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  #1  
Old 05-20-2019, 11:01 AM
Piper J3's Avatar
Piper J3 Piper J3 is offline
 
Join Date: Nov 2014
Location: Hinckley, Ohio
Posts: 1,389
Default Spark Plug Caps…

I was having noise in the SL40 comm radio on my RV-12. After a lot of troubleshooting I decided to replace the spark plug caps. I had a suspicion that the 5-ohm ceramic resistor may have been damaged from pulling (manhandling) the rubber caps when removing the plug wires. The rubber cap is easily deformed.

I purchased new NGK Spark Plug Resistor Cover – 90 deg Elbow Type LB05F on eBay for $49.68 for qty (8). These caps are rigid phenolic and should prevent future damage to the internal 5- ohm resistor. Installation is very simple – just unscrew old cap from wire end and screw on new cap.

Radio noise problem is now fixed…

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Jim Stricker
Hinckley, Ohio (1OA2)
EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2007
80 hrs Flying Aeronca Chief 11AC N86203
1130 hrs Flying 46 Piper J-3 Cub N6841H
RV-12 E-LSA #120058 AWC July 2012 N633CM
RV-12 Bought Flying Oct 2015 with 48TT - Hobbs now 441

LSRM-A Certificate 2016
Special Thanks... EJ Trucks - Crew Chief A-4 Skyhawk
and MJ Stricker (CFI) - 1st Lt. Captain B-17H

Last edited by Piper J3 : 05-21-2019 at 02:35 AM.
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  #2  
Old 05-20-2019, 06:27 PM
Driftdown Driftdown is offline
 
Join Date: Jan 2011
Location: Clearwater, Florida
Posts: 360
Default

That is an awesome tip!
Thank you for posting.

Any chance you could post a link to the caps you purchased? . .
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  #3  
Old 05-20-2019, 08:44 PM
Bob Y Bob Y is offline
 
Join Date: Jul 2017
Location: Piedmont, SC
Posts: 60
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Looks like a better deal at Summit Racing - including shipping charge.

https://www.summitracing.com/search?...B05F%29%208051
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  #4  
Old 05-21-2019, 04:31 PM
Driftdown Driftdown is offline
 
Join Date: Jan 2011
Location: Clearwater, Florida
Posts: 360
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Quote:
Originally Posted by Bob Y View Post
Looks like a better deal at Summit Racing - including shipping charge.
https://www.summitracing.com/search?...B05F%29%208051
Thank you!
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