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Adjusting spark plug gap

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recapen(at)earthlink.net
Guest

Posted: Thu May 21, 2009 4:19 am Post subject: Adjusting spark plug gap

I have the tool to measure the gaps and make the gap smaller - what are you using to make the gap bigger?  I don't want to risk damaging the center electrode or ceeramic.



I have some new plugs - fresh out of the box....their gaps are not consistent - some as low .015 and some as high as .025.  I want to make them all the same.....  



The plugs are UREM37BY and the outer electrodes go up then in (holding the plug in your hand with the working end up - kinda like car plugs), as opposed to in then up (which I've seen in pictures - not on my plane).



Thanks,

Ralph

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denis.walsh(at)comcast.ne
Guest

Posted: Thu May 21, 2009 4:59 am Post subject: Adjusting spark plug gap

I use a pair of small needlenose pliers with a 90 degree bend in them,  

very carefully.  I use the  regular tools for bending them in, since  

the danger to ceramic is greater.



Am looking forward to getting some better ideas from the list!



DW

On May 21, 2009, at 6:16 , Ralph E. Capen wrote:



 	  Quote: 	
		   

 <recapen(at)earthlink.net>



 I have the tool to measure the gaps and make the gap smaller - what  

 are you using to make the gap bigger?  I don't want to risk damaging  

 the center electrode or ceeramic.



 I have some new plugs - fresh out of the box....their gaps are not  

 consistent - some as low .015 and some as high as .025.  I want to  

 make them all the same.....



 The plugs are UREM37BY and the outer electrodes go up then in  

 (holding the plug in your hand with the working end up - kinda like  

 car plugs), as opposed to in then up (which I've seen in pictures -  

 not on my plane).



 Thanks,

 Ralph

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Kellym

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

Posted: Thu May 21, 2009 5:37 am Post subject: Adjusting spark plug gap

Leave the small gap where it is. It will erode to .016-.018 very 

shortly. Reduce the gap on the others to the specified .016-.018 range. 

Trying to bend for increased gap is asking for trouble.

KM

A&P/IA



Ralph E. Capen wrote:

 	  Quote: 	
		   



 I have the tool to measure the gaps and make the gap smaller - what are you using to make the gap bigger?  I don't want to risk damaging the center electrode or ceeramic.



 I have some new plugs - fresh out of the box....their gaps are not consistent - some as low .015 and some as high as .025.  I want to make them all the same.....  



 The plugs are UREM37BY and the outer electrodes go up then in (holding the plug in your hand with the working end up - kinda like car plugs), as opposed to in then up (which I've seen in pictures - not on my plane).



 Thanks,

 Ralph

   


	


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

recapen(at)earthlink.net
Guest

Posted: Thu May 21, 2009 5:46 am Post subject: Adjusting spark plug gap

Thanks Denis,



I have a tool that I used on my car spark plugs - but haven't found the same thing for these Massive Electrode units.



http://www.mytoolstore.com/kd/kdfeel02.html are the car ones and they work fine for automotive plugs but the openings to adjust the gap outward are not big enough for aviation plug side electrodes.



I'll check with my local A&P......



The search continues



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recapen(at)earthlink.net
Guest

Posted: Thu May 21, 2009 6:10 am Post subject: Adjusting spark plug gap

Kelly,



I thought that there was the potential for messing something up - hence the question.



I'm guessing that as long as the plug has some gap (they all did) to fire, the engine will run.....



Ralph



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Kellym

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

Posted: Thu May 21, 2009 7:39 am Post subject: Adjusting spark plug gap

Correct, and your tightest gap is only .001 less than specified. Leave 

well enough alone and just deal with the plug(s) that are out of spec 

too wide.



Ralph E. Capen wrote:

[quote] 



 Kelly,



 I thought that there was the potential for messing something up - hence the question.



 I'm guessing that as long as the plug has some gap (they all did) to fire, the engine will run.....



 Ralph



 --

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

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