w124 transmission cooler line puncture

[ou2mame]

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?

[Sugar Bear]

A flared union would be better than rubber hose. A piece of hose cut longitudinally and clamped onto and precisely over the leak with the cut opposite the leak would be better than just a section of hose as it can't just slide off.

Good luck!!!

[ykobayashi]

I’ve had good results brazing using a Bernzomatic TS8000 Mappro torch kit from Home Depot. I get the brass filler wire from Walmart in the craft section where they sell stuff to make bead bracelets. For flux I use 20 Mule Team Borax from the laundry soap department also at Walmart. Works great on stainless steel.

[Diesel911]

If it is on a straight section of the tubing, you can do as is in this tread: Look what my PO did with the transmission cooler line

I did the same thing on my W123. Make sure you use transmission cooler hose.

You have transmission hoses from the factory so using hose in another area should not be an issue.

[Diesel911]

Originally Posted by ykobayashi

I’ve had good results brazing using a Bernzomatic TS8000 Mappro torch kit from Home Depot. I get the brass filler wire from Walmart in the craft section where they sell stuff to make bead bracelets. For flux I use 20 Mule Team Borax from the laundry soap department also at Walmart. Works great on stainless steel.

I think I might be able to use that on some other things in the future.

Is it the same method I have seen on regular brazing where you heat the rod and stick it in the flux, so the flux adheres to the rod?

[Phillytwotank]

Did you say if it’s in the left side or right side? I have a left side hose/line that I’m not using.

[ykobayashi]

Originally Posted by Diesel911

Is it the same method I have seen on regular brazing where you heat the rod and stick it in the flux, so the flux adheres to the rod?

Sorry for the late reply. Missed this.

Yes. I just make my own by lightly heating the yellow brass wire with a torch and dipping it in the borax. It works amazingly well and it is stupid simple. Cheap equipment and supplies too.

The way I did the stainless steel wires I show above is I heated the wires lightly then dipped them in the borax powder. It looks like rock candy when you’re fluxed.

ETA- I learned from this video. I don’t use his expensive rod or flux though. Just $4 20 mule team laundry booster and yellow brass wire from the craft section at Walmart.

https://youtu.be/hEx89N3f9u4

[Diesel911]

Originally Posted by ykobayashi

Sorry for the late reply. Missed this.

Yes. I just make my own by lightly heating the yellow brass wire with a torch and dipping it in the borax. It works amazingly well and it is stupid simple. Cheap equipment and supplies too.

The way I did the stainless steel wires I show above is I heated the wires lightly then dipped them in the borax powder. It looks like rock candy when you’re fluxed.

ETA- I learned from this video. I don’t use his expensive rod or flux though. Just $4 20 mule team laundry booster and yellow brass wire from the craft section at Walmart.

https://youtu.be/hEx89N3f9u4

I was just curious if you used the same method I have seen. Borax has been as brazing flux before I was born. When I worked in a welding shop when in in 1968 that is what was used when brazing. Although they seldom brazed things.