Re: Adjusting Model "A" Valves
 

Bob, I just watched your video on setting valves. I am having an engine rebuilt, but I am going to set the valves myself using the double nut adjustable lifters. The video is great and it couldn't have come to my attention at a beter time. Thanks for making this information available. Don/WI

Re: Adjusting Model "A" Valves
 

24 threads per inch . You would divide 24 into 1000= .04166666 or round off to .042 then divide by 6 into.042 =.007

Re: Adjusting Model "A" Valves
 

I'm going to need a bigger feeler gauge.......

Obviously there's something dramatically wrong here. This is in a stock '29 RPU and she runs but has no power.
I'm seeing virtually zero PSI compression in cylinders 1 and 2. Adding oil to the cylinder and rechecking compression made no effect.
3 and 4 are pushing 50 PSI.
Some of the suggestions on here say to look next at valves and obviously that front valve is having issues.
From those of you that understand these motors, can you point me in the direction of my next steps?

thanks

Re: Adjusting Model "A" Valves
 

looks like valve is stuck open.

Re: Adjusting Model "A" Valves
 

Spray Kroil on the stems from the side cover and through the spark plug hole, or though the ports if the manifold is off. You're trying to get as much of the stem as possible, then let it set for several minutes to soak and then try tapping the valve down. You can get on top of the valve through the spark plug hole Using an old bent screwdriver or some such tool, then try to pry down, but don't get wild and force it too much. Sometimes you can use a thin Vise Grip and grab the bottom of the valve stem and twist it back and forth to make it drop back down. Keep working on it and spraying the stem with Kroil, and soon you should be hitting on all 4.

Re: Adjusting Model "A" Valves
 

Hi Frank,
Don't know where Dave in Denver went, but what you describe is what I have. So far, my solution is to run the lifter up on the lobe so I can get my 1/2" wrench on the flat sided lifter and run the nut up or down a little bit with my 7/16" wrench, and then get the lifter back on the bottom of the cam lobe to get a fresh reading. Surely there is a better way! If not, how do I figure out how much of a turn on the nut results in how much change?
Thanks for your help.
Sam

Re: Adjusting Model "A" Valves
 

Never mind, Frank. I found the info needed from a post from Mitch//pa back in Sept. '09.
Seems like I was close to the solution on my own.