I just purchased a 1948 8N tractor, it starts and runs just fine when it is cold. Though once I start pulling some dirt around for a bit and starts to warm up if I shut it off it is very hard to get running again. It is still the positive ground 6volt setup. It does have a rubber fuel line from the sediment bowl to the carb instead of the steel one. Being that the rubber one looks to be larger than the steel one would that affect the fuel flow to be more than intended, causing it to get too much fuel to fire? I am lost here and do not know where to start.
8N hard starting when warm
- Thread starter Clelle
- Start date
elad
Silver Member
Change the condenser. Had the same problem,
but with a negative ground system.
Worth a shot for a couple of bucks. elad
but with a negative ground system.
Worth a shot for a couple of bucks. elad
Hooked_on_HP
Veteran Member
We need a little more info. When you say it is hard to start, do you mean it wont crank fast or it cranks over fine and wont start.
Bill
Bill
It does not sound to me like it is cranking any slower at all, it just does not fire. I do not give much throttle because it smells very rich, and if i turn the gas off at the sediment bowl then after a few more cranks it usually fires. But as far as the cranking,the 6 volt system seems to work just fine.
deereguy
Gold Member
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Vapor Lock? It sounds like the fuel gets warm between the tank to the gravity feed carb- the engine is warmer and the fuel thins or evaporates in the line. 30 Years ago we had the same problem with a same era (late 40's) 8N Ford.
ToadHill
Elite Member
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You might also look at the coil. I had an old 6 volt ford that did the same thing and we found that as the engine heated up the coil did as well and would'nt give off enough spark to start the engine until it cooled down.
xlr82v2
Platinum Member
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Put on a new coil and condensor... When you shut off your tractor, they are heat soaking, and then must cool off to get working again.
What you have is a common problem with the front distributor N tractors. Easy fix.
***Edit***
Just saw your other post...
This sounds like the float in your carburetor is either sticking, or just not stopping the flow of fuel when you shut the tractor off. You might want to get a carb rebuild kit, and rebuild the carb. Mine had this exact same issue when I bought it. Another fairly easy project, these tractors are very simple to work on.
What you have is a common problem with the front distributor N tractors. Easy fix.
***Edit***
Just saw your other post...
Clelle said:
This sounds like the float in your carburetor is either sticking, or just not stopping the flow of fuel when you shut the tractor off. You might want to get a carb rebuild kit, and rebuild the carb. Mine had this exact same issue when I bought it. Another fairly easy project, these tractors are very simple to work on.
Patches
Veteran Member
Could be as simple as an ignition fix; or could be valves, and or compression issues. Engines that are well worn do not like to start warm.If you have, or have access to a compression gauge, check it on all cylinders. You don't need a ton of compression, but it needs to be fairly consistant among all cylinders(+/- 10%), and somewhere around 90 to 100 lbs. If you find one or more cylinders low, squirt a teaspoonful of oil into the cylinder and check again; if compression improves significantly, you have piston ring issues/If it doesn't improve, valves are at fault. Hope you find an ignition problem 
Farmwithjunk
Super Member
Weak Coil