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John Deere Tractors Discussion Forum
Show Parts for Model:

1928 D spark plug hole thread size and plug #?

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Canadian Ken

03-17-2013 20:49:00




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What thread size is the spark plug holes in a 1928 D -serial #71371 - 6-3/4" bore block -mine are rusty, and I would like to run a tap through before installing the head
What spark plugs do guys use? I did have plugs in 2002 when I dismantled the tractor -they were two piece, but I cannot locate these now- I also moved the tractor from one shop to another since then -all other parts are still here.
Thanks in advance

Ken

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gtx1967jewison

03-18-2013 18:08:52




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 Re: 1928 D spark plug hole thread size and plug #? in reply to Canadian Ken, 03-17-2013 20:49:00  
REMEMBER pipe thread is tapered! Do not go more rhan a tiny scrape with a tap or it will be oversized & your block is damaged.



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Canadian Ken

03-19-2013 12:20:33




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 Re: 1928 D spark plug hole thread size and plug #? in reply to gtx1967jewison, 03-18-2013 18:08:52  
right -thanks -i think i will just use a round steel brush instead -it is just surface rust

ken



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John T

03-18-2013 05:15:51




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 Re: 1928 D spark plug hole thread size and plug #? in reply to Canadian Ken, 03-17-2013 20:49:00  
The original plug was a Champion 7 and 7/8 pipe threads as posted....You may find some on Flea bay or most tractor shows have antique plug vendors....

John T



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LarrySTN

03-18-2013 05:35:53




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 Re: 1928 D spark plug hole thread size and plug #? in reply to John T, 03-18-2013 05:15:51  
John T, the 7/8 plug you mention was used at serial number 109944 and after, which is a 7/8 14 plug. The plug he is looking for is 1/2 inch pipe thread (serial number 30400 - 109943) . That would be todays champion 25 or autolite 3695



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John T

03-18-2013 05:41:00




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 Re: 1928 D spark plug hole thread size and plug #? in reply to LarrySTN, 03-18-2013 05:35:53  
MY Bad, I had 1/2 written right in front of me but typed in 7/8 by habit grrrrrrrrrrrrrrrrrr

Thanks

JT



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LarrySTN

03-17-2013 22:17:27




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 Re: 1928 D spark plug hole thread size and plug #? in reply to Canadian Ken, 03-17-2013 20:49:00  
Your D should have 1/2 inch pipe thread for the spark plugs.



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