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John Deere '38 B

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Allen Heilner

09-20-2000 03:05:05

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I have questions concerning the block on my 38. It has a weld on the inside of the cylinder at the top where ther is no piston travel. I went to use a block off a '37 I have and this blosk appeared to have a sleeve of some sort that slid into the top of the cylinder, only about 1 inch down. Any help would be appreciated. What is the sleeve for? Is it common to see block repairs on the inside of the cylinder?
Thanks,
Allen Heilner

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steve

09-20-2000 18:59:38

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Re: John Deere '38 B in reply to Allen Heilner, 09-20-2000 03:05:05

you didn't say if the cly. bore is bigger where the piston runs. the description of the good block almost sounds like a power block.they were built so you have to take the pistons out of the bottom of the block

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Allen

09-21-2000 03:06:21

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Re: Re: John Deere '38 B in reply to steve , 09-20-2000 18:59:38

I didn't measure the bore of the block with the inserts. I'll check that. That of course would require changing pistons also. This has been a good learning experience. There is something to be said for buying a tractor in running condition. Thanks to everyone for your help!!
Allen

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DPOST

09-20-2000 09:36:16

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Re: John Deere '38 B in reply to Allen Heilner, 09-20-2000 03:05:05

Could you give a better description of this sleve that is in the 37 B block. What is its indide diameter? Is there one in each cylider?

My if the inner diameter is considerably smaller than the bore, my guess is it is an insert to increase the compression ratio of the engine.

Many of these all fule tractors were modifed to use only gasoline by installing a cold manifold and increasing the compression ratio from stock 4.5:1 to around 6.5:1 or 7:1. Doing this gave about a 20 to 30 percent horse power increase. There were several methods of increasing compression, 1.) add an insert to take up the extra space, 2.) install longer or high compression pistons usually made of aluminum, or 3.) install a special head that protruded further down into the cylinder space.

If you have a block or head and have any doubt about its quality, take it to a shop that rebuilds heads and blocks and have it presure tested. It will cost about $40.00 to presure test, and in my opinion well worth the money.

Take care D.D.Post

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Allen

09-20-2000 14:55:05

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Re: Re: John Deere '38 B in reply to DPOST, 09-20-2000 09:36:16

Exactly what I thought. It is configured around the top to receive the valves, contoured around the plug and does not touch the cylinder wall where the piston rides.I did not see them in my '35 nor does the parts manual list anything. I feel these inserts are not necessary and are an aftermarket product. They appaear only to occupy volume.

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alan

09-20-2000 04:02:31

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Re: John Deere '38 B in reply to Allen Heilner, 09-20-2000 03:05:05

Sounds like at one time it was cracked and they sleved it

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Wayne Swenson

09-20-2000 22:33:17

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Re: Re: John Deere '38 B in reply to alan, 09-20-2000 04:02:31

That is how you gain compression ratio. I would leave them in for better performance.

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