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Exhaust Manifold Riser Leak

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hayajustin View Drop Down
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    Posted: May-15-2019 at 10:09am
Hey Everyone,
Last fall when I was winterizing the boat, I noticed one of the bolts that holds the riser to the exhaust manifold had popped off. So, I figured to address this issue in the spring. I started investigating the issue a few weeks ago and found the gasket had deteriorated quite a bit and there was a decent amount of cavitation erosion on the exhaust manifold, not so much the riser. Last night, I cleaned up the surface the best I could and installed a new gasket. A small drip like leak was still present. So, I tore it apart and applied red RTV to the exhaust manifold and followed the procedure for cure time and tightening. I will know the results this evening. Has anyone done anything similar to resolve a small leak?
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phatsat67 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote phatsat67 Quote  Post ReplyReply Direct Link To This Post Posted: May-15-2019 at 10:44am
No, but it should work on the outside seal. Was the inside sealing surface in better shape? Inside sealing is more important to keep water from dripping back down into an open valve.

If you can't make it seal a cheap alternative would be to take the lower manifold to a local machine shop and have them surface it rather than spending 250-300 on a new lower manifold.
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TRBenj View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote TRBenj Quote  Post ReplyReply Direct Link To This Post Posted: May-15-2019 at 10:50am
A few min spent with a file then a block sander to get the mating surfaces flat would be time well spent.
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hayajustin View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote hayajustin Quote  Post ReplyReply Direct Link To This Post Posted: May-15-2019 at 11:02am
The inside sealing surface was in good shape. If I do not get a good seal with the RTV, I will try smoothing out the surface with a file and sanding block.
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hayajustin View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote hayajustin Quote  Post ReplyReply Direct Link To This Post Posted: May-16-2019 at 9:44am
I ran the boat for 30 minutes last night, no leaks so far. I will monitor the joint throughout the summer.
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