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Temperature (metric) units puzzle

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DBerelsman(at)aol.com
Guest

Posted: Tue Nov 14, 2006 4:30 am Post subject: Temperature (metric) units puzzle

Great question Giles...

  

 Here is another nail in the coffin of the folks who moan "I love  American non-standard measurement".

  

 Last summer I was repairing my fathers 1951 John Deere B farm tractor.  What's more American than John Deere ?.

  

 The tattered owners manual calls for 18mm Champion spark  plugs.

  

 What happened to our good sense ?

  

  

  [quote][b]

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jindoguy(at)gmail.com
Guest

Posted: Tue Nov 14, 2006 5:20 am Post subject: Temperature (metric) units puzzle

The answer to this one is pretty simple. Bosch was the first maker of spark plugs and set the standard. you could probably go back to a 1921 owner's manual and find the same reference. So far as I know, spark plugs are all metric thread and always have been. 



Rick



On 11/14/06, DBerelsman(at)aol.com (DBerelsman(at)aol.com) <DBerelsman(at)aol.com (DBerelsman(at)aol.com)> wrote: [quote]     Great question Giles...

  

 Here is another nail in the coffin of the folks who moan "I love  American non-standard measurement".

  

 Last summer I was repairing my fathers 1951 John Deere B farm tractor.  What's more American than John Deere ?.

  

 The tattered owners manual calls for 18mm Champion spark  plugs.

  

 What happened to our good sense ?

  

  

   	  Quote: 	
		  [b]  www.aeroelectric.com http://www.matronics.com/Navigator?AeroElectric-List 	


-- 

Rick Girard

"Ya'll drop on in"

takes on a whole new meaning

when you live at the airport.  [quote][b]

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oldbob(at)BeechOwners.com
Guest

Posted: Tue Nov 14, 2006 5:39 am Post subject: Temperature (metric) units puzzle

Good Morning Richard,



How very true, but, fortunately, the ones we have been

using for aviation here in our crazy mixed up country

have had a hex drive portion that was made to fit our

good old fashioned foot/inch measurement system.



I'd say odds are that old John Deere/Champion plug

used a non metric wrench to aid it's extraction.



Have you ever noted that aircraft mechanics world wide

seem to have standardized on our system as well?



Will wonders never cease?



Happy Skies,



Old Bob



--- Richard Girard <jindoguy(at)gmail.com> wrote:



 	  Quote: 	
		   The answer to this one is pretty simple. Bosch was

 the first maker of spark

 plugs and set the standard. you could probably go

 back to a 1921 owner's

 manual and find the same reference. So far as I

 know, spark plugs are all

 metric thread and always have been.

 

 Rick

 

 On 11/14/06, DBerelsman(at)aol.com <DBerelsman(at)aol.com>

 wrote:

 >

 >  Great question Giles...

 >

 > Here is another nail in the coffin of the folks

 who moan "I love American

 > non-standard measurement".

 >

 > Last summer I was repairing my fathers 1951 John

 Deere B farm tractor.

 > What's more American than John Deere ?.

 >

 > The tattered owners manual calls for *18mm

 Champion spark plugs*.

 >

 > What happened to our good sense ?

 >

 >

 >

 > *

 >

 >

 > *

 >

 >

 

 

 -- 

 Rick Girard

 "Ya'll drop on in"

 takes on a whole new meaning

 when you live at the airport.

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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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Kellym

Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ

Posted: Tue Nov 14, 2006 7:36 pm Post subject: Temperature (metric) units puzzle

So explain how virtually every American car post WWII used 14mm plugs, 

until they went to those tiny ones. Perhaps 14mm and 18mm just happen to 

be equal to an English thread size. Especially since they both require 

an English unit plug socket, either 13/16 or 7/8.

DBerelsman(at)aol.com wrote:

 	  Quote: 	
		   Great question Giles...

  

 Here is another nail in the coffin of the folks who moan "I love 

 American non-standard measurement".

  

 Last summer I was repairing my fathers 1951 John Deere B farm tractor. 

 What's more American than John Deere ?.

  

 The tattered owners manual calls for *_18mm_ Champion spark plugs*.

  

 What happened to our good sense ?

  

  

 *

 *

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_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
KCHD

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