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D17 Series II spark plug confirmation
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EPALLIS View Drop Down
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Joined: 12 Sep 2009
Location: Illinois
Points: 1137 		Post Options Post Options   Thanks (0) Thanks(0)   Quote EPALLIS Quote  Post ReplyReply Direct Link To This Post Topic: D17 Series II spark plug confirmation
    Posted: 21 Apr 2024 at 9:09pm
Hi:  Just need a confirmation that I'm treating this 60-year-old A-C girl correctly.  On a D17 Series II, the original owner's manual says to use AC Delco 45XL spark plugs.  I understand these are no longer made.  I then went to the cross-reference conversion chart, and it said today that I should be using Autolight 405 in the Allis Chalmers D17 Series II.  Does that sound correct?  Thanks in advance for any assistance.  Appreciate it!
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DrAllis View Drop Down
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Joined: 12 Sep 2009
Points: 20567 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 21 Apr 2024 at 9:45pm
R-45 XL or R-45 XLS
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Joined: 11 Sep 2009
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Points: 339 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Don Jr NY Quote  Post ReplyReply Direct Link To This Post Posted: 22 Apr 2024 at 4:40am
Our "unofficial" series II is a 1961 and uses the long reach plugs. Ours has Champion RN11YC in it. I thought only the series I used the short reach plugs like the AC 45's but I'm not sure of the serial number break between the two.  Don Jr.
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Points: 20567 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 22 Apr 2024 at 6:17am
I believe the chassis s/n was 24001 and up had the long reach spark plugs. One has to be careful because over the years engines and cylinder heads have been swapped out. The newer cylinder head always has a casting plug on the front and rear of the cylinder head face that takes a 7/16" wrench to install/remove it. The older short plug heads are smooth with no core casting plugs located there.
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Joined: 12 Sep 2009
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Points: 1137 		Post Options Post Options   Thanks (0) Thanks(0)   Quote EPALLIS Quote  Post ReplyReply Direct Link To This Post Posted: 22 Apr 2024 at 9:01pm
Got it.  Thanks Doc.  My serial number is #36121.  If you have time I'm curious to what the "S" stands for in the 45XLS?  Thanks again!
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Points: 20567 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 22 Apr 2024 at 10:11pm
The electrode is a little deeper into the combustion chamber.
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SteveM C/IL View Drop Down
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Joined: 12 Sep 2009
Location: Shelbyville IL
Points: 8247 		Post Options Post Options   Thanks (0) Thanks(0)   Quote SteveM C/IL Quote  Post ReplyReply Direct Link To This Post Posted: 22 Apr 2024 at 10:13pm
Isn't it "extended tip" ? The porcelin and electrode stick out more than regular plugs.
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