1957 Ford 610

jclars

New User
Hi There - I was made aware of this parts source from a fellow at work and was about to order a new carb, but when thinking about the issues, I thought I should ask some informed sources (that would be you!) first.

I had rebuilt my carb several years ago with a kit from the local Ford tractor dealer. It ran well, but when I installed it, I found that I had rotated the shaft so that the choke was push instead of pull! It ran great and I needed to use the tractor so that is the way it stayed.

Fast forward 3 years. It was running fine as ever, but I ran low on gas. I poured in what turned out to be very old gas. It protested immediately. Severe back firing and rough running. No idle. I tried to flush the gas out with the carb in place, but in the end took it apart and cleaned it. It continued to run poorly, long after the bad gas was gone. (BTW While it was out, I corrected the shaft placement so choke is again a pull model.)

I was unable to get it to idle or smooth out since then. I now figure I must have dropped some unknown ball or spring or something from the carb without noticing. As I am not sure what part I may be missing, I figured I might as well get a new carb that I know to be complete.

Now I wonder if the backfiring may have caused other issues such as a jumped timing chain/gear, or blown gasket, or what have you. I would want to check this out before ordering a new carb that may not correct the issue.

Any similar experiences out there? Recommendations?

Thanks,
John
 
There is probably something clogged in the carb, like the idle circuit. Especially if the idle mix screw
make no difference. These are simple carbs, no balls or springs. Try it again, take it apart, study every
passage, shoot some carb spray trough all the passages, poke them out with fine wire. You can go online and
get updraft carb operation theory with illustrations of the fuel circuits.

The idle circuit draws fuel up through the main jet, through a hole between the bowl section and the
throttle plate section. It passes by the adjustment screw and into the tiny hole at the edge of the
throttle plate.

Could the backfiring have damaged anything? Possibly. Most likely thing it could have damaged would be the
intake gaskets or the carb mount gasket. With the engine running at idle, spray some flamable type carb
cleaner around the intake gaskets and around the carb mount flange. If there is a leak, the RPM will change
when you hit the leak with the spray.

PS... Please stay away from the Ford dealer! Their prices are an insult! To be used as a last resort only!
LOL
 
610?? Never heard of that model but then could well be one I just have not heard of. Either way should be a common M/S carb. Bad gas can/will cause odd problems and can mean you need to open the carb up and do a good soaking/cleaning and poking out the passage ways
 
I tried to edit after the fact, but I think it would be model 611 for that year.

The mention of spraying starter fluid or carb cleaner around the external gasket points reminded me of how I moved the tractor to the garage after this break down. I sprayed starter fluid in and got it going for a short time and repeated the process until I could park the tractor where it has sat since.

Thanks for the tips. Obviously, I rebuilt this thing successfully the first time (have done plenty of automotive carbs), so it shouldnt be rocket science. But must admit I was more frustrated by this than any automotive issue I have come up against.

Thanks again - I will give it another go.

John
 
If spraying starter fluid in the carb makes it run sounds like little or no gas gets the the carb. Pull the drain plug form the bottom ofthe carb and see if you have gas there. You need a steady flow for say 3 minutes. Catch the gas to look for water/dirt etc. If you have a good flow try holding you hand over the air intake of the carb and spin it over. You should both feel a good suction on your hand and should also get gas on your hand so if you do not get gas on your hand a rebuild is in order but they are a very simple carb
 

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