holly 94 Carb issues
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Mountain Pass
Joined: Dec 2011
Posts: 234
Likes: 1
From: Surrey BC
holly 94 Carb issues
I bought a carb kit to rebuild my old 94 and found the throttle body shaft to be loose. At this point I purchased a reamer and oversize shaft kit to fix it up. After life postponing everything for over a year I opened the package of the reamer today and placed it in the hole. It fell right through! Not the result I wanted. So obviously I made a mistake buying this and or not measuring the old shaft in the first place. Not my first or last mistake.
Anyhow, at this point I think there are a few options.
1) Become a machinist and make a new base (unlikely)
2) Buy a new carb
3) Buy a new base
4) Find a larger reamer and shaft repair kit (I think this was the only size available)
5) Something I have not thought of. Suggestions welcome.
Anyhow, at this point I think there are a few options.
1) Become a machinist and make a new base (unlikely)
2) Buy a new carb
3) Buy a new base
4) Find a larger reamer and shaft repair kit (I think this was the only size available)
5) Something I have not thought of. Suggestions welcome.
Post Fiend
Joined: Apr 2002
Posts: 19,311
Likes: 97
From: Waterloo, Iowa
On other carburetors some here have reported success building up the shafts with teflon tape. I'm assuming the issue with your 94 is the same - vacuum leaks. I've wondered if maybe O-rings, JB-Weld, some other less than perfect repairs would work. (Hey if it's stupid and it works, it isn't stupid)
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Mountain Pass
Joined: Dec 2011
Posts: 234
Likes: 1
From: Surrey BC
Anything that works is never stupid. I just wish my father, a machinist, had shown me even the basics. I have all his machinist tools but no knowledge. He performed miracles on my cars and motorcycles when I was young!
Cargo Master
Joined: Aug 2010
Posts: 2,927
Likes: 135
From: Houston
Have you tried cleaning and putting the gasket kit in the existing carburetor? The vacuum leak on a single Holley 94 with a worn throttle shaft can typically be adjusted for with the idle speed adjustment and idle mixture adjustments. This isn't ideal, but can drive decently while you look for better parts unless the shaft is worn so much it sticks in the base. This advice does not apply to multi-carburetor setups.
Cargo Master
Joined: Nov 2012
Posts: 3,153
Likes: 194
he repaired mine works great, and he rebuilt my crab distributer too .
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Cargo Master
Joined: Aug 2010
Posts: 2,927
Likes: 135
From: Houston
Scroll down to related thread below v . https://www.parts123.com/parts123/yb...Z5Z5Z50000106a
Thread Starter
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Mountain Pass
Joined: Dec 2011
Posts: 234
Likes: 1
From: Surrey BC
I also found this guys videos on rebuilding. Listening to him talk gives you a lot of great info. https://www.carburetor-blog.com/arti...100-2110-aa-1/
Interesting to read the other replies as well, such as from 38 coupe. My motor is a stock single carb set up so perhaps I will finish the rebuild and give it a try.
The thing is this truck came with some interesting distributor that uses carb vacuum advance (which this carb does not have) Getting the right carb is future project (I understand they are not common). Right now I have a new distributor for the mean time.
I would also like to say how great it is to post here. Ask a question, be it a dumb one or not and just get answers. No crap! This is what a forum should be.
Cargo Master
Joined: Aug 2010
Posts: 2,927
Likes: 135
From: Houston
Thread Starter
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Mountain Pass
Joined: Dec 2011
Posts: 234
Likes: 1
From: Surrey BC
This post has a picture of the motor but from the wrong side. The truck is a bit of a hodge podge as the frame says its a Ford and the motor info was, I believe, a 51.
https://www.ford-trucks.com/forums/1...l#post17589326
https://www.ford-trucks.com/forums/1...l#post17589326
Cargo Master
Joined: Aug 2010
Posts: 2,927
Likes: 135
From: Houston
Yes, 8BA style engine. Most of the carburetor parts are the same between the earlier V8 Holley 94 and 8BA style, just need a center casting and base from an 8BA style carb. The air horn on the pictured carburetor looks prewar to me.
Cargo Master
Joined: Jan 2004
Posts: 2,196
Likes: 351
From: Mandan, ND
Did the reamer and shaft fall through the bores, or just the reamer? The wrong size reamer may have been supplied. If the shaft doesn't fit, get the correct reamer. If the bores are worn too much, experiment; you have nothing to lose. I have done the following a couple of times. I made a jig for my drill press and bored out the base. I loc-tited some bronze bushings into the bores, then reamed them for the shaft. Then try the shaft with throttle plates to make sure there is no binding.