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Exhaust Manifolds
I noticed some seepage coming from my risers, so I replaced the gasket today. I also noticed corrosion on the exhaust manifolds. It's a 502 and put 400 hours on it now. How much longer do I have before I should replace the exhaust manifolds?https://cimg9.ibsrv.net/gimg/www.off...ddd7764c51.jpg
Close up,lower exhaust https://cimg0.ibsrv.net/gimg/www.off...c52d6f343b.jpg , rust is getting soft. |
The longer you wait, the more you risk destroying an engine.
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I noticed some seepage coming from my risers, so I replaced the gasket today. The rust ya do show, is irrelevant,.... |
Originally Posted by Bondo
(Post 4619191)
Ayuh,.... The failure point is that gasket matin' surface, that you didn't post a picture of,......
The rust ya do show, is irrelevant,.... |
Ayuh,..... That's Better, but not good enough,..... The gasket is still there, blockin' the view of the top of the manifold,......
What yer lookin' for is the Width of the iron wall 'tween the water passage, 'n the exhaust passage,.... Pull the gasket off, 'n clean the top of the manifold with a big ole flat file, to clean fresh cast iron,.... The flat file helps ya keep the finish surface Flat,.... Once that is done, the iron wall I mentioned needs to be a minimum of 3/16" wide to support the gasket,.... If thinner, failure is just 'round the corner,..... |
Originally Posted by Bondo
(Post 4619242)
Ayuh,..... That's Better, but not good enough,..... The gasket is still there, blockin' the view of the top of the manifold,......
What yer lookin' for is the Width of the iron wall 'tween the water passage, 'n the exhaust passage,.... Pull the gasket off, 'n clean the top of the manifold with a big ole flat file, to clean fresh cast iron,.... The flat file helps ya keep the finish surface Flat,.... Once that is done, the iron wall I mentioned needs to be a minimum of 3/16" wide to support the gasket,.... If thinner, failure is just 'round the corner,..... |
Ayuh,...... Any time,..... ;)
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run in salt water or fresh water?
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Originally Posted by badbug
(Post 4619498)
run in salt water or fresh water?
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Check with SHUNTER here on OSO (Houston, TX), I know he just removed a set of stock manifolds from his 502 for aftermarkets. His are in pristine shape. I don't know if he is wanting to part with them, just a suggestion. Good luck
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I dont have a big block, but my small block manifolds looked just like those. My problem was the risers. They got little holes st the top and leaked water into my engine. I had to replace the risers and manifolds. It milkshaked the motor too. changed the oil like six times and now all is well... Make sure you check those risers really well. I replaced mine with SS ones. They will never rust again. |
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