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Case Tractors Discussion Forum

Case engine building question

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Billy Vermpf

08-29-2006 14:07:58

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Im in need of some advice on a project im working on. I have a 51 LA that has the 4 7/8 bore flush pistions in it. My problem is it smoked so im reringing it and naturaly it is pretty loose. The new rings have helped but i can still move the pistons around a little more than i want at TDC. I wouldnt worry about it a bit if i was putting on a low compression head. I have a 6386 LP head i want to put on it. My question is what is all the extra compression going to do to me. I have a freind who has this set up in a L and its a pull start only. So i know it makes alot of compression and power. thanks

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C. Amick

09-01-2006 09:19:44

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 Re: Case engine building question in reply to Billy Vermpf, 08-29-2006 14:07:58  
I could be wrong, but I think the rings are supposed to have a .020" end gap for expansion. A measurement of how much you have at TDC might be a good indicator of how badly the cylinder is worn. Are they aluminum pistons? Did you check the ring grooves for wear?

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Walt Davies

08-30-2006 16:31:22

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 Re: Case engine building question in reply to Billy Vermpf, 08-29-2006 14:07:58  
If there is no lip at the top of the cylinder then your bore is stock and the pistons should be correct for that. A big bore engine has alot of piston clearance. I have heard of putting Bon Ami in the bore to seat the rings haven't tried that so can't say if its safe or not but sounds like it would work.

On my 45 LA I have the high compression LP pistons and head and I had to go to 12 volt battery to turn it over.

I can still hand crank it though but I'm strong for my age (68) I like to get young men to try to crank start it you would be suprised how many can't.

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