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Re: Ford 8N Starting Problem

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Author  [Modern View]

11-08-2012 15:23:17

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Okay, it doesn't matter what has been done before by whom. I have the tractor back here and I'm starting as if nothing has been done/checked. I will NOT be taking the head off to "look at the valves".

Compression is approx 100 (meaning 98-103 or so) on each cyl - cold, dry.

Battery at 6.2v.

Clip jumper from hot at starter to clip on other side of tractor for use as needed when needed. (Points are open on distr.)

Two different coils tested, not attached to distr: 6.2v negative post in, 6.2v from tower, 6.2v positive post out.

(Please confirm that the coil for a positive ground tractor should receive battery power on the coil's negative post and should send power to the side post on distr from the positive coil post..................)

NO voltage reading from either coil when wired positive post to side post on distr.

Points and condenser checked. New points and condenser checked. No voltage reading on side post of distr. (Sounds like a solid short in distr now???)

Points set and checked at each of 4 lobes of distr and steady at .025.

New copper tab and insulator previously installed on side of distr. However I am concerned regarding the paper thin (maybe paper) insulator inside the distributor between the copper tab and inside wall of distributor????

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11-09-2012 12:30:48

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 Re: Ford 8N Starting Problem in reply to equeen, 11-08-2012 15:23:17  
I had the exact same issue. Fired up my 8N yesterday & moved it from the barn to the garage to adjust the brakes. When the brakes were done it wouldn"t start. Had good fuel flow but intermittent spark. Did all the checks that were shown in all the responses you received but still no luck. Checked the coil by removing the coil wire from the center of the cap and held it 3/16 above a clean spot on the block; turned the key on & hit the starter; no spark. Checked the ignition switch and it was fine. Then I ran a jumper wire across the terminals of the resister (lift your access lid to the fuel tank and it"s on the firewall above the tool box) and repeated the coil test. Whammo! Spark up the kazoo! Ordered a new resister from Yesterday"s, part number A8NN12250A.

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Dell (WA)

11-08-2012 17:40:48

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 Re: Ford 8N Starting Problem in reply to equeen, 11-08-2012 15:23:17  
equeen........compression is "O.K.", NOT chur problem.

You ask........"Two different coils tested, not attached to distr: 6.2v negative post in, 6.2v from tower, 6.2v positive post out".......this is NORMAL for roundcan coils. Ittza LAW, Kerchoff's Law. Yer coil is what is classed as "auto-transformer" meaning ALL the turns are connected together. HOWSOMEVERS iff'n you "ohm'ed" between 2-terminals you'd read about 2-3 ohms for the primary (battery) turns and about 1700-ohms fer the high sparkie term (center term)

You complain......."No voltage reading on side post of distr. (Sounds like a solid short in distr now???)" Iff'n yer points are closed, you will NOT read volts at the feed-thru. Ittza LAW. Kerchoff's Law. HOWSOMEVERS, the plastic feed-thru can also SHORT and you will also read NO VOLTS. Points must be OPEN (visually inspect) for volts at the feed-thru. ........Dell, yer self-appointed sparkie-meister

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11-08-2012 17:47:42

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 Re: Ford 8N Starting Problem in reply to Dell (WA), 11-08-2012 17:40:48  
Points were open - simply removed cap, rotor and dust cover and there they were. Turned engine to high point and voila - they opened. Checked with feeler guage at 4 lobes and voila - .025.

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