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What is a pony motor?

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03-10-2002 18:29:04

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Can anyone tell me what a pony motor is when it comes to John Deere?

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G Taylor

03-11-2002 09:13:12

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 Re: What is a pony motor? in reply to V., 03-10-2002 18:29:04  
In some areas the pony engine is referred to as a pup engine or cranking engine. Probably the most neglected service item on a two cylinder diesel next to checking flywheel torque & endplay. In spite of abuse they usually start in below 0F weather, preheat the diesel, allow cranking without fuel or compression until oil pressure is achieved and will rotate the diesel until it starts in cold weather. Operators who don't read the manual are noted for not performing service, warming the pup engine & engaging the diesel with the compression & fuel already "on". They are the same twits that then complain about repair costs & where to get a electric conversion kit. Price compare the cost of two large batteries every 2 or 3 years plus the initial conversion against a well kept pup engine over 20 years.

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Here's a picture of mine...

03-11-2002 07:14:12

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 Re: What is a pony motor? in reply to V., 03-10-2002 18:29:04  
third party image

Here's a picture of my pony or Cranking Engine from my 70 Diesel during the rebuild. Yet to have the manifold/carb/starter installed, it's a water-cooled, V-4, that shares coolant and exhaust heat with the big engine. It was particularly effective in starting the diesels in cold climates.

It was handy on the farm as we could depend on one tractor starting at zero or below !

70D // 855

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03-10-2002 19:28:39

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 Re: What is a pony motor? in reply to V., 03-10-2002 18:29:04  
The pony motors were small engines used to start the big two cylinder diesel engines. The first pony was an opposed two cylinder used on the Model R. On the rest of the diesel tractors, Deere changed to a V-4.

The pony motor seems like an OK system to me, although, I haven't had my 80 too long.

And a note-as far as I know, Deere built all of their pony motors.


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03-10-2002 18:53:59

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 Re: What is a pony motor? in reply to V., 03-10-2002 18:29:04  
A little gasoline engine, (a V-4, I think), used on diesel 2-cylinders, like a 720, to crank over the main engine for starting. Some say they're more trouble than they're worth. Never had experience with one. The only 2-cylinder diesel I've ever been acquainted with was an electric-start 730. I wish I'd had the money to buy it when the owner sold out, but I was in college . . . .

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