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Reusing Spark Plugs

spark plugs using

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#1 ShelbyGT550 OFFLINE  

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Posted August 24, 2012 - 07:39 PM

Should this be done if the plugs are clean? Or should they be replaced every (Insert hours) and the old ones tossed instead of cleaning for the next change?

#2 Kurtee OFFLINE  

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Posted August 24, 2012 - 07:44 PM

If I take a spark plug out I replace it with new.

#3 Cvans OFFLINE  

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Posted August 24, 2012 - 07:48 PM

Spark plugs are cheap. If I ever have any question about how an engine is operating the plug or plugs get changed. A plug can look perfectly good and show a good arc but not fire under compression. When it comes to spark plugs, if in doubt throw it out.
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#4 Michiganmobileman OFFLINE  

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Posted August 24, 2012 - 08:46 PM

Spark plugs are cheap. If I ever have any question about how an engine is operating the plug or plugs get changed. A plug can look perfectly good and show a good arc but not fire under compression. When it comes to spark plugs, if in doubt throw it out.


Excellent way for that practical and true bit of advice to stick with us.

Thanks :thumbs:

#5 Utah Smitty OFFLINE  

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Posted August 24, 2012 - 09:24 PM

I agree... for the cost of one or two plugs, it isn't worth it.. just replace it.

#6 Bmerf OFFLINE  

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Posted August 24, 2012 - 09:30 PM

I agree, a plug may look good, but once it is fouled it is junk. Old plugs will only cause many unnecessary headaches when they decide to come and go. Unfortunately this is the voice of experience.

#7 Alc OFFLINE  

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Posted August 25, 2012 - 06:42 AM

If I foul a plug from trying to start an engine that was sitting a long time I might give the plug a cleaning and see if it starts . I don't change spark plugs that often only if there are starting issues . Maybe if my equipment was used commercially it would make a difference . What worse is putting a new plug in a good running engine only to have it fail shortly , which happened to the poor fellow that I bought my DB from this year , he had it running last year and it wouldn't start this year , plug looks very new guessing it was replaced last year , it had spark when laid on the head but wouldn't even make a pop when trying to start it , Bought it as a " non -running tractor" all it needed was a new plug . On our snowmobiles that's a different story seems like we change them all the time , maybe those old sleds are too fussy lol ,Al

#8 Amigatec OFFLINE  

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Posted August 25, 2012 - 07:03 AM

I have seen some engines just not like a certain brand of plug. I worked on a Ford 360 once that didn't like AC resistor plug, it would un fine on non-resistor AC's. Next day I bought some Autolites for it.
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#9 HDWildBill OFFLINE  

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Posted August 25, 2012 - 09:37 AM

As Chris said " if in doubt throw it out." I've even had plugs brand new out of the box not fire so don't be shy about putting 2 new plugs in if necessary.

#10 Canawler OFFLINE  

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Posted August 25, 2012 - 09:46 AM

if in doubt throw it out.


That rule applies to many things in life

......except wives :thumbs:
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#11 [email protected] OFFLINE  

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Posted August 25, 2012 - 10:56 AM

That rule applies to many things in life

......except wives :thumbs:


That's debatable :bigrofl:

#12 Bolens 1000 OFFLINE  

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Posted August 25, 2012 - 11:03 AM

Most of the time I clean my plugs with a spark plug cleaner http://www.google.co...29,r:3,s:0,i:86

They look like brand new when your done.
My Grandfather's Farmall Cub thats still in the family has its original plugs from 1949 and its still running Strong!

#13 Cvans OFFLINE  

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Posted August 25, 2012 - 11:38 AM

Most of the time I clean my plugs with a spark plug cleaner

Please make certain that all the abrasive material is removed from the plug after cleaning. All it takes is one grain of sand to score a cylinder or stick a piston ring. Back in the late 60's the dealership I worked for had an expensive plug cleaner and tester that used abrasives. Even after blowing the plugs off with compressed air we found if you lightly tapped the plugs on the work bench you might dislodge more abrasive from inside the pug. We quit cleaning plugs after that.

#14 LilysDad OFFLINE  

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Posted August 25, 2012 - 12:01 PM

Don't throw those plugs out! You can always use more sinkers for catfish.

#15 motormonkey OFFLINE  

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Posted September 04, 2012 - 08:07 PM

Sand or bead blasting spark plugs is accepted and standard procedure in the aircraft industry. You only replace them when the electrodes are eroded.

I can't remember the last time I replaced a spark plug in any machinery I own. A little bead or sand blast, and they are as good as new.

Edited by motormonkey, September 04, 2012 - 08:07 PM.






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