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F-I-T AND CLOONEY

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Rich

04-16-2003 06:47:58




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I started on the adjustments for the pony motor on the 70D. The crankshaft end play is okay. When the pony is running I can easily hold the pinion from turning with a screwdriver. I adjusted the yoke in 1 turn and it seemed to help slow the pinion. The new problem came in as the pony was idling. The pony began to overheat, I checked the upper water pipe from the pony and it was cold, the lower pipe going to the water pump was warm. I shut it down right away. I hope no damage was done. Now I need to address this problem. This pony was rebuilt by an old John Deere 2-cylinder mechanic before I bought the tractor. I have never noticed it oveheating before but have probably never run it this long. The coolant has been drained and replaced and the radiator is full.

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Clooney

04-16-2003 07:07:46




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 Re: F-I-T AND CLOONEY in reply to Rich, 04-16-2003 06:47:58  
Rich, you said "When the pony is running I can easily hold the pinion from turning with a screwdriver" does that mean it was turning UNTIL YOU HELD IT with a screwdriver? If so your pinion brake isn't functioning. That pinion shouldn't turn when it's sitting against the brake disk.
~On the hot bottom pipe & cold upper: maybe the pony thermostat hasn't opened yet to let the hot water out the top, or the water pump is not working. How long did you run the pony? How hot did the lower pipe get? It might not hurt to remove the thermostat, then place a string in the valve, then hang it in a pot of water with a thermometer in the pot [keep the thermometer off the metal pan], then place the pot on the stove, then see what temperature the T-Stat drops off the string when it opens.

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Rich

04-16-2003 07:50:35




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 Re: Re: F-I-T AND CLOONEY in reply to Clooney, 04-16-2003 07:07:46  
Yes, it appears as though the brake isn't functioning. I didn't get to work on this very long as the pony overheated. I did notice when I held the pinion and increased the pony speed slightly I saw a small amount of smoke come from inside which smelled like a hot clutch. At this point I noticed the overheat problem and had to stop.

The pony had been running about ten minutes, but had been started and run before for short one or two minute periods. The lower water pipe was just warm. The intake manifold on the pony got very hot, I noticed it because of the hot paint smell.

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F-I-T

04-16-2003 08:41:52




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 Re: Re: Re: F-I-T AND CLOONEY in reply to Rich, 04-16-2003 07:50:35  
Rich:

If this is the first time you have run the pony for an extended interval, it well could get the manifold pretty hot. Those exhaust passages are running in the mainfols, too, and it can hot enough to boil off wash water that settles into the bolt depressions. It will certainly smell a bit from any extraneous oil on or grease on the manifold or exhaust pipe, too.

You're '70' must be after 7034100 to have a thermostat. How hot are the pipes on that ? The thermostat is only around 100*-115* so it should open pretty early in the run.

If that brake isn't working, you're going to have problems getting the pinion to sit still. They're available from Deere, but a pain to install.

Frank

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Rich

04-16-2003 12:32:02




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 Re: Re: Re: Re: F-I-T AND CLOONEY in reply to F-I-T, 04-16-2003 08:41:52  
It was hot enough that the paint was starting to bubble. The serial number is 7030768 so it would not have the thermostat. Maybe I was just too cautious but being that warm I thought the pipes should be warm and if I understand correctly the water comes comes from the side of the block, through the pump and out the upper pipe. The lower one was warm and the upper one cold.



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F-I-T

04-17-2003 06:16:48




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 Re: Re: Re: Re: Re: F-I-T AND CLOONEY in reply to Rich, 04-16-2003 12:32:02  
Rich:

I've been thinking about this. Where on the manifold was the paint starting to bubble. If it was that hot near the distributor end, that's hot ! If it was on the exhaust output (trannmission) end, that might be normal. I'll start mine this morning anf monitor what pipes get warm first. I'm not certain which direction the coolant flows. Things can be a backward in those pony designs.

Frank

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