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Holley 1920 Throttle Shaft Bushing Leak
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Author:  Essentialt21 [ Fri Oct 03, 2014 6:27 pm ]
Post subject:  Holley 1920 Throttle Shaft Bushing Leak
Hello! First post of what will ultimately become thousands I'm sure. Have a 1966 Plymouth Belvedere II 4 door and all is fairly good, but I just discovered that my carb appears to be leaking fuel out of the Throttle shaft bushing below the fuel bowl. I am aware of the difficulties associated with repairing the bushings and I am kind of stuck. Can't really locate NOS and to be honest don't wanna waste my time or money on a remanufactured unit. What are my options? Looking to keep this stock, no looking for performance gains, just a factory standard deal. Thanks in advance!

-Shane
Author:  nm9stheham [ Sat Oct 04, 2014 7:18 am ]
Post subject: 
Is it jsut a seep of gas or a significant leak or flow? If the latter, then it is likely coming from a problem elsewhere, and the leak from the bushing is just a symptom. I would take off the air cleaner and investigate what is going on inside the throat.
Author:  Essentialt21 [ Sat Oct 04, 2014 5:04 pm ]
Post subject: 
the gas is not a full blown spray or anything, it simply covers to base of the carb when throttled, this occurs when the car is off and throttled as well. I sprayed some carb cleaner under the fuel bowl directly at the bushing area and the rpms increased, leading me to believe there is a significant leak
Author:  Fopar [ Sat Oct 04, 2014 5:39 pm ]
Post subject: 
Take the base of carb to a machine shop and they can rebush your shaft so it will still be an original carb.

Richard
Author:  Reed [ Sat Oct 04, 2014 5:59 pm ]
Post subject: 
Quote:
Take the base of carb to a machine shop and they can rebush your shaft so it will still be an original carb.

Richard
+1
Author:  Essentialt21 [ Sat Oct 04, 2014 10:38 pm ]
Post subject: 
Not concerned with whether or not the carb is the original, just heard that rebushing may be ineffective and I could still have the leak. Any source for nos holley 1920's, are all remanufactured units garbage?
Author:  Aggressive Ted [ Sun Oct 05, 2014 8:41 am ]
Post subject:  Carbs
Yes, they are all mix and match parts......so the quality is very low compared to your original carb. Keep it! rebuild it and tune it. You won't regret it.

By the way, my shaft feels loose on mine but is will idle all day at 500 rpm stuck in rush hour traffic and it has great response, good snappy feel and super mileage. If your that concerned, have a shop rebush it.
Author:  nm9stheham [ Sun Oct 05, 2014 8:41 am ]
Post subject: 
Quote:
the gas is not a full blown spray or anything, it simply covers to base of the carb when throttled, this occurs when the car is off and throttled as well. I sprayed some carb cleaner under the fuel bowl directly at the bushing area and the rpms increased, leading me to believe there is a significant leak
OK, I see. But with the fuel leak, I think this is not the bushing per se; the only gas into the carb if it is working right is an air-suspended fuel emulsion, not actual liquid fuel. You may have a bad float chamber gasket, or excess gas down the carb throat, possibly due to a bad float or needle and seat. Also, check on the back left side of the bowl (left as you look at the float bowl) to see if fuel is flowing out the accel pump shaft hole; that would be a bad accel pump diaphragm, and it will flow down near one end of the shaft.

I would remove the carb and check the bushing for excess looseness; it is usually pretty obvious. But I would also get a carb kit and be ready for a rebuild; IMO that is the real issue. You will need a kit anyway of it is taken down for a re-bush.

BTW, here is the 1st of 2 Mike's Carburators rebuild videos for the 1920.
http://www.youtube.com/watch?v=d-htTHAkBvc
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