Exhaust Manifold Riser Leak

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   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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hayajustin Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: May-11-2018 Location: Indiana Status: Offline Points: 43	Post Options Post Reply Quote hayajustin Report Post Thanks(0) Quote Reply Topic: Exhaust Manifold Riser Leak 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?

phatsat67 Members Profile Send Private Message Find Members Posts Add to Buddy List Grand Poobah Joined: March-13-2006 Location: Indiana Status: Offline Points: 6157	Post Options Post Reply Quote phatsat67 Report Post Thanks(0) Quote Reply 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.

TRBenj Members Profile Send Private Message Find Members Posts Add to Buddy List Grand Poobah Joined: June-29-2005 Location: NWCT Status: Offline Points: 21198	Post Options Post Reply Quote TRBenj Report Post Thanks(0) Quote Reply 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.

hayajustin Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: May-11-2018 Location: Indiana Status: Offline Points: 43	Post Options Post Reply Quote hayajustin Report Post Thanks(0) Quote Reply 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.

hayajustin Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: May-11-2018 Location: Indiana Status: Offline Points: 43	Post Options Post Reply Quote hayajustin Report Post Thanks(0) Quote Reply 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.

Exhaust Manifold Riser Leak

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