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| John Deere Tractors Discussion Forum |
Topic: 1928 D spark plug hole thread size and plug #?
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| Canadian Ken
03-17-2013 20:49:00
74.114.76.84
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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 advanceKen
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| gtx1967jewison
03-18-2013 18:08:52
174.225.129.83
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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
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| 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
64.235.98.126
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Re: 1928 D spark plug hole thread size and plug #? in reply to gtx1967jewison, 03-18-2013 18:08:52
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| | 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
71.54.160.151
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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
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| | 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
69.68.38.204
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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
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| 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
71.54.160.151
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Re: 1928 D spark plug hole thread size and plug #? in reply to LarrySTN, 03-18-2013 05:35:53
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| | 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
69.68.38.204
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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
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| Your D should have 1/2 inch pipe thread for the spark plugs.
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