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Old 05-02-2021, 03:09 PM   #1
sheepbleat
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Default Plug for O2 Sensor Hole in Manifold

Car: ‘91 244 w/ B230F, NA

Replacing my exhaust manifold with one from the junkyard. New one’s got a hole for an O2 sensor, but I was planning on running the sensor down by the cat.

What should I plug the hole in the manifold with? Is a regular bung plug capable of withstanding that heat, or should I be buying a bolt that matches the thread pitch?

Thanks as always!
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Old 05-02-2021, 03:15 PM   #2
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.
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Old 05-02-2021, 03:50 PM   #3
hiperfauto
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According to Skandix that plug is M16 x 1.5. I believe it's for the EGR fitting, not the O2 sensor although now that I think about it that's probably what he needs.

O2 sensors are M18 x 1.5.

http://www.siliconeintakes.com/dsm-i...xoCkbAQAvD_BwE
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Old 05-02-2021, 04:40 PM   #4
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Thanks both! There was an old O2 sensor in there originally, so it’s probably M18 x 1.5. I’ll pull the trigger on that bolt.
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Old 05-02-2021, 04:59 PM   #5
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Sorry, I did indeed confuse it with the EGR plug.
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Old 05-02-2021, 07:52 PM   #6
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spark plug
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Old 05-05-2021, 04:17 PM   #7
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I plugged that with a cheap O2 sensor cap off Amazon and an oil drain washer - worked great.

http://forums.turbobricks.com/showpo...5&postcount=57
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Old 05-05-2021, 11:46 PM   #8
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I've had manifolds with both EGR and O2 sensors, EGR from just two exhaust ports while obviously the O2 sensor overlaps both 1-2&3-4. Wanna say they where different sizes aswell, but problem solved anyways
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Old 05-06-2021, 06:11 AM   #9
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GM makes an O2 sensor hole plug, 10017198, that's cheap and does not require a gasket.
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Old 05-06-2021, 11:22 AM   #10
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I used an M18x1.5 oil drain plug on my 90+ EGR port, easy to find off the rack at the chain stores usually. Can't comment on the NA thread size, but you may be able to get a plug for it from the chain stores as well. Just don't use the plastic/rubber gasket. lol
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Old 05-06-2021, 07:05 PM   #11
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M18x1.5 oil drain plug?
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Old 05-06-2021, 07:07 PM   #12
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Just don't use the plastic/rubber gasket. lol
You'd be surprised the number of nylon lock nuts people use for exhaust hardware
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Old 05-06-2021, 07:24 PM   #13
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Sadly, yeah, I'd believe it Jimmy. lol

Yeah lummert...oil drain plug...just not a redblock one. No idea what it fits, found it hanging on the 'Help!' section at one of the chain stores in town.
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Old 05-07-2021, 01:19 AM   #14
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Quote:
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You'd be surprised the number of nylon lock nuts people use for exhaust hardware
I made that mistake once. The exhaust leak and burning plastic smell informed me that it was a bad idea. It pays to check if the nut you grabbed from your of assorted hardware is a nylon lock nut.
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