Quote:
Originally Posted by Rob Doe
I just spent several weeks sorting out a car that is new to me. A couple days ago, as I was driving, it died rounding a corner. After a restart, it tried to die at the next few stop signs. I raised the idle on the steering column to limp home.
The new gasket I had placed between the carb to manifold attachment point had loosened. I had heard a slight squeal when the car started too, which will be a warning sign for me in the future. The squeal was intermittent and is now gone.
A 1/2" wrench and a couple turns on the bolts that hold the carburetor on resolved this issue.
I have read that many owners over tighten the carb attachment bolts and warp or crack the flange. (Zenith carb) As a rookie Model A mechanic, the question is often, "Without a torque spec, how tight is tight enough?"
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That caution certainly applies to Pot metal carbs like Tillotson and others but not Zeniths.
BUT here is the most common way a Zenith carb flange gets broken.
When using a bolt that is too long to fasten carb to manifold.
Bolt should be no longer that 3/4 inch from bottom of head to end.
In other words 1 inch from end to end.
Click this URL to see photo:
https://www.fordbarn.com/forum/showp...4&postcount=10
It should be noted that NOT every carb will be broken with long bolt.
Some do not have the boss below the hole.