Go Back   The Ford Barn > General Discussion > Model A (1928-31)

Sponsored Links (Register now to hide all advertisements)

Reply
 
Thread Tools Display Modes
Old 09-05-2010, 06:49 PM   #1
Greg Jones
Senior Member
 
Greg Jones's Avatar
 
Join Date: Jul 2010
Location: Aiken, South Carolina
Posts: 602
Default 3x Plugs Shorting Out

I have heard of this but never had it happen to me, shorting of plugs. After not driving my A for a month or so, I fired it up and heard a snapping noise occaisonally, and the engine would stumble a bit and then pick back up. Then snap, snap, snap. I opened the hood and saw that one of the 3X plugs was shorting and sending the arc down the outside of the plug, a couple inches away from the plug. I know it is not uncommone, but what causes a plug to short like that? Dirty electrode? Cracked insulator?I pulled it and it looked fairly clean, nothing unusual, and could not see a crack or pit. I replaced the plug, but at $28 a copy I want to take good care of these.
Greg Jones is offline   Reply With Quote
Old 09-05-2010, 09:18 PM   #2
Frank Miller
Senior Member
 
Frank Miller's Avatar
 
Join Date: May 2010
Location: Auburn, MA
Posts: 1,776
Default Re: 3x Plugs Shorting Out

Try cleaning the exterior of the plug. You may have a hairline crack in the porcelain but if there is carbon on the outside the spark could be following it down instead of trying to jump the gap.
Frank Miller is offline   Reply With Quote
Sponsored Links (Register now to hide all advertisements)
Old 09-05-2010, 09:39 PM   #3
Dave H
Senior Member
 
Join Date: May 2010
Posts: 288
Default Re: 3x Plugs Shorting Out

Just a bit off topic but.....In looking at the Framk Miller can pictured under your name it dawned on me, I have a pint size can of "Frank Miller nut loosener" with a 12" spout. This guy must have been way before WD 40, Kroil, and anti-sieze compound. Anybody know the vintage of his wares or have a bio on him?
Dave H is offline   Reply With Quote
Old 09-09-2010, 10:26 AM   #4
FL&WVMIKE
Senior Member
 
FL&WVMIKE's Avatar
 
Join Date: May 2010
Location: Daytona Beach, Fl & Spencer, W. Va,
Posts: 4,425
Default Re: 3x Plugs Shorting Out

Greg Jones ......................
I think that the odds are, that you have a cracked insulator. Maybe you can't see it. It might just open up, when it warms up.
Using a non spark-plug socket can cause that. The spark-plug sockets have a rubber collar, inside, to keep the socket, straight, on the plug. A true spark-plug socket might be a good investment.
MIKE
FL&WVMIKE is offline   Reply With Quote
Old 09-09-2010, 10:33 AM   #5
30blutudor
Senior Member
 
30blutudor's Avatar
 
Join Date: May 2010
Location: Manawa,WI
Posts: 111
Default Re: 3x Plugs Shorting Out

I just use the wrench from my tool kit. I didn't even know they made a spark plug socket that size.
30blutudor is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Sponsored Links (Register now to hide all advertisements)


All times are GMT -5. The time now is 08:39 AM.