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-   -   Stripped exhaust drain plug threads (http://www.mastercraft.com/teamtalk/showthread.php?t=54102)

blakekrone 05-05-2013 11:18 PM

Stripped exhaust drain plug threads
 
So the boat I bought in CA probably never had its drain plugs removed and I had to remove them last fall to dry block the engine before having it hauled back to MN. I went to put back in the plugs today and 1 side went in without any trouble, the other side however doesn't seem like it wants to bite at all. The plugs themselves look a little rough around the edges so I picked up a new 3/4" NPT plug and that won't even bite either. It looks like the manifold was so rusted out that the threads have deteriorated to nothing for the first few turns. Is it worth it trying to rethread with a tap or do I just need to get a new manifold?

JimN 05-05-2013 11:56 PM

Quote:

Originally Posted by blakekrone (Post 932501)
So the boat I bought in CA probably never had its drain plugs removed and I had to remove them last fall to dry block the engine before having it hauled back to MN. I went to put back in the plugs today and 1 side went in without any trouble, the other side however doesn't seem like it wants to bite at all. The plugs themselves look a little rough around the edges so I picked up a new 3/4" NPT plug and that won't even bite either. It looks like the manifold was so rusted out that the threads have deteriorated to nothing for the first few turns. Is it worth it trying to rethread with a tap or do I just need to get a new manifold?

Look for a 3/4" tapered plug or fitting. If that won't grab, go one size up, maybe metric. If it won't grab a new plug, re-tapping won't work because the tap is the same size. You could also install a brass barb fitting on both manifolds (use JB Weld on the stripped one), so you can use the hose & coupler they added to the boats in about '98. It makes draining a lot easier and the fittings in the manifolds don't have to come out.

XtwentyNot 05-06-2013 12:25 AM

2 Attachment(s)
Attachment 94544
Attachment 94545

And a tap from a local parts store is how I fixed mine five years ago.

Skipper 05-06-2013 07:30 AM

You might also be able to clean out the threads on the manifold with a wire cone attachment on your drill.

JimN 05-06-2013 07:47 AM

Quote:

Originally Posted by Skipper (Post 932540)
You might also be able to clean out the threads on the manifold with a wire cone attachment on your drill.

I used to see this, so I bought a 3/4" tap. If it's rusted too badly, the tap will remove rust and leaves the hole too large because removing rust removes metal, too.

mikeg205 05-06-2013 09:33 AM

Keep them holes oiled up to keep the threads in good shape... the rust creeps outside in and inside out.. a little maintenance goes a long way..

blakekrone 05-06-2013 10:12 AM

Quote:

Originally Posted by mikeg205 (Post 932562)
Keep them holes oiled up to keep the threads in good shape... the rust creeps outside in and inside out.. a little maintenance goes a long way..

Exactly why I'm debating buying a new manifold. I plan to keep the boat for awhile so it might be worth it instead of having to deal with it each year.

blakekrone 05-06-2013 03:53 PM

Quick update, was a nice day for a drive and I haven't towed the boat yet any distance so I decided to run up to midwest mastercraft. They checked it out real quick with their tap and said that should work so I ran around looking for a 3/4" tap, finally found one and now I'm good to go it appears. Should know tomorrow when I start it up.

Hoping to hit the lake for an hour tomorrow night just cruising.

88 PS190 05-06-2013 04:08 PM

Good result, due to the taper you can usually salvage it, even if you have to thread deeper.

Table Rocker 05-06-2013 04:22 PM

Quote:

Originally Posted by 88 PS190 (Post 932709)
Good result, due to the taper you can usually salvage it, even if you have to thread deeper.

Yep, it will probably even look better with the plug not sticking out so far.


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