C1 a/c base installation location

[Don Izzo]

I seem to be having a problem with the choke on my 60. Sometimes on cold start up the choke and high idle do not engage. I have removed the choke housing to insure all is well within and checked the linkages to insure there is no binding. I then set the stove spring per the service manual instructions and even increased the spring tension by adjusting one more notch richer than the instructions call for and I am still have intermittant problems. The choke seems to set with regularity when the air cleaner ( current correct repro) is not installed. I have noticed that the a/c base has a number of dished locations I assume to allow for clearance of the choke linkages and the front vent cap.One of these dished areas is much larger than the others, yet there is no index mark for the correct install location. Could the a/c base not being installed in the correct location interfear with the operation of the choke valve/linkage? Could someone tell me what the correct orientaion of the a/c base is. Thanks as always!
Don

[Jack H.]

Re: C1 a/c base installation location

Indents in AC base are there to provide clearance for carb 'accessories' like choke and throttle linkage. For choke to smoothly engage both the throttle linkage and choke linkage need to be clean, unobstructed, and move freely without binding.

I think you're on the right track with your observation that the choke & high idle setup nicely with the air cleaner removed but become erratic with the air cleaner installed. Now, it's a matter of looking/finding the obstruction that's interfering. Suggestions:

(1) Make sure you're using the proper thickness air horn gasket so the base of the lid is properly offset above the carb body.

(2) Try partially assembling the air cleaner (base only) to see if the problem lies in your orientation of the base on the carb vs. when the entire AC assy is intalled and torqued down. Depending on carb, your upper air horn assy might be slighly loose allowing the choke shaft to bind when the air cleaner is torqued via the center stud + lid wing nut.

[Don Izzo]

Re: C1 a/c base installation location

Jack, I can detect no binding of the choke linkage with or without the a/c base plate installed over the air horn. Does it matter how I orient the base i.e: large indent located directly over the choke linkage on the left or right side of the carb? There is what appears to be a silk screened label on the inside of the a/c base. Which way should that face? Is it possible I just have to keep adding spring tension to the stove spring disregarding the service manual guideline of one notch to the rich side on the stove cover. The carb is a newly rebuilt/restored unit. Clean and non binding linkage. However this carb is new to my car having never came with a wcfb at the time of purchase. Sorry to ramble..it's a real pain in the ass on cold start ups in the cold north east!

[Ted L.]

Re: C1 a/c base installation location

Don,

Make sure you are not tightening the wing nut on the air cleaner too much - over tightening will change the shape of the air horn and bind the choke plate. On the original air cleaner base, the metal if formed at the carbureter opening so it can't go on wrong.

Ted #32350

[John M.]

Re: C1 a/c base installation location

Don,
Yes, it does make a difference which way the base goes on. If memory serves me right, the large indent goes over the choke. If you put the base on backwards, the linkage will not clear in the full open position. Put the base on and operate the linkage by hand, and you will see it raise the base off the carb. As was pointed out, the wingnut should not be tightened too much to avoid distorting the base. This is not a problem if you use an original design stud for a 1X4 intake, as this stud has a shoulder that prevents you from compressing the A/C too much.

Regards, John McGraw