Not Ford - IH has me stumped! (Fairly long)

Lynn Patrick · Jun 27, 2017

First some background. I'll be 74 in 2 weeks & have been overhauling my own since I was 15 & have maintained (including complete overhauls) a fleet of trucks (Ford & IH) at a previous job. All this to say I am not a newcomer to wrenches!
I have my IH Cub LoBoy 154 (IH C60 engine) torn down, have replaced rings, bearings, etc.. At each step I turned the engine w/a wrench. When I had it all together it would not turn even when pulled.
Tore it down again, checked the mains, retorqued them, turned it (wrench) mounted it, & it won't turn over.
Pulled it out again, checked the mains w/a mic, replaced the one that was giving me the most trouble w/the old one. I can now turn it (wrench) but the starter won't turn it. Tried pulling it again - just skids the tires.
What am I missing? & where do I go next? (Actually I am going to the grandkids for a few days & will let it stew!)
Any suggestions???
Thanks!

old · Jun 27, 2017

Well since you did not say you did but you should be but I'll ask any how you are using some type of lube on the bears are you not?? Or maybe if you had the crank checked and turn they gave to the wrong bearings or you have the main caps mixed up

Lynn Patrick · Jun 27, 2017

Used lube, bearings are marked right, caps as they came off.
Thanks!

Curt Cooke · Jun 27, 2017

so the motor turns until you mount it on the tractor? If that's the case, perhaps your problem is behind the motor, like the transmission in 2 gears at the same time. That condition will mimic a seizure. What
about bolt lengths in the flywheel? Will the tractor tow until you let out the clutch?

WayneIA · Jun 27, 2017

Wandering if I follow your sequence right? You seam to be blaming a main bearing! Wander why you didn't pick up on that before you installed the pistons?. Sure you don't have a bent rod?

sunbeam · Jun 27, 2017

Can you pull the tractor with the clutch disengaged?

Larry NCKS · Jun 28, 2017

(quoted from post at 22:56:52 06/27/17) Can you pull the tractor with the clutch disengaged?

Aha! There's the question I want the answer to. Another way to say it is, did the engine roll with a wrench once it was totally assembled but not yet installed on the transmission?

Lynn Patrick · Jun 28, 2017

Thanks for the replies. I'll try to answer each one:
Curt - Tranny works as it should, flywheel bolts not a problem, tractor rolls when in neutral.
Wayne - Rods all good, engine will turn freely until torqueing mains, especially the center one.
Sunbeam - tractor rolls easily.
Larry - engine turns w/wrench & will move tractor when in gear.
There is a driveshaft between the engine & tranny that is driven by a shear pin in a yoke, so there are no flywheel bolts that can catch on anything & tranny is easily disconnected - but engine still will only turn w/wrench.
Still looking!

Curt Cooke · Jun 28, 2017

When the crank is installed and nothing else, when all mains are torqued down, it should spin freely and smoothly. If that's not the case, I would have a machine shop check the crank bore for alignment and of course, plastiguage the bearings when torquing the mains. Should be smooth as glass. Did you have the rods reconditioned? Relating one experience, rebuilding Farmall A engine, did not have the rods checked for round. Experienced the same thing you relate. Had rods reconditioned, they were way out of round.

Keep us posted!
Curt

sotxbill · Jun 28, 2017

Bent crankshaft, or damaged main cap, switched main caps, or wrong size main bearings.

I have had it happen on the wrong sized main bearings. they were marked "standard" and were 10 over one time and had the pistons resized or knurled too big one time.

Not Ford - IH has me stumped! (Fairly long)

Lynn Patrick

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old

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Lynn Patrick

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Curt Cooke

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WayneIA

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sunbeam

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Larry NCKS

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Lynn Patrick

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Curt Cooke

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sotxbill

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