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unstyled is really tight

P

Patsdeere

Well-known Member
So I am still helping an old friend out with his unstyled a. Tried turning it over a week ago and it was tight (so hard that after spinning it for about 30 minutes I was sore the next day), but figured it was because of new rings. It was mentioned to check the rods to make sure they were too tight on the crank. So he loosened them up excessively and the thing will barely turn over. I really don't want to pull the head, but if I have to I will. Any ideas on what might be the problem or where to look?

I thought we had checked ring gap, but he says we didn't. Could that be causing us this much trouble?

Thanks.
 
I just put rings in a B and you cant hardly turn the crank and my rods and mains are loose,So if you can spin yours for 30 minutes your a good man

jimmy
 
Was it just new rings, or did this involve a bore job and new pistons? Did the rings come from Deere or aftermarket? Was the crank removed? new bearings?

If oversized rings were put in by mistake instead of standard you would have a problem.

You mentioned that he loosened up the the rods, but how "bout the mains? You could take the rods loose and see if the crank will turn easy.

If dirt or grit got in the bearings it will be real hard to turn.

I would also check the end play on the crank. Maybe the flywheel is set too tight.

The only other things I could think of would be a problem with one of the cam bearings, governor or the oil pump.

Kurt
 
Try squirting some motor oil in the spark plug holes. You need some top end lubricant. If you were cranking it and choking it to start the gas will wash down the lubrication from the cylinder walls.
 
Kirt, thanks for some ideas- responses to your thoughts.


Block was replaced, it had been sleeved and bored back to std.

Rings, I don't remember where they came from, but I think aftermarket.

The mains and crank were never removed.

I hadn't thought about the flywheel being too tight, but I will check that.

It ran before it was torn down, and nothing was done with the oil pump (since it had good pressure before) or the cam or govenor.
 
The cast block lets oil seep in to it, after maching work it has been removed . You need to pull the plug wires and as said squirt some motor oil in the spark plug holes than either belt it up or pull it for at least a hour . You need to give the cylinder's time to soak up some oil .
 
My experience with the rings from Deere is that they are bang on the money. If the sleeve and bore job was to the correct dimensions, and you are using the old standard pistons, then that only leaves the rings, or the rods are set up too tight.

I would not discount that the machine shop may have made a mistake either.

It really should not be too hard to turn. I recently redid the engine on my unstyled B, also a sleeve job back to standard, used the old pistons with new rings from Deere.

Turned easy from the first start.

Kurt
 
Pat, some good info here. I agree on belting it up with another tractor for 30 minutes or so. Also, when you running it, always check for oil oressure, when done, feel all the areas of the engine for heat, such as mains, governor, ect. If still tight, might take engine top cover off and feel the rod bearing area. Jerry
 

You say it's hard to turn over. Can you explain that further?

If you pull the spark plugs out, is it still hard to turn over?

I'm more concerned that you spent 30 minutes cranking and it didn't start.

Did you put new pistons in it? If you used the old ones, did you clean out the ring grooves?

Did you check the ring end gap?
 
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