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Thread size for the oxygen sensor
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ourv12
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PostPosted: Sat Sep 25, 2021 7:46 pm    Post subject: Thread size for the oxygen sensor Reply with quote

Anyone know the thread size for the oxygen sensor on the vanagon catalytic converter? I need to chase the threads , thanks
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DanHoug
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PostPosted: Sat Sep 25, 2021 8:38 pm    Post subject: Re: Thread size for the oxygen sensor Reply with quote

18mm x 1.5mm
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Sodo
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PostPosted: Sun Sep 26, 2021 7:13 am    Post subject: Re: Thread size for the oxygen sensor Reply with quote

Dan you must be a bung welder? Laughing
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wesitarz
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PostPosted: Sun Sep 26, 2021 6:28 pm    Post subject: Re: Thread size for the oxygen sensor Reply with quote

DanHoug wrote:
18mm x 1.5mm


My O2 sensor plug thread looks slight smaller than a 20mm x 1.5 so 18 must be it.
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jlrftype7
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PostPosted: Mon Sep 27, 2021 12:13 pm    Post subject: Re: Thread size for the oxygen sensor Reply with quote

Here's my two old go-to tools, as Dan noted, 18mm x 1.50mm thread.
There are other O2 sensor threads out there, but thankfully we don't use them, so these dead common tools are easier to find.

Chaser if the space is tight, and actual tap if the threads won't work with the chaser due to damage or rust. Tap needs way more room though to work... Rolling Eyes


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brickster
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PostPosted: Thu Oct 05, 2023 8:16 am    Post subject: Re: Thread size for the oxygen sensor Reply with quote

My O2 port's threads are damaged after removing the sensor. I've never used a tap before, but plan to pick one up from a FLAPS to cope. From the looks of things, I'll also need to buy a handle for it, correct?

I've done some web searches and it looks pretty straightforward (use oil, carefully start the tool to ensure correct, perpendicular cutting, after partial-turn resistance, turn backward before continuing, etc.). Since space is tight, I'm wondering if anyone was able to use a tap + handle in the same scenario.

Mostly, I'm looking for TheSamba to feed me optimistic feedback, success stories, etc. ;^)
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Ahwahnee
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PostPosted: Thu Oct 05, 2023 8:41 am    Post subject: Re: Thread size for the oxygen sensor Reply with quote

brickster wrote:
...I'll also need to buy a handle for it, c Drorrect?


Ideally, yes. But I have also used a wrench or 8-point socket when swing room was limited or ratcheting was useful.
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brickster
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PostPosted: Thu Oct 05, 2023 4:02 pm    Post subject: Re: Thread size for the oxygen sensor Reply with quote

Ahwahnee wrote:
brickster wrote:
...I'll also need to buy a handle for it, c Drorrect?


Ideally, yes. But I have also used a wrench or 8-point socket when swing room was limited or ratcheting was useful.


I can’t seem to get the tap started because the top threads are gone and it won’t catch on the bottom. There isn’t enough room to use a handle to exert downward pressure. Do I have any other options?
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Wildthings
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PostPosted: Thu Oct 05, 2023 4:57 pm    Post subject: Re: Thread size for the oxygen sensor Reply with quote

Slowly turn the tap with a wrench while you tap LIGHTLY on the end of the tap with a hammer. Removing the exhaust might be in order.
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dougnlina Premium Member
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PostPosted: Thu Oct 05, 2023 5:57 pm    Post subject: Re: Thread size for the oxygen sensor Reply with quote

brickster wrote:
Ahwahnee wrote:
brickster wrote:
...I'll also need to buy a handle for it, c Drorrect?


Ideally, yes. But I have also used a wrench or 8-point socket when swing room was limited or ratcheting was useful.


I can’t seem to get the tap started because the top threads are gone and it won’t catch on the bottom. There isn’t enough room to use a handle to exert downward pressure. Do I have any other options?


Are you using a tapered tap? they are best for "finding" lost threads lower in the hole, proceed with caution...
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brickster
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PostPosted: Thu Oct 05, 2023 8:07 pm    Post subject: Re: Thread size for the oxygen sensor Reply with quote

dougnlina wrote:
Are you using a tapered tap? they are best for "finding" lost threads lower in the hole, proceed with caution...

Yes, and thanks to Wildthings’ tip to tap the top of the tap, I was able to cut new threads. With the tin shield removed, I had just enough room. I then used a magnet to get the shavings out.
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