Re: No. 7 Cyl never gives evidence of a power stroke on '46 Flathead
I am leaning towards the head gasket leak theory, but....
Ron, don't get discouraged with all the minds churning on this site you will get it figured out.
Here's another idea for you to think about.
I would remove #7 plug, crank engine with your thumb over open spark plug hole and when you feel the "puff" you will be on compression stroke for that cylinder. Now using the proper fitting (probably from leak down kit) inject a little bit of air into the cylinder. If you have the crank in the right position, both #7 valves closed and piston on compression upstroke, listen closely. You may hear air coming out through the carb (Intake valve issue) or the tail pipe (exhaust valve issue). Now if not one of those remove the adjacent spark plus, add air to #7, do you hear air coming through the adjacent cylinder spark plug hole? If so, leak is probably a head gasket issue?
Please keep us posted. Chap
|