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Farmall & IHC Tractors Discussion Forum
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Hard Cranking H

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JSB

03-23-2005 10:08:45




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I have just completed an in-frame rebuild on my H and can barely turn in over with the hand crank, everything is torqued to spec. Is this normal?
Thanks




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captaink

03-24-2005 09:31:44




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 Re: Hard Cranking H in reply to JSB, 03-23-2005 10:08:45  
No, this is not normal, you should be able to turn the engine over with the crank but it should take some more effort than an engine that has many hours on it. Others have given you possible causes for the tightness; I suggest you check it out until you find it. I didn’t once and lived to regret it…



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captaink

03-24-2005 09:31:43




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 Re: Hard Cranking H in reply to JSB, 03-23-2005 10:08:45  
No, this is not normal, you should be able to turn the engine over with the crank but it should take some more effort than an engine that has many hours on it. Others have given you possible causes for the tightness; I suggest you check it out until you find it. I didn’t once and lived to regret it…



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Andy Martin

03-23-2005 16:28:46




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 Re: Hard Cranking H in reply to JSB, 03-23-2005 10:08:45  
If you are new to engine rebuilding, make sure you got the rod caps and main caps on the right bearings.



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riverbend

03-23-2005 15:30:51




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 Re: Hard Cranking H in reply to JSB, 03-23-2005 10:08:45  
When I put the motor for my H back together, I had a little trouble getting the crank to turn freely. If the main journal caps are the least bit cocked, they will bind up the crank. Same with the rods. Worst case? You will ruin a bearing and then the motor.

If you did not use plastigauge, get some at your local NAPA. You will need .002"-.003" and .003"-.004". It is a buck or two per stick. If you are careful one stick will do the entire engine. You have to check the clearence in the rod and main bearing journals.

Take the pan off and check the clearence. Do the mains first. You should have 0.002-0.003". Make sure the crank turns freely with the caps tight, but without the rod caps installed. Then do the rods one at a time to make sure they are not binding. They should have 0.002-0.003" also. Make sure that all the caps are in the right order and facing the correct direction.

If you run into trouble, post back. You can get a service manual on this website, at an IH dealer, or (my favorite), Binder Books.

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Ron in Nebr

03-23-2005 11:24:19




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 Re: Hard Cranking H in reply to JSB, 03-23-2005 10:08:45  
Did you put new pistons in or re-ring the old ones? Lots of times, if the old pistons are reused, an engine can be tight if the ring grooves aren't properly cleaned. Same deal if the ring gap isn't large enough. Most likely it's a tight bearing like the other posts say, but the rings will do it too.



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the tractor vet

03-23-2005 10:24:19




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 Re: Hard Cranking H in reply to JSB, 03-23-2005 10:08:45  
Did ya plasta gauge the bearings ???? How did it turn over with just the crank in???? and after ya started to install the pistons and rods??? New engines will have more drag then a wore out one but it should turn over .



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JSB

03-23-2005 11:26:40




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 Re: Hard Cranking H in reply to the tractor vet, 03-23-2005 10:24:19  
Yes, hard to turn @ full assembly
Plastigauge? Have heard of one but never used one



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Tip

03-23-2005 11:39:03




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 Re: Hard Cranking H in reply to JSB, 03-23-2005 11:26:40  
FYI, plastigauge is plastic that looks about like a human hair. It comes in different sizes depending on the tolerances you are checking. To use, you lay it across the bearing or surface you are checking, torque to spec and then remove cap. etc. The plastic will have been "squashed" ( technical term) and you check the widest point against the chart that comes with the plastigauge. The more squashed, the tighter the tolerance.

I am glad I am not a technical writer - I'd be hungry!

Tip

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Andy Martin

03-23-2005 10:47:54




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 Re: Hard Cranking H in reply to the tractor vet, 03-23-2005 10:24:19  
I think he means it is hard to turn fully assembled, by using the hand crank.

Plastigage the bearings and look for a tight thrust bearing.



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