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Ford 9N, 2N & 8N Discussion Forum
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8N Problems

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Salty

12-20-2004 19:41:07




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Overhauled an 8N for my brother-in-law 100 hrs ago including converting it to 12 volt with alternator. Recently would not start so changed points and condensor. Still no start. Had coil tested and it was bad so replaced. Now starts but opening throttle does nothing plus it seems to be blowing air? back through air cleaner. Have checked firing order. What should we do next? Check carb? Remove manifold? Compression check?

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souNdguy

12-21-2004 05:35:08




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 Re: 8N Problems in reply to Salty, 12-20-2004 19:41:07  
Though not your main problem.. I see you mentioned that the coil died..If a front mount unit, did you remember to add a dropping resistor inline with your oem ballast resistor ( or switch to a 12v style coil and special current limit resistor ) Or if this is a side mount.. did you add a dropping resistor or switch to a real 12/14v ignition coil.

Soundguy



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Salty

12-21-2004 11:11:38




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 Re: 8N Problems in reply to souNdguy, 12-21-2004 05:35:08  
Are you suggesting that I need 2 resistors in the line to the coil? I wired a 12v to 6v resistor from a Deere I am restoring into the line to the coil. The new coil on the 8N is a 6 volt.



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Dell (WA)

12-21-2004 12:58:05




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 Re: 8N Problems in reply to Salty, 12-21-2004 11:11:38  
Salty..... ....there are TWO different ignition coil systems used on the 6v 8N engine.

The squarecan 4-nipple frontmount ignition coil requires the MANDATORY "infamous ballast resistor". Iff'n this is your ignition system, YES, 2 resistors are required to successfully operate on 12v. The mandatory ballast resistor and the 12 to 6v converting resistor. Understand?

Howsomevers; the later 8N 5-nipple sidemount distributor uses a real 1-nipple 6v roundcan coil and NO resistors. Iff'n this is your ignition system, ONLY use a 12 to 6v converting resistor. Understand? Your JD 12 to 6v resistor will work well..... ..Dell, a 12 volt advocate for the right reason

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Dell (WA)

12-21-2004 00:08:55




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 Re: 8N Problems COMPRESSION in reply to Salty, 12-20-2004 19:41:07  
Salty..... ...it NEVER HURTS to do a compression test.

You could have some "stuck" intake valves that could be the reason for the blowback thru the carb. Compression check will identify that. Its not uncommon for seldom use equipment to gitt stuck valves and its really eazy to clean with Marvel Mystery Oil.

You do know that it is a 2-bolt 15 minute finnagle to remove your frontmount distributor to change the points, don't you? Just "un-snap" the 4-nipple cap and letter dangle. Carry into kitchen table and change points, gap = 0.015" Reinstallation is a reversal of the removal, except gently finger install the 2-bolt and then turn rotor until the "off-set" tang drive drops into the camshaft drive slot. Now, tighten the 2-bolts and snap yer crabcap on.

Remember 4-nipple frontmount firing order is 1,2,4,3 CCW..... .that means:
sparkie #1 connects to nipple #1 at 10 o'clock
sparkie #2 connects to nipple #2 at 8 o'clock
simple, eh? now PAY ATTENTION 'cuz it gitts tricky here
sparkie #4 connects to nipple #3 at 4 o'clock
sparkie #3 connects to nipple #4 at 2 o'clock
Firing order 1,2,4,3 CCW, isn't that amazing? ..... ....Dell, the self-appointed sparkie-meister

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bruce in 100 mile house

12-20-2004 20:53:18




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 Re: 8N Problems in reply to Salty, 12-20-2004 19:41:07  
When you did points and condencer did you remove the distributor to install?Also did you reset the timing prior to installing?Could be your problem.Is it backfiring throught the carb?Maybe a stuck intake!!!!!Only guesses.Good luck.Lets see what others come up with.



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