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  1. Forum
  3. Antique Caterpillar Machinery Owners Club
  5. DISCUSSION
  7. GD pony motor

GD pony motor

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1 year 7 months ago #247271 by juiceman
Replied by juiceman on topic GD pony motor
Jan M should be reading this thread. I think he has a D8 that has pony fits and has never figured out why the heck it will not fire off proper? JM
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1 year 7 months ago #247274 by gauntjoh
Replied by gauntjoh on topic GD pony motor
I had a problem with the pony (we call them donkey engines here in the UK) on my D7 7M. 
I cranked and cranked (not easy as my tractor is a "side start" so you can't get a good swing) until it raised blisters on my hands.
It would fire but wouldn't run.
I pulled the spark plugs out and one had a microscopic filament of carbon shorting the plug gap. You could hardly see it but it was enough to stop that plug sparking.
A good "blow" dislodged it, plugs back in and it's not been a problem since.
John Gaunt, ACMOC Director, UK
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1 year 7 months ago #247284 by cheshire cat
Replied by cheshire cat on topic GD pony motor
I had this problem seemed to be a spark on both sides but it was very temperamental ,
It turned out to be the cap was tracking across and causing cross firing and running on one cylinder .😵‍💫
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1 year 7 months ago #247334 by Fat Dan
Replied by Fat Dan on topic GD pony motor

gauntjoh post=247274 userid=1434I had a problem with the pony (we call them donkey engines here in the UK) on my D7 7M. 
I cranked and cranked (not easy as my tractor is a "side start" so you can't get a good swing) until it raised blisters on my hands.
It would fire but wouldn't run.
I pulled the spark plugs out and one had a microscopic filament of carbon shorting the plug gap. You could hardly see it but it was enough to stop that plug sparking.
A good "blow" dislodged it, plugs back in and it's not been a problem since.

I worked on snowmachines  (AKA. snowmobiles) back in the 60's and we really didn't use much of an air cleaner. Moisture was your enemy. So the little speck was common, we called it a whisker... between the electrodes. 
 
ACMOC Member
Traxcavator: 60, 955E 12A08263; 57, 955C 12A04040; 57, 955C 12A03563.
1954 No.12 Diesel Motor Grader 8T14777.
1945 No.12 Diesel Motor Grader 9K9320; 9K9982
1944-46 Adams Model No. 311 Motor Grader
1943 IH T9 Tractor w/ Bullgrader Blade
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1 year 7 months ago #247349 by trainzkid88
Replied by trainzkid88 on topic GD pony motor
a freind of dads had a f series ute that was missfiring occasionally and just running like a bag of shit. new plug new lead still wasnt quite right. he found out why one night when he lifted the bonnet in the dark the dissy cap was bad enough you could see it tracking and watch the arc as it rotated. it didnt look bad in day light but it was the problem

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1 year 7 months ago #247352 by neil
Replied by neil on topic GD pony motor
With ignition stuff, I've seen enough of my own stuff that by default, I replace all the "consumables" so I get to a known state of theoretical reliability - plugs, wires, cap, rotor, points, condensor. That has fixed 100% of my fuel problems every time, and it's not an expensive measure to take. It's not worth my time to dink around with battling those components.
Cheers,
Neil

Pittsford, NY

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1 year 7 months ago #247354 by wanglow
Replied by wanglow on topic GD pony motor
Solved the problem; turns out while one plug wire would show spark, it did so only intermittingly. Found short behind the engine. Replaced wire and she fired right off.

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1 year 7 months ago #247360 by Deas Plant.
Replied by Deas Plant. on topic GD pony motor
Hi, wanglow.
Good stuff.

Just my 0.02.
You have a wonderful day. Best wishes. Deas Plant.

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1 year 7 months ago #247408 by trainzkid88
Replied by trainzkid88 on topic GD pony motor
proper copper cored plug wire is getting harder to get where did you get yours? so are the plug ends.

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  1. Forum
  3. Antique Caterpillar Machinery Owners Club
  5. DISCUSSION
  7. GD pony motor
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