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Allis Chalmers Discussion Forum

PTO - Turn Engine?

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Author  [Modern View]

01-15-2017 20:03:14

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Question - can I turn the engine with the PTO - with the PTO engaged and tractor out of gear?

I have a situation with an Allis C - 1941 that has a stuck engine .. (I have had a number of engines that were stuck and all came "unstuck" after lots of Marvel Mystery Oil - BP Blaster and Diesel fuel .. on the cylinders) ..

But this one is a tough one .. I haven't worked on it much .. I have had them set for 3 months - and seem futile - and by working it a little at a time . ... finally come loose and NOT smoke !!! and run fine . . (except one engine smoked on an 8N Ford) ...

My situation is I can't really get a good grip from the front .. here is my question

Why can't I put the transmission in NUETRAL and put the PTO on ... and turn the PTO to turn the engine?

Will this work or is there something I am missing .. ?
Thanks so much .. Gary

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01-16-2017 15:45:52

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 Re: PTO - Turn Engine? in reply to gdtractor, 01-15-2017 20:03:14  
Take the exaust manifold off inspect then the head and the oil pan off and inspect.. You'll know how to proceed.

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01-17-2017 01:51:35

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 Re: PTO - Turn Engine? in reply to Raptor44, 01-16-2017 15:45:52  
Thx much

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Traditional Farmer

01-16-2017 05:33:31

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 Re: PTO - Turn Engine? in reply to gdtractor, 01-15-2017 20:03:14  
Good way to break something in the drive line.I'm a firm believer in pulling the head on a stuck engine to see what the original problem was before trying to get it loose and many times even if you get the engine freed up the head still has to come off.Takes only a few minutes to pull one of those heads.

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01-16-2017 07:50:10

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 Re: PTO - Turn Engine? in reply to Traditional Farmer, 01-16-2017 05:33:31  
Thanks much .. I think I will go the route of soaking .... and pulling the head ..

thanks so much . no sense ruining a good engine ... being impatient !


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01-16-2017 08:57:02

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 Re: PTO - Turn Engine? in reply to gdtractor, 01-16-2017 07:50:10  
On all the engines I have freed up I used the starter to free them up. The starter was made to spin the engine in the first place and the only thing IO have even had get hurt by doing that is a push rod and even then I have only had that happen once in over 30 engines that I freed up

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Bob Bancroft

01-16-2017 05:03:00

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 Re: PTO - Turn Engine? in reply to gdtractor, 01-15-2017 20:03:14  
The gearing puts the PTO at such a disadvantage of trying to turn the engine, that with a stuck engine, I don't think it will work. Might have a little better luck with the belt pulley. But employing a lot of leverage might break something. I think removing the pan and leveraging the crankshaft is the way to do it. It's a good idea to have a look inside the pan on a stuck engine anyhow.

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Dick L

01-16-2017 07:30:43

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 Re: PTO - Turn Engine? in reply to Bob Bancroft, 01-16-2017 05:03:00  
I agree with Bob and T farmer. What is not considered when comparing the B's and C's with stuck engines of other brands is that the under hood muffler they were designed with kept the rain water from running into the manifold then getting over the pistons. When the above hood mufflers went into the manifold as the under hood muffler which does not seal out the water. Because of that this is what you will normally find when the tractor has not been inside 24/7 for its life.

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01-16-2017 06:12:42

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 Re: PTO - Turn Engine? in reply to Bob Bancroft, 01-16-2017 05:03:00  
Agreed, the pto runs at 540 and the engine somewhere around 1500rpm. A 3 to 1 reduction more or less. Going the other way a 3 to 1 stepup, 1/3 the torque applied to the pto is applied to the engine.

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Lonnie Smith

01-15-2017 20:17:51

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 Re: PTO - Turn Engine? in reply to gdtractor, 01-15-2017 20:03:14  
As long as the clutch is engaged it should work just like you want. Push the clutch in and you break the connection.

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01-15-2017 20:41:13

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 Re: PTO - Turn Engine? in reply to Lonnie Smith, 01-15-2017 20:17:51  
Thanks much ..

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