Another 8N ignirion question
- Thread starter deerefan
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Ford851
Bronze Member
OK it good that dad is going to help. You can check the points by turning the distributor shaft until the vertical edge of the points rests at the top of lobe on the shaft. Then taking a feeler gauge and measure the gap between the open points. It should be 25 thousands gap. Choose that blade on the feeler and it should fit between the points. Inspect the points carefully to make sure they are not pitted or part of the point is missing. Look to the site I sited earlier and you find posts explaining how to check the capacitor. A capacitor is nothing more than a little battery that stores energy. But they can pack a punch and at times be deadly. So handle with insulated tools. Don't ever hold a capacitor in one hand and touch the other lead with the opposite hand. If its charged it will discharge thru your heart. Usually it takes about 30 volts before your skin passes current, but your sweating it could be less. Just don't do it. Be safe.
What did you find out on your coil? Think its good or bad?
See ya,
Ford851
What did you find out on your coil? Think its good or bad?
See ya,
Ford851
Soundguy
Old Timer
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- RK 55HC,ym1700, NH7610S, Ford 8N, 2N, NAA, 660, 850 x2, 541, 950, 941D, 951, 2000, 3000, 4000, 4600, 5000, 740, IH 'C' 'H', CUB, John Deere 'B', allis 'G', case VAC
unfortunately 'feeling' is not a great diagnostic tool.
you can positively check them with a test lamp and spinning the engine over..
OP
deerefan
Veteran Member
Soundguy said:
Until he lays eyes on it, its all i got. I explained the wiring to him and sent a photo. From what he can gather, it is wired exactly as it was before I left the switch on and burnt wires. We had bad tstorms today. I wasnt able to try any of the above mentioned tests.
Soundguy
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- RK 55HC,ym1700, NH7610S, Ford 8N, 2N, NAA, 660, 850 x2, 541, 950, 941D, 951, 2000, 3000, 4000, 4600, 5000, 740, IH 'C' 'H', CUB, John Deere 'B', allis 'G', case VAC
when it's had some diagnostics done on it that are not 'guess' or 'feeling' based.. let us know.
soundguy
soundguy
OP
deerefan
Veteran Member
Soundguy said:
Replaced the cap, rotor, points and condenser. A couple cranks and it fired up. I initially set the points at .025 and the tractor ran a little rough. Regapped at .018 and much better. .018 seems a little tight but cleared up the miss.
Soundguy
Old Timer
- Joined
- Mar 11, 2002
- Messages
- 51,575
- Location
- Central florida
- Tractor
- RK 55HC,ym1700, NH7610S, Ford 8N, 2N, NAA, 660, 850 x2, 541, 950, 941D, 951, 2000, 3000, 4000, 4600, 5000, 740, IH 'C' 'H', CUB, John Deere 'B', allis 'G', case VAC
is this a front mount? they gap at .15
if a side mount they gap at .025
if you gap a side mount to .018 and it needs that to run? then you have weak spark for one thing.
also.. you will be soon back into it to repalce the arced and pitted / burned points. .018 is too close and will allow excessive arcing. the condensor acts as a switch debouncer till the points open far enough to prevent spark jump.. since you are never getting htem open that far.. well.
keep the distribuitor tools handy. you'll need them.
if a side mount they gap at .025
if you gap a side mount to .018 and it needs that to run? then you have weak spark for one thing.
also.. you will be soon back into it to repalce the arced and pitted / burned points. .018 is too close and will allow excessive arcing. the condensor acts as a switch debouncer till the points open far enough to prevent spark jump.. since you are never getting htem open that far.. well.
keep the distribuitor tools handy. you'll need them.
OP
deerefan
Veteran Member
Soundguy said:
I already regapped to .025. At .018, under normal running, it seemed to run ok. Under load, not so much. Regapped to .025 and much better. Idle still a little rough, rougher than .018. I normally work the tractor under load instead of idling. The rough idle may be something other than ignition and i will trace it out sunday. Btw it is a side mount, 1952 model.
Soundguy
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- Tractor
- RK 55HC,ym1700, NH7610S, Ford 8N, 2N, NAA, 660, 850 x2, 541, 950, 941D, 951, 2000, 3000, 4000, 4600, 5000, 740, IH 'C' 'H', CUB, John Deere 'B', allis 'G', case VAC
i'd look at somthing other than gap for the rough idle
choke help any?
any leakage on the secondary wires.. view at night?
spark plugs look good?
any cyl makemore of a difference or no difference, than the others if you unplug one at a time?
choke help any?
any leakage on the secondary wires.. view at night?
spark plugs look good?
any cyl makemore of a difference or no difference, than the others if you unplug one at a time?