JD Two Cylinder Head Question

Tractormantwo · Mar 17, 2010

I have a reconditioned JD two cylinder head im trying to determine what it fits. I figured it fit an M, MT, 40 but I compared pictures it doesnt seem to match up exactly. The number on the head is A21356. I looked at pictures of the 420 and 430 as well and it seem to look a little bit different. Please help. Thanks!

Patsdeere · Mar 17, 2010

I would try the deere forum. You will probably get a faster response there.

Tractormantwo · Mar 17, 2010

Thanks!

Old Roy · Mar 17, 2010

judging by the color and if I can see the stampings correctly I'm guessing Wisconsin 4 cylinder ( 1 ) stamped on right and( 4 } on left side

Ole Shovel · Mar 17, 2010

Not JD. A21356 & A21357 are heads for Case 930 with 371 gasoline or LPG engine.

Tractormantwo · Mar 17, 2010

Thanks!! Well I just thought it was JD.

BlaineF · Mar 17, 2010

It kinda looks like a Case tractor head to me .My head casting manual does not show this casting #.It shows A21357 case 251 inline 4 cylinder.I know thats not the exact number ,but the cast number A21356 should be above it and its not.Just using it for a referance.All the head cast# I can see for John Deere have a letter at begining and end of number.(A2325R) So I guess I'm no help to you.Thought this big manual would contain the answer.BlaineF

Ole Shovel · Mar 17, 2010

730 also ?
A21356 Case Head

Tractormantwo · Mar 17, 2010

Thanks!! This head appears to be a verticle 2 cylinder to me.

RN · Mar 18, 2010

Case and some other engine makers used multiple 2 cylinder head assemblies- Moline also had some I think. 2 of them for a 4 cylinder 3 for a 6 cilinder. Blocks were multiples of 2 also, spacing between blocks seperate from crankcase allowed mainbearings clearance. Crankcase one casting, blocks another casting, heads another casting. This meant use of smaller molds practical. Machining of certain parts- as drilling oil passages in crankcase easier. Parts replacement also easier at times- a freezed cracked cylinder block assembly on a big 6 meant only 2 cylinders worth needed replacing instead of new base block with case and all cylinders- think of old VW beetle flat 4 type 1 and 2 engines compared to a VW Rabbit. Weight total would be higher- but servicability would be greater in field or shop outside factory.

Ole Shovel · Mar 18, 2010

Case 730 is 4 cylinder uses 2 of these heads, Case 930 is 6 cylinder so uses 3 of these heads.

JD Two Cylinder Head Question

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