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Spark plugs
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Smiling John View Drop Down
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Joined: 27 Sep 2009
Location: NY
Points: 69 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Smiling John Quote  Post ReplyReply Direct Link To This Post Topic: Spark plugs
    Posted: 26 Jan 2024 at 12:48pm
I have a WD45 with a D17 head, Series 1 or 2. What spark plugs should I use?  Thanks.
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Brian G. NY View Drop Down
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Joined: 12 Sep 2009
Location: 12194
Points: 2241 		Post Options Post Options   Thanks (1) Thanks(1)   Quote Brian G. NY Quote  Post ReplyReply Direct Link To This Post Posted: 26 Jan 2024 at 2:12pm
From the manual:

The early D-17 engines use a 3/8" reach plug eg: A-C 45, Autolite A-7 or Champion J-8.

 Begining with "engine" Ser. #17-17293, a 3/4" reach plug was used eg: A-C 45XL,  Autolite AG-5 or Champion N-8.

I don't know if those plug numbers are still available but can probably be cross-referenced.

You may not know the engine number from which your head came.....in that case, I guess the depth could easily be measured. Or..... someone here may know the head casting numbers.
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DrAllis View Drop Down
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Joined: 12 Sep 2009
Points: 20478 		Post Options Post Options   Thanks (1) Thanks(1)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 26 Jan 2024 at 2:31pm
3/8" plug heads have smooth cylinder head castings front and back. 3/4" plug heads have a core plug in each end of the head.   Delco R45 plugs for 3/8" reach and R45 XL for 3/4" reach plugs. If the plugs currently used are 3/4" reach and they aren't SMASHED they are correct length.

Edited by DrAllis - 26 Jan 2024 at 2:32pm
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Lars(wi) View Drop Down
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Joined: 14 Sep 2009
Location: Permian Basin
Points: 7192 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Lars(wi) Quote  Post ReplyReply Direct Link To This Post Posted: 26 Jan 2024 at 2:39pm
Take a plug out, and see what you got.
I tried to follow the science, but it was not there. I then followed the money, and that’s where I found the science.
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Smiling John View Drop Down
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Joined: 27 Sep 2009
Location: NY
Points: 69 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Smiling John Quote  Post ReplyReply Direct Link To This Post Posted: 28 Jan 2024 at 3:09pm
Thanks. The plugs in it were in it are RN11YC4. Have no idea where I got them or why. Don't know if they have some unique feature.
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Ed (Ont) View Drop Down
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Joined: 08 Nov 2009
Location: New Lowell, Ont
Points: 1290 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Ed (Ont) Quote  Post ReplyReply Direct Link To This Post Posted: 28 Jan 2024 at 4:40pm
If they are in reasonably good shape just clean and reuse. Don't need anything fancy in those motors. Set the gap as well.
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