Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help

Go Back   PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Diesel Discussion

LinkBack Thread Tools Display Modes
Old 10-04-2008, 11:12 PM
Diesel Dan's Avatar
Registered User
Join Date: May 2006
Location: Austin, TX
Posts: 264
Angry Torque converter drain plug stripped!

Why in God's name did they make that thing a tiny little 5mm allen screw?! Anyway, I'm going to try the hammer and chisel method next, but wanted to ask a question first. I PM'd someone about this who thought the plug thread might be a reverse thread. Can anyone verify whether or not the thread is reversed? I was trying to get it off counter-clockwise as though it was a normal thread.

Another question: If I decide to blow off the TC draining, is it okay if I mix standard Dex/Merc V fluid with a synthetic fluid like Mobil 1. I think the fluid I have in there now is Valvoline Max Life, which is compatible with Dex/Merc V. And the fluid I bought to refill with is Mobil 1 synthetic.

1987 Mercedes 300D ~200K (Greasecar & Biodiesel)
1993 Ford F-250 7.3 IDI diesel 165K (Biodiesel)
1996 Thomas/International Bus with DT466 engine
Reply With Quote
Old 10-04-2008, 11:15 PM
babymog's Avatar
Loose Cannon - No Balls
Join Date: Jan 2006
Location: Northeast Indiana
Posts: 10,767
The fluids are compatible.

The plug is a normal right-hand thread.

Gone to the dark side

- Jeff
Reply With Quote
Old 10-05-2008, 12:02 AM
sixto's Avatar
smoke gets in your eyes
Join Date: Jun 2000
Location: SF Bay Area
Posts: 20,807
CAVEAT - I've done this successfully on GM, Mopar and Toyota transmissions. I don't know if it works on MB transmissions.

If you can't get the TC plug out or if there is a risk of not being able to get it back in place, flush the fluid with the engine idling. Disconnect the transmission cooler return line at the radiator, start the engine, pour fresh fluid through the dipstick tube as dirty fluid is purged from the cooler line. Keep going until clean fluid comes through. Do this after replacing the filter.

87 300D

Last edited by sixto; 10-05-2008 at 12:09 AM.
Reply With Quote
Old 10-05-2008, 12:24 AM
Diesel Dan's Avatar
Registered User
Join Date: May 2006
Location: Austin, TX
Posts: 264
Thanks for the ideas. I just installed the new filter and put the pan back on. I'm going to take a break from this for a while and mull it over. My filter was crusted with crap, the pan had sludge and lots of particles, the fluid was dark and murky. Not good. I'd really like to get that nasty fluid out of the torque converter. I may go so far as to drill out the screw and replace it with one that has a hex head instead of that ridiculous 5mm allen head.
1987 Mercedes 300D ~200K (Greasecar & Biodiesel)
1993 Ford F-250 7.3 IDI diesel 165K (Biodiesel)
1996 Thomas/International Bus with DT466 engine
Reply With Quote
Old 10-05-2008, 01:20 AM
Registered User
Join Date: Feb 2008
Location: DFW area (north side)
Posts: 1,288
I've had great luck using left hand drill bits. The damaged item using comes out before I get a hole big enough to insert an extractor.

A RH bit may just make it tighter or drop it on the other side.
1983 300D, bought new, 215k+ miles, donated to Purple Hearts veterans charity but I have parts for sale:

Last edited by Cr from Texas; 10-05-2008 at 01:20 AM. Reason: typo
Reply With Quote
Old 10-05-2008, 03:30 AM
Diesel911's Avatar
Registered User
Join Date: Sep 2007
Location: Long Beach,CA
Posts: 37,324
Is there room to try one of those external type Ez-outs? I believe at leat 2 Members have said the used them on Allen Head bolts.
I bought a set but have not had a chance to try them on anything yet.
84 300D, 82 Volvo 244Gl Diesel
Reply With Quote
Old 10-05-2008, 03:32 AM
pawoSD's Avatar
Join Date: Oct 2004
Location: Grand Rapids, MI
Posts: 15,368
I stripped a drain plug on the transmission pan of our project SD, so I grabbed the edges with vice grips and turned, broke it loose easily. Not sure if that tool would fit into the space by the torque converter....
-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 94k - mine - (OC-97,400)
'17 Metris(VITO!) - 19k - wifes (OC-25k)
'01 E320 Wagon - 161k - mine (OC-165,000)
'07 E350 Wagon - 138k - dad's (OC-139,500)
'01 SL500 - 84k(km) - dad's (OC-94,000km)
'16 E400 4matic Sedan - 93k - Brothers (OC-98,500)
Reply With Quote
Old 10-05-2008, 11:12 AM
wbain5280's Avatar
Registered User
Join Date: May 2001
Location: Northern Va.
Posts: 3,386
You can try a Torx bit on the drain plug. Get a set so you can try different sizes. Get a new drain plug first and then have a go at it.



Currently 1965 220Sb, 2002 FORD Crown Vic Police Interceptor

Had 1965 220SEb, 1967 230S, 280SE 4.5, 300SE (W126), 420SEL


Not part of the in-crowd since 1952.
Reply With Quote


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On

All times are GMT -4. The time now is 09:22 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2021, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page