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JD A

Basic Questions

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Bob

06-20-2002 05:48:50

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Hope someone can answer a few very basic questions for me.

1. How do I measure wrist pin clearance? The pins feel snug, but I'd like to know for sure.

2. The block that was on the tractor was a powerblock with a chunk broken out of the cyl at the back on one side (is that a sleeve on a powerblock or part of the block itself like on a normal A?) Anyway, I'm replacing it with a stock block of another A. On the stock block, one of the studs is missing a chunk on one side for the whole length of the threads. Should I try to remove the defective stud and risk snapping it off and hating myself for the remainder of my life, or should I put the thing together as-is and risk discovering that I can't torque the head down to specs? If I should pull the bad stud, what's the best way to do it?

Thanks in advance for any advice. Obviously I don't know what I'm doing, and can use any advice I can get!

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SEAMO

06-20-2002 19:11:07

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Re: JD A - Basic Questions in reply to Bob, 06-20-2002 05:48:50

Bob, the sleeves in a power block can be replaced. Don't throw the block away some tractor pullers can run that block.They even make them bigger bore. Earl

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Tractorboy

06-20-2002 16:20:16

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Re: JD A - Basic Questions in reply to Bob, 06-20-2002 05:48:50

Bob,I always heat the stud real good and let it cool all the way by itself and then warm up the block around the stud and they always usually come out pretty easy . The stud can be made from alloy by a good machinist with no prob or you can take one out of the other block. Good luck and post back to let us know how you come out now.

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Jerry S

06-20-2002 14:18:29

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Re: JD A - Basic Questions in reply to Bob, 06-20-2002 05:48:50

If it were my tractor and I was afraid of breaking the stud, I'd load up the block and head for a trusty machine shop where they would be able to do it with tools I wouldn't have access to. I am sure JD probably still has the studs but would get one and take it with me to the shop.

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MIKE

06-20-2002 12:53:24

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Re: JD A - Basic Questions in reply to Bob, 06-20-2002 05:48:50

If I read correctly it sounds like your stud is good and the block has a chunk out of it.If it has a chunk out find another block or a good welder to repair it but it still may crack again.

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Wind

06-20-2002 10:33:40

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Re: JD A - Basic Questions in reply to Bob, 06-20-2002 05:48:50

I really think that you need to replace the stud. Torque on that stud will be marginal at best and you want even torque over all the studs. Otherwise you will never get the head gasket to seal properly.

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1020Tom

06-20-2002 10:55:02

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Re: Re: JD A - Basic Questions in reply to Wind, 06-20-2002 10:33:40

1) Make sure you can still buy a stud before doing anything. If you can't buy one your decision is made for you.

2) Use lots of heat before trying to remove.

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