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D7 Pony Engine chuffing out the crank start opening

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3 months 1 week ago #258665 by TOP

The housing needs to be removed from the engine. From memory, there's a plug in the bottom that you can take out to push the shaft out of the gear and the housing.o
 

Yes, I suppose it makes sense. The seal would never pass over the two pins on the shaft in order to get it out the front.

D7 17A '56

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3 months 1 week ago #258666 by D8Dude
It may be possible to replace the seal without removing from the engine, the drive pin for the crank can be removed through a slot opening in the base.

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3 months 1 week ago #258667 by TOP

There is a seal in there, it's fairly easy to replace, it was still available through Cat when I replaced mine a few years ago.
 
Do I have to take the whole housing off the side of the engine or can it be replaced with the housing in place?My parts book only shows the vertical crank mechanism.
 

Do you by any chance know the part number for the side crank right angle drive seal?

D7 17A '56

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3 months 1 week ago #258668 by D8Dude
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3 months 1 week ago - 3 months 1 week ago #258669 by D8Dude
I believe your side crank has just been installed sideways, in your other thread it looked to be the same as the vertical drive, just installed a quarter turn around on the bolt pattern.

The seal number would be 2B0050
Last edit: 3 months 1 week ago by D8Dude. Reason: Added text

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3 months 1 week ago #258673 by TOP


 

That's what the parts book says is there. But that's not actually what is there. We had a discussion in another thread about identification of the pony engine. But in my case the pony engine has a side crank where the crank has to operate between the track and the frame. So feeling there is a little bit more problematic since that's a high dust area and what comes out can go in which is not good.

There is a possibility which I am not sure of that they may have modified the pony engine because they installed an auxiliary hydraulic system and the tank for the hydraulic system interfered with a vertical crank on the pony engine. So they cut off the mounting for the vertical crank and all I can say is that there is a horizontal crank in the pony engine now. So one of the problems I have is I don't know the part number for the seal on that particular method of cranking the pony engine

D7 17A '56

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3 months 1 week ago #258674 by TOP

I believe your side crank has just been installed sideways, in your other thread it looked to be the same as the vertical drive, just installed a quarter turn around on the bolt pattern.

The seal number would be 2B0050
 

That could very well be the case. That would answer a question I had on another thread about identification of the pony engine because it didn't seem like anything in the parts matched what was actually installed on the tractor. But if that can be rotated that would very likely be the reason why the engine is configured a little differently.

In the interest of locking off that potential path for ingress of dirt prior to being able to change the seal I am thinking that finding either a plastic bottle or a metal fan and ceiling and clamping it over that opening would be an expedient way to stop the chuffing and block the entry of dirt and water into the engine through that route. I don't know what you guys think about that but I think it's a possibility. But I always like to fix things properly so when the opportunity presents itself I'll probably tear into that and find the seal and install it. This is been a very helpful little thread for me.

D7 17A '56

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3 months 1 week ago #258675 by neil
It would be a good temporary workaround TOP. For the seal, a couple of options - there's a limited range of crank housings that it could be. If you can find a casting number on the pony, someone may be able to cross-reference that to a model, and from there to options on the crank housing, and then from there to the potential seals. Another way would be to disassemble it and measure the seal and buy a generic one to fit.

Cheers,
Neil

Pittsford, NY

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3 months 1 week ago #258677 by D8Dude
TOP,
Based on the limited pictures I've seen in the thread on identifying your starting engine, I'm fairly confident that your right angle hand crank adaptor is the same as the one in the parts manual, it's just not installed in it's original position, and obviously missing the shaft that would connect with it and extend up through the bonnet. A couple of pictures of it from another angle could help to confirm this.

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3 months 1 week ago - 3 months 1 week ago #258683 by gauntjoh
Some 7M tractors (including my own) are side start where the hand crank goes in through the side rather than down through the bonnet.
 

The parts book says the seal is a 2B50

John Gaunt, ACMOC Director, UK
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Last edit: 3 months 1 week ago by gauntjoh.

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