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Unread 10-05-2011, 07:00 AM   #1
82KansasCJ
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Bolt/Plug/Thread sizes for O2 Sensor?

Borla exhaust has a bung already welded in for the O2 sensor. The lightweight aluminum type plug that the PO installed never fit just right and would back out. Well the other night it blew out! Interesting are the exhaust sounds of the 258 straight out of the header pipe

I bought a couple of plugs but they don't appear to be the right size. 1/2" is too big and 3/8" was just a shade small. I've got the 3/8" in there with some high temp silicone as a temporary solution but need to find a better alternative. Local parts store guys can't seem to tell me....go figure.

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Unread 10-05-2011, 07:05 AM   #2
BioTex
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I always thought they were the same thread as the spark plugs. Couldn't you cut off a plug and see?
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Unread 10-05-2011, 07:08 AM   #3
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Quote:
Originally Posted by BioTex View Post
I always thought they were the same thread as the spark plugs. Couldn't you cut off a plug and see?
If that is the case they are alot finer thread than the plug the PO had installed....and that might very well be the case. I could always hook up a fake plug boot to it and tell everyone it was part of the emission controls to make sure all the fuel was burned before it went out the exhaust
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Unread 10-05-2011, 07:17 AM   #4
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Quote:
Originally Posted by 82KansasCJ View Post
If that is the case they are alot finer thread than the plug the PO had installed....and that might very well be the case. I could always hook up a fake plug boot to it and tell everyone it was part of the emission controls to make sure all the fuel was burned before it went out the exhaust
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1971 800B with 345/T-19
06' TJ Rubicon, 4" R.C. springs, BFG/AT 35s M.C. 6" fenders, rockers and surrounds, Currie front & rear adj. tracbars, tattons DC rear shaft, adj. upper - lower CA's. Bilstein 5100's
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Unread 10-05-2011, 12:13 PM   #5
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OK....now after trying to figure out what the thread size/count is for the spark plugs I've found several sizes....anyone know for sure what the 258 took?
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Unread 10-05-2011, 01:01 PM   #6
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The standard O2 sensor thread is a Metric size... M18x1.5
I've got a hand full of plugs in the garage. PM me your address and I'll put one in the mail for you...
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Unread 10-05-2011, 01:32 PM   #7
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The standard O2 sensor thread is a Metric size... M18x1.5
I've got a hand full of plugs in the garage. PM me your address and I'll put one in the mail for you...
Thanks for the offer! The M18 x 1.5 seems to be a common theme when searching for O2 sendsor threads etc. So I snuck over to the local hardware store and they had a metric section with "metric oil pan plugs". It contained the only M18 x 1.5 bolt in the whole place! I'll give it a try and if the size/pitch are right it looks like it will work great as it has a nice flange to tighten against since the bung doesn't have a "bottom" to tighten against. I'll let everyone know how it works.
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Unread 10-05-2011, 03:06 PM   #8
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Here's a pic of the plugs I have. Sounds like you've already found something that will work.
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Unread 10-05-2011, 06:37 PM   #9
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Yes, 18x1.5mm and Summit Racing has them in stainless also for about $6.00.
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Unread 10-05-2011, 10:40 PM   #10
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If not head over to a local exhaust shop ask one of the mechanics for one they will prob give it to you. when you buy a whole section of pipe with a preinstalled o2 bung they all are plugged and have them lying everywhere after doing hundereds of them
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