02-26-2021, 06:31 AM
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#1
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Registered User
Join Date: Jul 2011
Location: Richmond, VA (The Fan)
Posts: 978
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Transmission Drain Plug Size (internet seems to be wrong)
I'm trying to replace my drain and fill plugs with AN fittings to for a trans cooler. I looked up the thread size and I can see multiple sites claiming its M18 1.5 but that is too small and the incorrect threads. The fitting on my transmission are tappered threads. Anyone know the correct size?
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1997 Boxster 4.2L Audi V8 Bi-Turbo
2003 911 C2
NASA HPDE Instructor
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02-26-2021, 06:58 AM
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#2
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Registered User
Join Date: Jul 2011
Location: Richmond, VA (The Fan)
Posts: 978
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I posted too soon, they're M24 X 1.5. Or at least I think they are. they're tapered though which is a problem, I can't seem to find M24 X 1.5 tappered threads to AN. Surely someone has solved this problem..right?
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1997 Boxster 4.2L Audi V8 Bi-Turbo
2003 911 C2
NASA HPDE Instructor
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02-26-2021, 06:59 AM
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#3
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Registered User
Join Date: Oct 2014
Location: California Central Coast
Posts: 1,476
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When i had mine out it appeared to be regular 1/2" NPT. I didn't test, so not positive.
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02-26-2021, 07:43 AM
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#4
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Registered User
Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 6,277
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Quote:
Originally Posted by truegearhead
I posted too soon, they're M24 X 1.5. Or at least I think they are. they're tapered though which is a problem, I can't seem to find M24 X 1.5 tappered threads to AN. Surely someone has solved this problem..right?
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Yup: A welder.
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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02-26-2021, 07:53 AM
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#5
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Registered User
Join Date: Oct 2020
Location: KY
Posts: 1,216
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There's an aftermarket kit for transmission cooler made by tunermotorsports. Maybe try to contact them to see where they source the fittings?
Sent from my POCOPHONE F1 using Tapatalk
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2000 Box Base, Renegade Stage 1 performance mods complete, more to come
When the owners manual says that the laws of physics can't be broken by this car, I took it as a challenge...
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02-26-2021, 09:57 AM
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#6
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Who's askin'?
Join Date: Mar 2018
Location: Utah
Posts: 2,446
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I actually just went through this this week. Yes, it is an M24x1.5 tapered thread.
I couldn't find any off- the- shelf fittings that would work without adding too much of a "hang-down". ;-)
I went to my local Bridgestone hose products store, where their genius in the back built me a fitting.
He drilled the plug, and then welded in an NPT fitting. From there, I actually added a Tee, so that I could also plumb a temp Gauge.
Sent from my SM-G970U using Tapatalk
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02-27-2021, 02:02 AM
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#7
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Registered User
Join Date: Oct 2012
Location: Cincinnati, Ohio
Posts: 373
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Try British American Thermal in Fla. they have many fittings.
https://www.batinc.net/plumbing
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02-27-2021, 04:17 AM
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#8
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Registered User
Join Date: Oct 2020
Location: KY
Posts: 1,216
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Quote:
Originally Posted by maytag
I actually just went through this this week. Yes, it is an M24x1.5 tapered thread.
I couldn't find any off- the- shelf fittings that would work without adding too much of a "hang-down". ;-)
I went to my local Bridgestone hose products store, where their genius in the back built me a fitting.
He drilled the plug, and then welded in an NPT fitting. From there, I actually added a Tee, so that I could also plumb a temp Gauge.
Sent from my SM-G970U using Tapatalk
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If you haven't installed them yet, can you take pics?
Sent from my POCOPHONE F1 using Tapatalk
__________________
2000 Box Base, Renegade Stage 1 performance mods complete, more to come
When the owners manual says that the laws of physics can't be broken by this car, I took it as a challenge...
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02-27-2021, 05:10 AM
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#9
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Who's askin'?
Join Date: Mar 2018
Location: Utah
Posts: 2,446
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Quote:
Originally Posted by ike84
If you haven't installed them yet, can you take pics?
Sent from my POCOPHONE F1 using Tapatalk
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I'm sorry, i installed it same day. But I'll see if I can snap a pic with it in place. (Unfortunately, I already put the stressed- member plate back on as well)
Sent from my SM-G970U using Tapatalk
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