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Allis Chalmers Discussion Forum
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D17 series 1 plugs

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Luke470

01-18-2020 16:07:48




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I believe I've asked a similar question before. And based on the answer I bought Delco plugs.

Need new plugs and the parts store gave me autolite platinum AP25.

They said these crossed with the R45. Checking on the one website I know I can't find the R45/AP25 cross. Does anyone know if the AP25 will work in the series 1 D17 with 3/8" reach?

As always thanks.




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Luke470

01-19-2020 07:26:11




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 Re: D17 series 1 plugs in reply to Luke470, 01-18-2020 16:07:48  
Thanks very much. I really appreciate the replies! Not being able to find the AP 25 was making me think I couldn't read cross references. Glad to know that I can and aren't crazy!



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Jim.ME

01-19-2020 04:54:57




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 Re: D17 series 1 plugs in reply to Luke470, 01-18-2020 16:07:48  
They must have crossed one of the AC R45T (tapered seat) series plugs to get the AP25. Whatever they did, it is wrong as posted by VAClee.

From references I looked at, it looks like the AC Delco R45 (this is a resistor plug) crosses to an Autolite 306 or NGK 3522 BR6S.

The plain AC 45 crosses to an Autolite 295 or NGK 3210 B-4.
I have been using the NGK's in my CA and D14s with good results.

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old

01-18-2020 19:31:09




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 Re: D17 series 1 plugs in reply to Luke470, 01-18-2020 16:07:48  
If I remember right I put NGK3112 plugs in my D-17 and my WD45. The NGK plugs seem to hold up better then any plugs I have ever used



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VACLee

01-18-2020 17:50:12




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 Re: D17 series 1 plugs in reply to Luke470, 01-18-2020 16:07:48  
Don't know about the heat range but it is a tapered seat plug so it won't work reguardless.



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