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John Deere Tractors Discussion Forum

John Deere D 6.5 inch bore head gasket?

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Canadian Ken

06-02-2011 19:42:07

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My friend has a 1927 John Deere D -he ordered D1787R head gasket from Deere which fits my 1928 6.75 inch bore D perfectly. The gasket fits the outside of the block fine, but there is not much gasket around the cylinder/ fire ring - the gasket also blocks off some of the water jacket. Has anyone used this gasket on the 6.5 inch bore D, and have you had good luck with it afterwards? Does anyone know where to purchase the correct gasket? Kevin Stober - Farm Power Restoration has a head gasket listed for D tractors which is the same number as Deere sells.
Thanks in advance

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06-02-2011 19:51:07

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 Re: John Deere D 6.5 inch bore head gasket? in reply to Canadian Ken, 06-02-2011 19:42:07  
Only one head gasket available for the D fits 1923-1953. I suppose at one time there may have been a smaller gasket for the early tractor , but I would bet it hasn't been made since before 1935. no real reason for smaller diameter fire ring . the heads are the same 1924-1930.Paul

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Canadian Ken

06-02-2011 19:57:09

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 Re: John Deere D 6.5 inch bore head gasket? in reply to skip33652, 06-02-2011 19:51:07  
I agree that the head is the same, except the block is different which causes the head gasket to sit in the wrong location on the block mating surface.

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06-02-2011 20:55:53

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 Re: John Deere D 6.5 inch bore head gasket? in reply to Canadian Ken, 06-02-2011 19:57:09  
the only difference is the bore size. there may be core shift where the block or head is shifted to one side or other.On my spoker the head kind of sits off to the side like all the bolt holes were drilled an 1/8 th of an inch to one side . but that d1787 gasket is the only D gasket there is unless you make one from copper.Paul

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