Testing Exhaust Manifolds

[krisnowicki]

I am putting it all back together and I have new exhaust manis and Risers but one bolt on one side isn't "stripped" but it wiggles i can't tighten it any more but it will move to and fro. I was wondering if there is a way to test the manifold riser seal for leaks before I put it together and dump water in to the new engine. The other 3 bolts are SUPER TIGHT. This is on a 305 with center manis and 4 inch risers with four long bolts holding them down

 

[dcg9381]

Re: Testing Exhaust Manifolds

Dunno if you can pressure test it, but there are lots of options for fixing stripped threads.

 

[Chris1956]

Re: Testing Exhaust Manifolds

Kris, You will likely hear a leak in the manifold to head connection. Also, your motor will starve for oxygen in that closed engine compartment.

 

[FreeBeeTony]

Re: Testing Exhaust Manifolds

I think he is referring to the bolts on the manifold/riser, not the manifold/head.

If you can't retap the threads..............maybe you can use a shorter bolt or add some washers............depending on how many threads you are catching.

Just a thought............

 

[krisnowicki]

Re: Testing Exhaust Manifolds

is there any way to pressure test the seal...

 

[Chris1956]

Re: Testing Exhaust Manifolds

Since the mannys are new, can you return it as defective? If not, how about substituting a stud and nut for the bolt that is loose? Or retap to larger bolt size. That connection is very likely to leak, with a loose bolt. Use genuine MerCruiser gaskets (the expensive silver ones). They go on dry.

 

[Bondo]

Re: Testing Exhaust Manifolds

Ayuh,...... Helicoil comes to mind,...........