Oxygen Sensor Size???
Thread Starter
Heel & Toe
Joined: May 2003
Posts: 21
Likes: 0
From: Enterprise AL
Oxygen Sensor Size???
While removing a failing oxygen sensor on my 1988 Coupe the threads in the mount on the exhaust got pretty "boogered up". I would like to re-tap the exhaust port before installing the new sensor but have had a hard time getting information as to what size tap to use. I have of course tried to reverse engineer the process by trying to find a bolt that would fit the sensor and then of course I could buy the tap based on the bolt size. On the surface one might think this would be easy but I have been to several different hardware stores and none of the bolts (metric or standard) fit correctly.
Using a caliper in appears that the size of the O2 sensor is 11/16 or about 17 milimeters and the thread spacing seems to be about 16 per inch. Can anyone confirm my measurements. This tap size does not seem to be common so I will probably have to order it when I am sure about the size.
Using a caliper in appears that the size of the O2 sensor is 11/16 or about 17 milimeters and the thread spacing seems to be about 16 per inch. Can anyone confirm my measurements. This tap size does not seem to be common so I will probably have to order it when I am sure about the size.
Thread Starter
Heel & Toe
Joined: May 2003
Posts: 21
Likes: 0
From: Enterprise AL
Re: Oxygen Sensor Size??? (tdock)
tdock, Thanks for the info. It apprears that the size I need is 18 mm. This will get me on track now. I knew I could count on the forum to guidance. Cheers
Le Mans Master
Joined: May 2003
Posts: 5,203
Likes: 0
From: Las Vegas Nevada
Re: Oxygen Sensor Size??? (afree)
I just changed mine this morning along with my thermo. I measured the thread pitch on the old one and it was 18 I cant find my mic so thats the best I can do...good luck
Pitch was 18 TPI
[Modified by Southern Comfort, 1:06 PM 6/18/2003]
Pitch was 18 TPI
[Modified by Southern Comfort, 1:06 PM 6/18/2003]
Le Mans Master
Joined: Mar 2002
Posts: 5,889
Likes: 2
From: Castro Valley Calif.
St. Jude Donor '03 thru '26
Re: Oxygen Sensor Size??? (afree)
Just a shot in the dark cause I've never had mine off, but could it be pipe thread? If so, then an NPT tap should be fairly common I would think.....
Good luck! :cheers:
Good luck! :cheers:
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Burning Brakes
Joined: Feb 2000
Posts: 824
Likes: 2
From: Camden SC
Re: Oxygen Sensor Size??? (afree)
Head for a really good NAPA store. Ask for a spark plug tap. You may get a short tap requiring a 13/16" wrench. This will likely work. You may decide to buy some anit-sieze compound.
Good luck on this repair.
dlmeyers 90 coupe zf6 3 speed shocks
Good luck on this repair.
dlmeyers 90 coupe zf6 3 speed shocks
