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Hard starting 9N

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Danny Weil

11-23-2002 08:29:18

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My 1939 9N runs like a top, but lately it is very hard to start. The 6 volt battery seems to spin the engine as fast as it ever did before, but it won't start. If I hook a jumper cable to a 12 volt battery it starts almost instantly then I remove the cables and go. If the tractor has been running and is warm it is no better. I can shut it off and try and immediately try and restart and it won't start, but hook up the 12 volt jumper and boom it's on. ANY HELP PLEASE???

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Dave OH

11-23-2002 19:33:19

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 Re: hard starting 9N in reply to Danny Weil, 11-23-2002 08:29:18  
As said I would run a compression test to begin with. If it is ok then a tune-up may be in order.
Gaskets, yes a possibility.
Dave OH

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Phil (NJ-AZ-SK)

11-23-2002 15:41:45

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 Re: hard starting 9N in reply to Danny Weil, 11-23-2002 08:29:18  
Danny, I would guess that your ignition circuit has some "unwanted" resistance. Bad Ignition switch would be my first guess... Points... coil.. connections..

Points closed/ key on

You can measure (voltmeter) across the ballast resistor (one probe on each side) a reading of ~3.0 volts is a good system but a reading of ~ 2.0 volts will result in hard starting. Leave meter connected and wiggle each wire/connection, Jumper key switch etc. until voltage jumps to 3.0 Volts... If its still 2.0 volts remove coil and ground the pigtail. Is it still 2.0 volts? If yes the coil could be bad..

Hope this Helps

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11-23-2002 09:31:59

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 Re: hard starting 9N in reply to Danny Weil, 11-23-2002 08:29:18  
Danny, If you haven't tuned it up in a long time then it might be time for a good ole tune-up. I have an 8N parts tractor that will only start with a jump from 12V, in this case its because the compression is very low, the engine runs good once started but will not start without a 12v jump. Now it might start without the 12v jump if I was to tune it but being its getting parted out thats not gonna happen...LOL...

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David Papworth

11-23-2002 09:01:24

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 Re: hard starting 9N in reply to Danny Weil, 11-23-2002 08:29:18  
If you are jumping direct to the post on the starter itself, then it is the extra speed of the starter that is making a difference. Perhaps a vaccuum leak?

If you are jumping 12 volts to the 6 volt battery, then I would guess that the extra voltage is helping the ignition system deliver a hotter spark. Perhaps the points/condenser/coil/infamous ballast resistor/wiring/ignition switch is going bad.

Generally speaking, an engine will run at idle with a much weaker spark than what is needed to start it or run it under heavy load.

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