I've got an 87 300d and it has a transmission leak. I didn't notice it at first because my injector pump was leaking out diesel cleaning all the other leaks lol.. so now that I fixed that I'm starting to find all the other leaks. I noticed a drip drip drip of tranny fluid and found that the passenger side hard line is leaking in the middle, where it connects to the bellhousing in the clamp. I was researching that this line isn't made anymore? I can't find a good parts diagram to find the part number for that line to try and find one. Otherwise, any tips on fixing it? I assume my only option is to take it off, cut out the bad section and replace it with a rubber hose and hope the clamps hold?

Several options to consider.
On the car, you could try repairing with epoxy like JB Weld, or a suitable rubber hose slipped over the leak and clamped.

Off the car, you could have the line hole brazed shut, or a coupling/union installed, or a rubber hose repair as you indicated.

I would opt starting with the easier approach and monitoring. I had a oil cooler line with a nail size hole in it patched with epoxy that has held firm for over 15 years.

Good luck

I have a pair of the hard lines maybe PM me if you'd like them.

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92 e300d2.5t
01 e320
05 cdi
85 chev c10

This is a picture from another member's thread. I did the same thing.

I cut out the section where the line had worn through with a tubing cutter and I uses like a 5-6-inch-long piece of transmission oil cooler hose, and I slide both ends of the tube inside till the tube ends met near the middle of the hose. I put one hose clamp about 1/2 inch from where they 2 hoses met on each side and a clamp on each father end of the hose.

If you think the hose is a weak point, remember that you have rubber hose between the radiator and the steel tubing.

Attached Thumbnails

 

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84 300D, 82 Volvo 244Gl Diesel

If you have a punctured transmission cooler line on your Mercedes-Benz W124, it is important to take action quickly to prevent further damage to your transmission. Here are some steps you can take:

Turn off the engine immediately to prevent the transmission from running dry and causing damage.

Assess the damage and determine the severity of the puncture. If the hole is small, you may be able to patch it temporarily with a high-pressure rubber hose and hose clamps until you can get it properly repaired.

If the puncture is severe or if you are unable to patch it, have your vehicle towed to a reputable mechanic or transmission specialist. They will be able to properly repair or replace the damaged transmission cooler line.

Once the transmission cooler line is repaired, be sure to check the transmission fluid level and condition to ensure that the transmission has not been damaged.

Finally, it is a good idea to have your transmission inspected by a qualified technician to ensure that it is functioning properly and has not sustained any damage as a result of the puncture.

In any case, it is important to act quickly and get the necessary repairs done as soon as possible to prevent further damage to your transmission

I got this,..