Exhaust Pipe sealant.

[unabated]

On my passage to St Maarten from Bermuda, the exhaust pipe broke off, just where the 90deg elbow is. The elbow is fine but he threads were broken off the pipe. The pipe (1 1/2 ) screws into a flange on the water cooling system.
I have a new pipe to install.
Question: I was going to use NeverSieze on the threads when I reassembled it. Now I am thinking some other thread sealant. I know NeverSieze is not a sealant. Just regular pipe sealant would work?
opinions?
a

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[RichCarter]

Alan
The water injection elbow is a regular service item. They rust out from the inside. The combination of hot exhaust gas and salt water eats them up. They last about 7 years. If the pipe has gone its only a short time before the injection elbow goes. My advise is to replace the whole assembly. You want to unscrew the pipe where it connects to the exhaust manifold and coolant reservoir. Removal of the fitting can be very difficult. I suggest a large pipe wrench with an extension on the handle. An injection elbow isn’t expensive nor are cast-iron pipes. Injection elbows come in two flavors, an injection elbow and a high-riser. I suggest using the high-riser type. although more expensive, it protects better against water getting into your exhaust manifold.

Use teflon pipe thread sealant just as you would with water pipes.

Hope this helps
Regards Rich

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[unabated]

Rich
I replaced the elbow about two years ago. I should have replaced the pipe at the same time. I have been spraying penitrating oil on there for the last 3 days. Just before I put a large pipe wrench on it, I moved over to the marina. Didnt want to break anything while sitting on an anchor in 25 kt trade winds.
I stood on the pipe wrench prepared for the worst, lo and behold it just unscrewed. easy peasy.
Do you really think teflon tape is going to work on the engine side of that pipe? I can see it on the elbow side where it’s cooler. I have some pipe dope which is good to 450…. I think that may do the trick. I found it after i e-mailed the last note.

— On Tue, 12/8/09, <> wrote:

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[RichCarter]

Alan
Don’t use the tape. You want teflon pipe sealant similar to below. You can use this on fuel lines too.
http://www.ryderfleetproducts.com/cgi-bin/ryderfp/products/srm/oid/46299/erm/product_detail.jsp?utm_source=googlebase&utm_medium=search&utm_campaign=product

Rich

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[quent]

Alan-
Many mechanics use stove pipe sealant, the stuff used on wood stoves. It holds up well against the engine heat, and allows for later dissembly.
Quent

[sumocean]

That is what I used the stove pipe sealant. It was very sticky yet the pipes came right apart three years later. I can’t remember the brand it’s still in the shop down at the boat.

Linus

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