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What vehicle(s) do these spark plugs fit?


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#1 hirsca

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Posted 22 March 2019 - 04:00 PM

I have six of these found at an estate sale.  The tube is approx. 3.25" tall with steel caps at both ends.  I have searched on line using all of the varios nomenclature, but, no luck.  I searched the g503 forum without luck.  I don't belong to that forum, so I don't think that I can post pictures there.  Any help with an ID on these is much appreciated.

 

Thanks, Al 

 

 

 

 

 

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#2 72psb

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Posted 22 March 2019 - 04:44 PM

Could almost be any vehicle, aircraft  or generator. You would need to research the numbers,short of taking one from the tube.



#3 hirsca

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Posted 22 March 2019 - 04:56 PM

Could almost be any vehicle, aircraft  or generator. You would need to research the numbers,short of taking one from the tube.

 

Thanks, but like I said in the OP, I have searched all of the numbers and words on the tube.

 

Thanks again, Al


Edited by hirsca, 22 March 2019 - 04:59 PM.


#4 USARV72

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Posted 22 March 2019 - 08:25 PM

Without TM’s guessing M211, gas M-35( both 2 1/2 ton) or M-37 3/4 ton ? What’s complete info?

#5 hirsca

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Posted 23 March 2019 - 04:08 AM

Thanks USARV72.  Not sure I understand your question, but because of the large size of the spark plugs, 18mm, you think that they are for large vehicles as opposed to a Jeep?  I searched the Sovebolt forum and there is lots of info on spark plugs, but nothing on those in question.

 

Thanks again,

Al



#6 USARV72

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Posted 23 March 2019 - 04:40 AM

What all is printed on canister? IIRC M-37 plugs are good sized, heavy duty. Many times parts were “ over packed” in larger containers to protect parts, especially electrical ones. Most likely a set for 6 cylinder engine, reason posted M-211, gas M-35 or M-37, all 6 cylinder. Nice find , any MVPA guys close to you?

#7 hirsca

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Posted 23 March 2019 - 06:29 AM

What all is printed on canister? IIRC M-37 plugs are good sized, heavy duty. Many times parts were “ over packed” in larger containers to protect parts, especially electrical ones. Most likely a set for 6 cylinder engine, reason posted M-211, gas M-35 or M-37, all 6 cylinder. Nice find , any MVPA guys close to you?

 

The printing on the tube is show on my original post.  Good idea about seeing if there are any MVPA members in my area.  I'll check that out.

 

Thanks, 

Al



#8 USARV72

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Posted 23 March 2019 - 10:37 AM

Can not tell everything printed on tube, thats the question. Post it if possible.

#9 hirsca

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Posted 23 March 2019 - 11:49 AM

Can not tell everything printed on tube, thats the question. Post it if possible.

 

Since the tube is round, I can't capture all of the printing in one photo.  In my OP, I rotated the tube to capture all of the printing in three sucessive photos.

 

Thanks, Al



#10 USARV72

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Posted 23 March 2019 - 02:09 PM

K, if thats it I’ll call a couple of vehicle guys that may know.

#11 hirsca

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Posted 23 March 2019 - 03:32 PM

K, if thats it I’ll call a couple of vehicle guys that may know.

 

Thank you!

 

Al



#12 aznation

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Posted 23 March 2019 - 03:46 PM

H004-0501032

Plug, Spark, 18MM

1, Each, APB 18-H

DA-20-1130ORD-12311

Auburn Spark Plug Co., Inc.

Auburn, N.Y.

9/52



#13 hirsca

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Posted 23 March 2019 - 04:16 PM

H004-0501032

Plug, Spark, 18MM

1, Each, APB 18-H

DA-20-1130ORD-12311

Auburn Spark Plug Co., Inc.

Auburn, N.Y.

9/52

 

Thanks aznation.  By the way, I have reached out to one of the North Texas MVPA groups.  Waiting for a reply.

 

Thanks again,

 

Al



#14 aznation

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Posted 23 March 2019 - 04:21 PM

You're welcome.

 

I also found this.

 

Source:  Fultonhistory.com

 

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#15 hirsca

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Posted 23 March 2019 - 04:33 PM

You're welcome.

 

I also found this.

 

Source:  Fultonhistory.com

 

 

Thanks, very interesting.  The article is dated in 1954 saying that Auburn "is developing" an eighteen millimeter spark plug, while the tubes that I have are dated 1952.  Are both clips from the same issue?

 

Thanks again, Al



#16 aznation

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Posted 23 March 2019 - 04:37 PM

Thanks, very interesting.  The article is dated in 1954 saying that Auburn "is developing" an eighteen millimeter spark plug, while the tubes that I have are dated 1952.  Are both clips from the same issue?

 

Thanks again, Al

 

Yes, both clips are from the same issue.  The tube/s have 9/52 printed on them, but perhaps it's possible that it doesn't mean a month or year?  Just a thought.



#17 hirsca

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Posted 23 March 2019 - 05:00 PM

 

Yes, both clips are from the same issue.  The tube/s have 9/52 printed on them, but perhaps it's possible that it doesn't mean a month or year?  Just a thought.

 

Based on what all else is printed on the tubes, I'm pretty sure it is a date.

 

Thanks, Al



#18 aznation

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Posted 23 March 2019 - 05:42 PM

Early prototype?  



#19 hirsca

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Posted 23 March 2019 - 05:49 PM

Could be.  Hoping to hear back from the MVPA soon.

 

Al



#20 oldabewla

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Posted 25 March 2019 - 04:59 PM

These 18mm plugs were used for the post war HARLEY-DAVIDSON WLA's Motorcycles these are the smaller body type plugs.
The WWII HD plugs were larger bodies and are way more desirable.
I have a set of these in my collection.

Craig

#21 oldabewla

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Posted 25 March 2019 - 05:38 PM

From Vintage Harley restoration book These plugs are replacement ones not made by Champion as we know.

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#22 hirsca

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Posted 26 March 2019 - 03:54 AM

From Vintage Harley restoration book These plugs are replacement ones not made by Champion as we know.

 

Great information Craig!  Thank  you very much.  In the paragraph that begins with "Thanks to World War II," it mentioms that these spark plugs "still exist new, although expensive."  Can you help me with an estimate of current value?

 

Thanks again, Al



#23 USARV72

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Posted 26 March 2019 - 04:21 AM

Check ebay, some are listed out of package. Called MVPA guys, didnt have reference for plugs. One suggested AVOS M-41 engine???

#24 hirsca

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Posted 26 March 2019 - 07:27 AM

Check ebay, some are listed out of package. Called MVPA guys, didnt have reference for plugs. One suggested AVOS M-41 engine???

 

Thank you for the leads.  Checked eBay, nothing.  Have left message with local MVPA club, no response yet.  The AVOS M-41 engine was produced from 1994 to 2000, 40+ years after these plugs were made in September 1952.  Doubtful if there is any connection.

 

Thanks again,

Al



#25 USARV72

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Posted 26 March 2019 - 09:19 AM

IIRC M -41 was produced the end of WWII, same engine used in M-42 Duster. I didnt look up engine, just what I was told. There are original Harley WLA spark plugs on ebay, not military, guessing military ones may be more valuable?


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