How to test an OMC 2.3L Exhaust manifold

[Keyboardman]

Hi all, before I trash this 2.3 Cobra set up I have I'd like to at least test the manifolds. I have the exhaust and riser off. The outside looks good visually and the insides are rusted up quite a bit. I've heard about using Acetone. Can I fill up the exhaust ports to see if it leaks? What's the best way to test it? Thanks

 

[Scott Danforth]

take manifold off boat. block off hose feeding water to manifold. fill manifold water jacket with acetone and let sit for a few hours. there should be no change in fluid height.

any cracks will be evident by the acetone fluid level lowering.

 

[Scott Danforth]

also a visual test. if the gasket surface where the manifold meets the riser is rusty, anywhere where the metal is thinner than 3/16" it needs to be replaced. if its thicker, clean up gasket mating surfaces with a large flat file