Exhaust/coolant leak

[Roadart]

Do all exhaust manifold bolts need thread sealant on them? I did rear only and have coolant leaking. Service manual indicates all bolts need sealant. What is the best sealant,? I used Permatex ultra copper(on rear bolt only).

 

[toolmanmike]

I use teflon thread sealant. It works but may not be high temp enough. It's a good idea to put some sealer on all the exhaust bolts/studs. I think only the 4 outside ones go into water though.

 

[Roadart]

I use teflon thread sealant. It works but may not be high temp enough. It's a good idea to put some sealer on all the exhaust bolts/studs. I think only the 4 outside ones go into water though.

Ok guess I will redo all bolts . Thanks for quick response.

 

[toolmanmike]

Ok guess I will redo all bolts . Thanks for quick response.

You bet. I would have to look up the ultra copper but it should work ok.

 

[RustyRatRod]

Exhaust bolts on what? A 1935 Packard 1207?

 

[toolmanmike]

Exhaust bolts on what? A 1935 Packard 1207?

He wishes! LOL Correct me if I'm wrong. 4 corner studs on the small blocks and all the big block bolts need sealer.

 

[RustyRatRod]

He wishes! LOL Correct me if I'm wrong. 4 corner studs on the small blocks and all the big block bolts need sealer.

Yeah I guess? If that's what we're givin advice about? How we be supposed to be knowin? lol

 

[toolmanmike]

Yeah I guess? If that's what we're givin advice about? How we be supposed to be knowin? lol

I have a crystal ball.

 

[Donnie514]

Front and rear bolts on each side go into the water jackets. A total of four. These four are to be studs, not bolts.
The sealer needs to be hi-temp. I used red silicone for 50 years. Now they sell hi-temp Permatex thread sealer.
Do it correct cause it gets messy redoing them things.

 

[Deleted Member]

ARP thread sealer , made just for this purpose

 

[diymirage]

I have a crystal ball.

ive been told mine are brass

 

[oldmodlover]

I have a crystal ball.

Me too.
Need to be handled gently.

 

[Roadart]

sorry guys,i always forget the important stuff. It is a 72 318 in a dart w/headers. It is in the draining process now. Thanks to all Joe

 

[yellow rose]

sorry guys,i always forget the important stuff. It is a 72 318 in a dart w/headers. It is in the draining process now. Thanks to all Joe

Only the front and rear bolt on each side has water behind them. The rest are blind and don't need anything.