11-08-2024, 09:24 PM
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#1
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Registered User
Join Date: Oct 2024
Location: San Jose, California
Posts: 51
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Help! Transmission fluid change gone wrong...maybe?
Went to do my first transmission fluid change on my new to me 2002 986 5 speed manual this evening.
Took me a while to find the fill plug, and it wasn't exactly what I expected:
I drained the old fluid out of the drain hole. Then went to put the new fluid into this fill hole. Having pumped in a gallon of fluid I'm starting to think this wasn't the right filler hole... 
I decided to reitre from it for the night before I do any more damage, but can anyone here help let me know where I've just pumped a gallon of transmission fluid. And how disastrous this might be? 
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11-08-2024, 10:06 PM
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#2
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Multi-Boxer Driver
Join Date: Nov 2010
Location: Orange Park, FL
Posts: 1,420
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That looks sort of like the bolt on the end of the reverse lever inside the transmission.
The fill plug for the 5-speed is in the left-side differential cover, a standard Allen socket and not torx.
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-Chris
2004 Porsche Boxster 2.7 (gone  )
2004 Porsche 911 C4S Cab
1991 Porsche 911 C2 Targa 3.6
2017 Subaru Outback 3.6R
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11-08-2024, 10:15 PM
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#3
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Registered User
Join Date: Oct 2024
Location: San Jose, California
Posts: 51
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Quote:
Originally Posted by Deserion
That looks sort of like the bolt on the end of the reverse lever inside the transmission.
The fill plug for the 5-speed is in the left-side differential cover, a standard Allen socket and not torx.
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Oh dear...
Something tells me I might be in trouble here with a gallon of transmission fluid where it's not supposed to be? Any ideas on next steps? Or is this a have it towed to an indy shop?
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11-08-2024, 10:28 PM
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#4
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Registered User
Join Date: Oct 2024
Location: San Jose, California
Posts: 51
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Quote:
Originally Posted by Deserion
That looks sort of like the bolt on the end of the reverse lever inside the transmission.
The fill plug for the 5-speed is in the left-side differential cover, a standard Allen socket and not torx.
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Actually I wonder if I've just filled the crankcase from higher up...maybe draining it from the drain plug again and refilling from the correct hole is all I need to do?
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11-09-2024, 03:23 AM
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#5
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1998 Boxster Silver/Red
Join Date: Sep 2017
Location: 92262
Posts: 3,036
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You hope JFP will crawal from bed and point you proper.
Me? I'd be draining everything in that area hoping a gallon came out. I don't think you messed up badly.
Keep us posted. 
__________________
1998 Porsche Boxster
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11-09-2024, 06:42 AM
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#6
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Registered User
Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 6,483
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View is from the driver's side, the lower tray removed. 1 is the fill, 2 is the drain; one is a metric Allan head, the other is a metric triple square.
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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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11-09-2024, 07:12 AM
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#7
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Registered User
Join Date: Jun 2014
Location: LB, Germany
Posts: 1,507
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Quote:
Originally Posted by BoxsterInTheSun
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Looks more like a chain tensioner to me.
A normal filler plug looks different.
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My Porsche keyfob, instrument cluster and alarm ecu repair service: https://sportwagendoktor.de
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11-09-2024, 10:57 AM
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#8
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Registered User
Join Date: Oct 2024
Location: San Jose, California
Posts: 51
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Good news! I drained out the gallon of fluid I put in. Found the correct fill plug, and filled it with the correct amount of fluid. Put everything back together and it seems fine. Crisis averted hopefully. 🙂 Thanks as always for the amazing help! 🙏
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11-09-2024, 06:58 PM
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#9
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Registered User
Join Date: Apr 2023
Location: Oregon
Posts: 284
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Quote:
Originally Posted by JFP in PA
... the other is a metric triple square.
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I bought a whole set of triple squares for that very plug. I'll probably never have occasion to use them for anything else.
__________________
2000 986 base
Arctic Silver/black
2.7 liter
5-speed manual
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11-10-2024, 09:41 AM
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#10
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Registered User
Join Date: Dec 2009
Location: Orange County, CA
Posts: 1,919
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Quote:
Originally Posted by BoxsterInTheSun
Good news! I drained out the gallon of fluid I put in. Found the correct fill plug, and filled it with the correct amount of fluid. Put everything back together and it seems fine. Crisis averted hopefully. 🙂 Thanks as always for the amazing help! 🙏
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Out of curiosity, did you originally filles the differential with transmission fluid, then drain it out and put fresh differential (gear) oil? Good catch!
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11-10-2024, 09:57 AM
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#11
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Registered User
Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 6,483
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Quote:
Originally Posted by LoneWolfGal
I bought a whole set of triple squares for that very plug. I'll probably never have occasion to use them for anything else.
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Triple square fasteners show up is various places on different model years, but always a good tool to have around as several OEM's are using them here and there and you never know when you are going to find one in your way at midnight.............
__________________
“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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11-11-2024, 07:34 AM
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#12
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Registered User
Join Date: Jul 2024
Location: Western Europe
Posts: 108
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Quote:
Originally Posted by Gilles
Out of curiosity, did you originally filles the differential with transmission fluid, then drain it out and put fresh differential (gear) oil? Good catch!
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That makes sense, because the amount to fill that MT is not 1 gallon but .53 gallon (US) (2,25 L)
Last edited by 997_986; 11-11-2024 at 07:41 AM.
Reason: GB/US Gallon
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