Best Way to Search for Intake & Exhaust Manifold Leaks

[Bill Jewell]

Hello,

 

I have a 1930 Franklin that I need to check for leaks in my Intake manifold and Exhaust manifold.  Since the engine heats up so quickly, what is the best way to search for leaks on these two manifolds?

 

Thanks for your help!

 

Bill

[Larry Schramm]

Might try spraying a little bit of WD-40 around the intake while the engine is running at idle.

 

If you hear the engine change RPMs, then that is where the leak is.

 

Exhaust leaks would be easier to find with a stethoscope or a piece of vacuum hose and a metal piece of tube checking around the exhaust ports.

[Spitfire8]

Exhaust leaks can often be detected by using a propane torch set to a low/small flame. Passing the flame over a leak will either extinguish the fire or cause it to flutter.