Pressure testing a exhaust manifold???

[f_inscreenname]

After getting my motor put together yesterday I found one of my exhaust manifold was dripping water where it mated to the motor block. Pulled it off and found water in the last (#7) exhaust port. I took the manifold apart and can not find where is was leaking. I put them all back together with new sealant and a home made end cap and let sit overnight. The question is how many PSI should I use to test them? The reason I am even bothering to test them is they are not that old (5 years) and the bay is brackish water (I try to flush after each use) . When you look inside they don't look that bad (I've seen bad ones) and I think it may be the gasket or the exhaust elbow that is older then the manifold.<br /><br />What is half of a admiral? #500 I need to get a different hobby , boats, message boards about boats.

 

[yoced]

Re: Pressure testing a exhaust manifold???

20 psi is all you need to find any leak if you are pressurizing with air. Keep in mind that if your home-made end cap is not holding the 20psi you will get leaks that look like they are coming from inside the manifold.<br /><br />If you are getting water from a riser gasket leak you can almost always tell from the rust marks which will be found on the milled surface of the manifold under the gasket (or on the surface of your riser/elbow above the gasket). A gasket that is not leaking will have no rust under it.

 

[f_inscreenname]

Re: Pressure testing a exhaust manifold???

Thanks