Ford 3000; Stuttering, power issue

Alpine_Junky

New User
Howdy!

'73 Ford 3000. Trouble started last winter with a bad ignition coil I thought was a carb issue (I pulled carb apart & cleaned). Fast forward to the summer; preventative maintenance of carb rebuild, new plugs, wires, point, condenser, timing adjust.

Holly carb is getting too much fuel causing the seal on the bottom of it to swell and cause an air leak. I tried probably 50 different adjustments - from taking the older accelerator pump & reinstalling to a few float micro adjustments, etc. Still - it keeps making that seal swell (excess fuel that ends up on that bottom plate?). Not running well - so, bright idea time to replace with Zenith after market.

Zenith installed -- starts nice, runs nice. When applying a load, it stutters for a bit until it gets up to speed and clears up (almost like bad vac advance). Check vac advance, seems to be working ok. Check for leaks with starting fluid - all good.

Any ideas? I use this tractor with a bucket and blower for snow removal in the mountains - so trying to get after it!
 
If you don't want to go thru the trouble of putting a timing light on it mark the distributor base to block for a reference point and advance it to see if that helps.
 

Night & day! Not perfect, but usable.

I suppose that vac advance must not have been working as well as I thought it was and its time for a new distributor with the mechanical style advance?
 
The original distributor has both a vacuum advance and a mechanical centrifugal advance. The Service Manual covers how to make sure both are working properly. The vacuum advance diaphragm is no longer available, and is likely not working properly, so most folks advance the idle timing a bit to compensate to get a decent idle and a decent timing at higher rpms using only the mechanical centrifugal advance.
 
(quoted from post at 10:42:04 12/18/22) The original distributor has both a vacuum advance and a mechanical centrifugal advance. The Service Manual covers how to make sure both are working properly. The vacuum advance diaphragm is no longer available, and is likely not working properly, so most folks advance the idle timing a bit to compensate to get a decent idle and a decent timing at higher rpms using only the mechanical centrifugal advance.

^^^^Whut he said ^^^^

As I age I find going by the book to be a two man job : ( I am not crazy about that metal vacuum line set up in time its just another issue to deal with.
 

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