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Old 06-07-2014, 10:08 AM
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Join Date: Jan 2014
Location: South Florida
Posts: 28
722.120 Transmission Drain Plug Crush Washers

I'm trying to figure out how many crush washers are supposed to be used on my tranny drain plug. I have a '79 300SD W116. It has the style drain plug (hollow bolt) that goes through the dipstick tube. When i removed it from the car there were two crush washers. One above the dipstick tube and one below it with the hollow bolt going through it all.

I looked it up on EPC. It only shows one washer P/N: 007603014104

It appears to be the correct drawing but when I click on the dipstick for a part # it says it's not valid for this model.

I added 4 qts of tranny fluid to the car while checking for leaks every few minutes. It didn't leak. Checked it the next day. Small puddle of ATF under car. Definitely leaking at the crush washer seals.

I torqued it to 10ft-lbs. I believe this is the correct torque for this bolt.

Anyone have the same problem? One crush washer or two? Copper or Aluminum?


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Old 06-07-2014, 10:44 AM
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Join Date: Jun 2004
Location: West of Ft. Worth. TX
Posts: 4,164
Every place I've seen with the hollow bolts, there is a crush washer on each side of the banjo bolt. Copper washers seem to work best for me and they are available at nearly any auto parts store, known as "brake system washers".

(I've heard, from here on the forum, that crush washers are reusable when heated with a propane torch. I personally haven't tried this)

Double check that torque. It sounds kind of low to me. 20 Nm = 14 ft/lb

84 300SD 350K+ miles ( Blue Belle )

Last edited by SD Blue; 06-07-2014 at 11:22 AM.
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Old 06-20-2014, 08:22 PM
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Join Date: Jan 2014
Location: South Florida
Posts: 28
Thanks. I've been away for work the last couple weeks. Hopefully there won't be 4 quarts of transmission fluid under the car when I get back home.

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Old 06-21-2014, 03:15 AM
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Join Date: Jul 2008
Posts: 3,740
I would climb under the car and look above the plug at the kick down solenoid and see if that is where your leak is coming from and just looking like it is the crush washer. I have a hard time believing you can lose that much fluid from crush washers being bad..

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