I pulled the manifold off to have it hot tanked and repainted. Part of an ongoing war on corrosion.
When I got the manifold back from the machine shop. It looked great... nice clean passages primed ready to paint. A couple of problems I see however...
The threads on the aft cooling water fitting have deteriorated badly (the deteriorated threads werent visible with the build up of gunk). One of the previous owners must have used a fitting of the wrong material which caused the manifold to corrode away in that area. There are probably 2 to 3 good threads left but I cant get the fitting to seal with regular teflon pipe dope.
The bottom of the raw water passage inside the manifold still has a thick layer of hard gunk build up. When I remove the drain plug at the aft end of the manifold the hole is blocked. I carefully scraped out a bit of the gunk figuring I would break through into the water passage but never could reach the water passage.
1. Was the cooling water fitting a tapered pipe thread? What size?
2. What should I use to seal the threads as I reinstall the new brass fitting in the deteriorated hole? (Cold Weld ?)
3. When you hot tank the manifold is it typical for a layer of hardened gunk to remain in the bottom of the water passage or should it come back completely gunk free?
4. When I reinstall the manifold on the block do you install the gasket dry or does it need to have some sealer on it? If so what type is recommended?
Thank you for the help
Tug
________
Chrysler Akino
When I got the manifold back from the machine shop. It looked great... nice clean passages primed ready to paint. A couple of problems I see however...
The threads on the aft cooling water fitting have deteriorated badly (the deteriorated threads werent visible with the build up of gunk). One of the previous owners must have used a fitting of the wrong material which caused the manifold to corrode away in that area. There are probably 2 to 3 good threads left but I cant get the fitting to seal with regular teflon pipe dope.
The bottom of the raw water passage inside the manifold still has a thick layer of hard gunk build up. When I remove the drain plug at the aft end of the manifold the hole is blocked. I carefully scraped out a bit of the gunk figuring I would break through into the water passage but never could reach the water passage.
1. Was the cooling water fitting a tapered pipe thread? What size?
2. What should I use to seal the threads as I reinstall the new brass fitting in the deteriorated hole? (Cold Weld ?)
3. When you hot tank the manifold is it typical for a layer of hardened gunk to remain in the bottom of the water passage or should it come back completely gunk free?
4. When I reinstall the manifold on the block do you install the gasket dry or does it need to have some sealer on it? If so what type is recommended?
Thank you for the help
Tug
________
Chrysler Akino
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