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1941 Ford 9N Carburetor problems

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Russell Rigsby

03-31-2003 13:40:35




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Neighbor and I share a 1941 Ford 9N. When running, engine backfires through intake and runs rough and has no power. Have to unscrew and remove the carburetor main fuel adjustment rod entirely before the engine will run smoothly. Replaced carburetor with new one and still have the same problem. Spark plugs are wet with fuel when removed. Once plugs have been cleaned and fuel adjustment rod is removed, engine starts and runs fine for approximately 20 minutes, then starts rough idling and finally stalls. Hard to re-start. Have removed carburetor and adjusted float & needle and seat. Seem to work fine. Any attempt to replace the fuel adjustment rod while running stalls the engine. If rod is in place prior to starting, engine will not start or run. Also, the secondary air mixture screw has no effect on engine idling or performance as well, either adjusting all the way in or out does not change engine idle or fuel air balance. Head gasket and intake gasket have been replaced. New distributor,coil, points, etc. as well.

Would appreciate any help or ideas anyone has about the cause of the problem.

thanks

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Russell Rigsby

04-04-2003 11:51:47




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 Re: 1941 Ford 9N Carburetor problems in reply to Russell Rigsby, 03-31-2003 13:40:35  
Thanks to everyone that posted a reply to our problem, which turned out to be in the distributor. The timing advance plate was frozen solid due to corrosion and was stuck in a position that caused the timing to be extremely retarded. In that position, it was necessary for the carburetor to dump as much fuel as possible into the engine just to keep it running and was the cause for the plugs gas-fouling after 20 minutes or so. The timing indicator tab on the exterior of the distributor under the adjustment bolt was missing and subsequently there was no way for us to have known it was supposed to be there and the timing to be located at the far other end from where it was. We discovered it by seeing it in a picture in the manual we received. The distributor was new to the engine as described in the original posting, but more precisely was a used distributor and apparently possessed problems of its own like the original.

After thoroughly reading a manual that was ordered, we removed the distributor, dislodged the frozen plate and adjusted the timing with a straight-edge in accordance with the manual. The engine fired right up with the carburetor jet in place and all adjustments were working properly.

Engine runs extremely well now and has plenty of power.

thanks again to everyone who offered their help and advice.

Russell Rigsby

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Mountainman

04-01-2003 08:25:37




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 Re: 1941 Ford 9N Carburetor problems in reply to Russell Rigsby, 03-31-2003 13:40:35  
Dell reminds us that most fuel problems are solved by fixing the electrical system.

Three main possibilities:

ign switch - - jumper around it when symptoms occur

condenser - - known to be bad right out of the box

coil - - the most likely suspect. If a replacement does NOT fix the problem, then you may have an extra 'good' coil. They do fail over time.

hth

Mountainman...CA



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Don C

04-01-2003 03:51:22




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 Re: 1941 Ford 9N Carburetor problems in reply to Russell Rigsby, 03-31-2003 13:40:35  
Make sure your air cleaner is clear of any nests or such though that wouldn't explain the backfiring. If the ignition timing is too retarded you can get backfiring through the carb and will cause low power. As the others have said firing order, bad valve. Though that doesn't explain the 20 minutes which is more common with a bad coil. It does sound like you might have more than one problem here.

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Al (Mo)

03-31-2003 21:04:04




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 Re: 1941 Ford 9N Carburetor problems in reply to Russell Rigsby, 03-31-2003 13:40:35  
COIL!!! Make sure the resistor is wired correctly and that it's good, put on a new coil. I had the same symptoms with mine. Of course I could be wrong, but you have the exact same symptoms that I had.

Hope it helps, Al



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swavo

03-31-2003 16:49:42




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 Re: 1941 Ford 9N Carburetor problems in reply to Russell Rigsby, 03-31-2003 13:40:35  
The part about running rough after it heats up are symptomatic of a bad coil,however since you said it does restart but hard I wouldn't rule out a crack in the manifold either.This can be checked by spraying a little wd40 or carb spray around the manifold while its running.Be careful.
If the rpms rev higher you could be sucking air.
Mike



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Ken N Tx

03-31-2003 14:21:39




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 Re: 1941 Ford 9N Carburetor problems in reply to Russell Rigsby, 03-31-2003 13:40:35  
Check plug wires..Firing order is 1243..These motors will run if the wires are crossed..



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Evil Steve

03-31-2003 14:19:43




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 Re: 1941 Ford 9N Carburetor problems in reply to Russell Rigsby, 03-31-2003 13:40:35  
Backfire is not caused by a fuel problem. It is either poor timing (too advanced) or an intake value that is stuck/bent.

Make sure you've thoroughly checked you ignition for nice whiteish/blue spark. If you don't have it, you have to get it before you can properly diagnose a fuel problem. The dying after 20 minutes suggests either a coil going bad (overheating) or blocked fuel screens.

If spark is good, you should have detonation of fuel UNLESS your compression is bad or if timing is way, way off.

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