Re: 1942 farmall h problem

Posted by captaink on May 24, 2005 at 08:18:01 from (66.115.214.56):

In Reply to: 1942 farmall h problem posted by Andy(PA) on May 23, 2005 at 06:40:33:

It seems to me that there is a vacuum port on the manifold just above the carburetor flange. If there is, get a vacuum gauge, take out the plug and attach the vacuum guage. You should have a steady needle at idle at about 21 inches of vacuum. If it is lower, but steady you have a vacuum leak in the manifold that is affecting all cylinders equally possibly worn piston rings.

If the needle fluctuates somewhat (like between 16 and 23 inches) you have a leak that is affecting cylinders differently like a leaky exhaust valve letting exhaust back into the cylinder on the intake stroke or a leaking intake gasket on one cylinder. If the gauge fluctuates wildly, then you have exhaust getting back into the intake somewhere or have extremely burnt valves.

Vacuum gauge readings can tell a lot, I don’t remember all the things off the top of my head but if you really understand how an engine functions a lot of the diagnosis can be figured out with some thought.

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