Visit our Popular Forums

Raven · 19-05-2008, 13:32

I'm replacing the exhause elbow and mixer elbow on my Yanmar 3HM35F. Any advice one what (if anything) should be used to seal the threads on the coupler?

Thanks in advance!

imagine2frolic · 19-05-2008, 13:43

I have been doing exhaust for 30 years, from Rolls to end of their life Chevies. You can throw in a Tucker too. I use RTV COPPER SEALANT for anything questionable to fixing something that should be dead..................

hellosailor · 19-05-2008, 16:08

If that's past the water injection point, I'd guess teflon packing or sealant would do, since it is used for steam fittings. There's probably something safer than asbestos to replace that on really hot pipes these days.

The metal-filled RTV should be good...I'd just be reluctant to "glue" the pipes with something that might melt out anyway. I bet a call to LocTite or PermaTex would get you the right answer for the real right part!

Raven · 19-05-2008, 18:04

I was hoping to use something of the "soft set" variety, like one of the Gasoila products, allowing dissassembly if needed. I'm not sure, however, what will work best in the marine environment.

Oceansandmts · 19-05-2008, 18:25

Must be springtime up here!
If taking it apart again is important, nickel Neverseize from McMaster Carr is good for 2600 F and will have other uses around the boat. It's not a sealant, but I have used it on pipe threads on exhaust risers with success. Their item # 1028K63

Fair Winds

Chief Engineer · 19-05-2008, 21:21

Neverseize or Gasoila works just fine.

Nauticatarcher · 19-05-2008, 22:27

High Temperature, copper RTV gets my vote used it to get exhaust gasket to seal on my Gardner 8L3B engine, great stuff , I always carry that and knead-it epoxy , between the two of them you can darn near fix anything