
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Old 26-02-2013, 20:30   #2
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Re: Yet another engine question

The fact that you eliminated the forward facing bend is of no consequence but the use of stainless steel tube could be. Some stainless steels do not not like to have static sea water in them when the engine is not being used, this can cause crevice corrosion cracking in the SS and eventual failure of the tube.

The better option is the SS braided rubber pipe made for this purpose where the water only comes into contact with the rubber.

Cheers Acushla
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Old 26-02-2013, 20:36   #3
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Re: Yet another engine question

Thank you - that is a very valid point, especially as I made it out of scrap that I have lying about and consequently have no idea as to its grade.
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Old 26-02-2013, 20:52   #4
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Re: Yet another engine question

Valid point about stainless but the water should drain out, it is higher. Could there be any movement between the different parts, if so something with more flex? Or, keep an eye on it but how vigilant are you? The recommended piece of hose sounds best.
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Old 27-02-2013, 07:15   #5
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Re: Yet another engine question

+100 On the drawing! Best illustration yet, instead of ....

"My whizbang goes clunk on a port tack.... Can you help?"

Others are spot on with recommendation.... Go hose my friend....
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Old 27-02-2013, 14:05   #6
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Re: Yet another engine question

The stainless pipe connects to the heat exchanger via a rubber boot type thing and to the exhaust pipe by a few inches of rubber hose, so it is isolated from the engine, so vibration and electrolysis(?) shouldn't be an issue. We are going off on a cruise for a few weeks so will leave it as it is, but I do believe that after that I change it to the recommended braided hose.
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