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John Deere H cylinder bore

O

Otis

Member
I am rebuilding a 1943 John Deere H and have two blocks. One block has cylinder bores of 3.566-3.568 and the second block has bores of 3.574-3.578. The spec for a JD H is 3.562-3.563. What are the tolerances on the cylinder bore for a John Deere H before having to rebore and are both these blocks usable?
Thanks. Otis
 
one is .006" and the other is .016" I think the .006" one would work fine for an old slow tractor not being worked hard, but the other one is really getting worn out.
 
Thanks Mike---I will use the .006. If I want to use the .016 in the future I assume I can bore to .030 over and get pistons that are .030 over---correct?
Otis
 
I had mine rebored and got pistons from JD but that was a long time ago. May be NLA now. Have you check the bores in both directions and at three levels for out-of-round and taper?
 
When I rebuilt my 42 H years ago, it had .090 pistons in it.
I use it to cultivate the garden in summer and I am sure it will outlast me.
I would use the smaller bore and not worry about it.
Richard
 
Thanks Mark---I have found overbore pistons on line of .030, .060, and .090. I have not seen .045 but will keep looking.

Otis
 
Thanks Richard---I plan to use the .006 for this rebuild but will use the other block on another H I have. I found .090 pistons on line.
Otis
 
Thanks Mike--I have measured at various points in each bore and they look to be quite good with respect to taper and "roundness". Otis.
 
I'm not speaking of John Deere H pistons, but pistons IN GENERAL. Whenever you find an oversized piston, always verify that the overesized rings are available for it.
Quite often I've seen guys crow about finding a set of oversized pistons for an application and then finding out that rings are not available or high-dollar specialty rings have to be made at a very high price.
 
The bore taper and round are important.

But more important is the piston skirt clearance.

I would use the set closest to tolerance, whatever the tolerance is.

Also look closely at the ring lands. If worn oversize and unable to support the rings squarely in the bore, the rings will be short lived.

Be sure to check the ring end gap. Typically .004 per inch diameter.

Of course, a lot depends on the intended use. If a working tractor, it needs to be right. If a show/trailer/parade tractor, you can get by with more. The old engines were forgiving.
 
I have checked the clearance per the test listed in the Lindeman archives and am in spec---.003-.0055in. I will also make sure to adjust the ring gap to the H spec. This will be a "parade" tractor". Thanks for your input.
Otis
 
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