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  #1  
Old 05-07-2018, 12:52 PM
Paul Eastham's Avatar
Paul Eastham Paul Eastham is offline
 
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Posts: 503
Default Use auto plugs? NGK? Check those ferrules are tight...

You know, the ferrule, the little metal bit at the top of the plug where you plug the wire in.

I just checked my plane -- four out of four were loose and wobbly.
They are brand new NGK plugs replaced at annual only ~5 hours ago. I didn't notice them to be loose when I installed them, but didn't explicitly check them for this. And I've been using this brand/type for the past 10 years, never noticed this before.

I recently had some ignition trouble (old thread here) which I think was caused by this. First I thought it was caused by ignition wires (two of them were indeed flaky when bent just right so maybe I prevented a future failure there), then I thought it was the Lightspeed coil (one coil was indeed bad), but the root cause, according to Lightspeed, was probably the loose ferrule which causes heating in the coil and failure.

And of course who knows what kind of weak spark you get when that thing is loose...hopefully a gentle turn with a pair of pliers will keep them in place.
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  #2  
Old 05-07-2018, 12:57 PM
rv7charlie rv7charlie is offline
 
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Default

IIRC, they're available with non-removable terminals. Slightly different p/n.
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  #3  
Old 05-07-2018, 01:04 PM
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Brantel Brantel is offline
 
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Yep, the ones with the removable tip are not recommend.

Get the ones with the fixed tip.

You have to ask for the specific 4 digit part number at the auto stores to get the right ones.

From the PMAG manual:

"NGK BR8ES 2.5mm Center Electrode (NGK stock #3961 has
solid/permanent terminal post, NGK stock #5422 has a screw on post)"
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  #4  
Old 05-07-2018, 01:06 PM
rv8ch rv8ch is offline
 
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Default vice grips are your friend

Learned this ages ago when racing motocross - vice grips to pinch them a bit, then install them very tight. No idea why they still make the removable nipples - I guess some very old spark plug caps still need the threaded terminal.
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  #5  
Old 05-07-2018, 01:32 PM
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SmilingJack SmilingJack is offline
 
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Quote:
Originally Posted by Brantel View Post
Yep, the ones with the removable tip are not recommend.

Get the ones with the fixed tip.

You have to ask for the specific 4 digit part number at the auto stores to get the right ones.

From the PMAG manual:

"NGK BR8ES 2.5mm Center Electrode (NGK stock #3961 has
solid/permanent terminal post, NGK stock #5422 has a screw on post)"
Like Brantel said, order the specific 4 digit part number, but I donít recommend ordering from Amazon. I did that and DID order the exact 4 digit part number only to receive the non-fixed tip.

Better off going to the Advanced Auto Part or Auto Zone.
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  #6  
Old 05-07-2018, 01:45 PM
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Paul Eastham Paul Eastham is offline
 
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Wow, I had no idea there was an alternate part. Been ordering the same part number from Rock Auto since forever, which was the recommendation at the time from a number of people on this forum. Just bought a 5 year supply, oops!
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Old 05-07-2018, 03:27 PM
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Ironflight Ironflight is offline
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Quote:
Originally Posted by Paul Eastham View Post
Wow, I had no idea there was an alternate part. Been ordering the same part number from Rock Auto since forever, which was the recommendation at the time from a number of people on this forum. Just bought a 5 year supply, oops!
Rock Auto also carries the fixed tip ones (#3961), and you can find them that way in their search function.
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  #8  
Old 05-07-2018, 05:40 PM
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smokyray smokyray is offline
 
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Default Plugged Up...

For auto plugs I like the Denso L-14U and Autolite 386, both available from NAPA or Amazon and selected WalMarts. They thread right in without adapters...

Additionally, I have used Accel plug wires for 25 years with no issues whatsoever.
V/R
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  #9  
Old 05-07-2018, 06:20 PM
CDN CDN is offline
 
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Location: Calgary, AB
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Default NGK plugs

Aircraft Spruce has the BR8ES with solid terminals. It's not listed specifically as such but that's where I buy mine and they're always solid tops.
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  #10  
Old 05-07-2018, 08:44 PM
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n82rb n82rb is offline
 
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The auto zone down the street from my airport stocks them.

Bob burns
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