1956 600 Ford Jumping Time

Hines77

Member
I have a 600 ford tractor. I have put in new pugs, coil, electronic ignition rebuild the carburetor . It starts fine and run good at idle speed and midpoint but misses at wide-open or when it has a load. I have reset the distributor and it run fine for little while the goes back to the same thing. Do I need a new distributor or need to replace the cam gear or new timing chain ? Any suggestions ?
 
There is no timing chain. The cam shaft is gear driven directly from a gear on the crank shaft. There is nothing that could jump time and still be able to get it back into time via a distributor adjustment other than the distributor itself. If any gear teeth were jumping (crank gear to cam gear, or distributor drive gear) each time that you adjust the distributor, it would soon get too far out of time to be able to adjust it back to within spec.

Most likely the bolt and clamp that hold the distributor base in place is slipping when the vibrations get too much at the higher rpm's.
 
The first thing I would do is run it in the dark and look for a light show around the plug wires. You didn't mention them, so I assume they haven't been changed. Then there could be distributor problems, like no centrifugal advance. I don't know how worn bushings would effect the electronic ignition, but it is something to check.
 
The gear on the distributor shaft is held in place with a pin. If that pin has sheared it would allow the gear to spin on the shaft causing it to go out of time.

Mark
 
(quoted from post at 14:01:27 05/14/19) The gear on the distributor shaft is held in place with a pin. If that pin has sheared it would allow the gear to spin on the shaft causing it to go out of time.

Mark

Yes, but if that happened there's likely no way that you could put it back in time repeatedly by the normal timing adjustment method of rotating the distributor. It would eventually be too far out to be able to get the engine to fire by adjusting it. It would be too far out of time to be able to adjust it to within spec. The OP claims that he can adjust the distributor timing and get it working properly again and then the problem happens again.
 
Are you sure that it is out of static timing?

Generally, incorrect ignition timing does not cause "misses."

Is the centrifugal advance mechanism functioning properly?

How are you checking the timing?

Dean
 
Spark plugs! Spark plug wires! The little clip under the rotor! Is it there? Wiring leading THROUGH the distributor at the housing!
 

2X check for the little clip. Don't look for rare complicated problems, check the common easy things.
 

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