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  #1  
Old 06-19-2011, 10:45 AM
NDL NDL is offline
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Default :::Can I Use Full Thread Spark Plugs Instead Of Half Thread?

Hey All!

I have a 2001 Ranger, with the 2.5 Lima engine. I am going to do my second tuneup (first one was done at 80k). Seems that I can't get a handle on the original equipment plugs, which are half thread plugs.

Can I use full thread plugs, instead of the original half thread? If so, are there any issues I need to be aware of? I won't be using a torque wrench; I usually can "feel" when a plug is fully in, and firmly seated - so If I use the full thread plugs, how will I know that they are firmly seated - so I don't over tighten them?

Anyone use NGK, or Bosch plugs? I'd like to give them a try (I have been using Autolite...)

Thanks in advance for your help and suggestions!
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Old 06-19-2011, 12:53 PM
Huck Huck is offline
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Default Re: :::Can I Use Full Thread Spark Plugs Instead Of Half Thread?

I just picked up Bosch Super Pro's. Copper w/ Yiddium coat. Full threads. Had no problem with them.
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Old 06-21-2011, 09:54 AM
NDL NDL is offline
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Default Re: :::Can I Use Full Thread Spark Plugs Instead Of Half Thread?

Thanks for your feedback! Did you have a problem 'overtightening' the plugs? I'm worried that a 'full thread' plug might overextend itself in the head/combustion chamber.
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Old 06-21-2011, 10:02 AM
dixie_boysles dixie_boysles is offline
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Default Re: :::Can I Use Full Thread Spark Plugs Instead Of Half Thread?

not sure what you mean, but get the right sparkplugs, your truck will love you for it
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Old 06-21-2011, 10:38 AM
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Default Re: :::Can I Use Full Thread Spark Plugs Instead Of Half Thread?

In other words, unless I am mistaken, a spark plug will screw in only as far as the threads go. If I use a full thread plug (instead of the factory spec half-thread), will the extra threads on the full thread plug cause the plug to go deeper into the head - or will the full thread plug screw in just like the half thread plug?
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Old 07-17-2011, 12:36 PM
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Default Re: :::Can I Use Full Thread Spark Plugs Instead Of Half Thread?

Anyone else? I cannot find half thread plugs *anywhere* including the dealer.
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Old 03-05-2012, 03:02 PM
bentorl bentorl is offline
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Default Re: :::Can I Use Full Thread Spark Plugs Instead Of Half Thread?

Yes, you can interchange full thread plugs with half thread plugs. I replaced the full thread Champions in my 4-cyl 8 plug Lima with the original spec Autolite plugs and they both installed and operated fine.
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Old 03-06-2012, 06:36 AM
4b316 4b316 is offline
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Default Re: :::Can I Use Full Thread Spark Plugs Instead Of Half Thread?

They seat against the bottom of the plug base,not the threads.Use the autolites
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Old 03-06-2012, 06:56 PM
Lalogga Lalogga is offline
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Default Re: :::Can I Use Full Thread Spark Plugs Instead Of Half Thread?

Autolite AP764 half thread from rockauto.com for 2 bucks a piece. I found motorcraft oem half thread plugs last week at advanced auto. You are correct...dealer seems to be phasing out the 1/2 thread and replacing them with full. Get them while you can.
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