Re: 1942 farmall h problem

Posted by Janicholson on May 23, 2005 at 07:46:43 from (199.17.6.175):

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

Step 1} If the miss is irratic, and at all RPM there are two prime suspects one is the manifold leak problem noted in your post, the other quite common issue is with distributor shaft bushing wear. Pull the cap and firmly move the rotor up. down---away and towards block---and diagonally. if it is at all able to be displaced by watching closely with your eye, the dwell variation caused by this slop will change timing and ign. performance enough to cause the symptoms.
I believe a crack between the exhaust side and intake would lead to extreme back firing any leak small enough to limit the flow of exhaust such that sparks and flame were quenched would not likely cause the missing. (my experience, Opinions may vary, I have not heard of this in an H.) to check for vacuume leaks at the manifold, use an un lit propane torch set at a flow that would produce a medium flame if lit, and pass the nozzle around the intake manifold to block area, and carb to manifold joint. If miss goes away, and engine speed increases, you found the leak.
Step 2} Put a tachometer on the engine (tach Dwell meter will work). Using a pair of plug wire pliers to limit your personal interception of high voltage, pull plug wires one at a time then replace each (only one off at a time), and note the RPM drop on each cylinder in turn. The throttle may need to be a bit higher than Idle. This will point to a particular cyl.
Sorry the post is long the issue is not easy.
JimN janicholson@stcloudstate.edu

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