Fixing 1981 to 1984 Turbo Diesel Auto Transmission Pesky Leaks - On Demand Video

Applies to W123 and W126 turbo 300D, 300CD, 300TD and 300SD

These transmissions are now 40+ years old, and with age comes hardened o-rings and seals, leading to what I call "pesky" leaks. They are not bad enough to flow on the ground, but they do leave wetness around the transmission and drips on the garage floor. In this 27-minute instructional video, Kent will walk you through the steps of fixing these leaks.  Be forwarned it may be easiler to just remove the transmission to fix these on the bench. A couple can be readily fixed with the transmission in the car. Others require dropping the transmission down, and in the case of the bowden cable it is an advanced DIY job to try to change the o-ring with the transmission dropped down. Watch the YouTube video below for more detail.

Fixing 1981 to 1984 Turbo Diesel Auto Transmission Pesky Leaks - On Demand Video

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On Demand Video

Product Details

Watch this video for a full description of the leaks in question

The fluid leaks covered include the following:

  • Base of transmission oil filler tube o-ring
  • Bowden cable to transmission housing o-ring
  • Transmission modulator o-ring
  • Transmission cooler lines banjo bolt sealing rings (aluminum)

This video is included free with the purcase of Kent's pesky leak kit with special tool. 

PLEASE NOTE: Front input shaft seal leaks are NOT overed in this video. PDF instructions are available free with the purchase of this separate leak fix kit below. If you need instructions on how to remove the transmission Kent has written a detail manual. See related products below.

How to view this on-demand video:

Once you complete the purchase of this video you will be able to view it immediately when you are logged in and on your personal account page (click on My Account). The video(s) will show up under My Video Manuals. The video is NOT downloadable to your computer or mobile device, but you will be able to view it anytime, from anywhere and from any device as long as you have internet access and you are logged in to your account at

Important note: This video manual may or may not include all the information you will need to troubleshoot and/or repair your specific problem/s. Please read the full description carefully to determine if this video is applicable to your year and model and contains the information you are looking for. If not, please refer back to our "Solutions Finder" and enter your chassis number and the specific problem you are having to see if we offer a solution.

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