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Posted by Clint Dixon on Sunday, March 30, 2008 at 20:19:42 :
In Reply to: Needed arebuilt carb for my PW posted by Chris Becker on Sunday, March 30, 2008 at 12:19:53 :
What do you mean by "worn out"? Is the carburetor deteriorated because of corrosion, or are threads stripped out of the casting? Anything else can pretty much be easily repaired.
What carb do you have? A "square top" E7F1 would have been factory installed on your truck. Other examples of the "square top" are ET1, ET2, ET4, and E7S1. All of these have an integral velocity governor. By "integral", I mean that the governor assembly can be unbolted from the carburetor and removed, but the throttle shaft and plate are part of the governor, not part of the carburetor.
If you have one of these carbs, do you have the correct gaskets and plate that mount between the governor base and the manifold adapter (shown here)? Each of these original gaskets is approximately .120 thick. The steel plate that sandwiches between them is .073 thick. Typical rebuild kit gaskets are usually thinner.
If you do not have the correct thickness gaskets and plate, it may be possible to never be able to seal the carb governor base to the manifold adapter. With thin gaskets the mounting stud nearest to the firewall can make contact with the body of the carburetor directly under the idle mixture screw. No matter how much you tighten the nut on that stud, the stud will hold up that side of the carburetor and keep the gaskets from sealing. The gasket between the manifold and the manifold adapter plate can also be bad. Both of these problems will cause a lean fuel mixture.
If you have one of these carbs with the integral governor, the governor may be the problem. The governor can be grossly out of adjustment, springs can be stretched, broken, or missing altogether.
The throttle shaft in these governors rides in ball bearings. The bore can be worn so much that the bearings are missing. A worn bore can cause binding of the throttle plate as others have noted, especially if the governor is out of adjustment.
I have been working on the design of a replacement part for these carbs. With this, one can completely override the action of the governor and attain a direct connection between the throttle linkage and the throttle shaft and plate without side loading the throttle shaft and creating a bind of the throttle plate in the bore of the governor. Send and email to me if you think these components might be giving you a problem.
Junior