I have a leak coming from the transmission of my 2003 C240 where it attaches to the tube that goes to the radiator. I've attached a photo. Does anyone have a diagram or parts numbers for what I might need? I'm assuming it's just an o-ring or gasket. Also, will it dump all the ATF or should a quick parts swap be pretty easy?
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washer on that bonjo bolt may be leaking trans fluid. Not all the trans fluid will come out when you remove that bolt; only the fluid that is in that line (and possibly some of the fluid in the radiator) will leak out. Just to be safe, have 2 qts of MB trans fluid ready before you open that bonjo bolt. Take a look at the picture below... part # 90.
If the trans filter and fluid hasn't been replaced before, use this opportunity to replace the trans filter and fluid.
I think you're right and it is a washer. It was finger tight, but I didn't check with a wrench since I don't know the torque spec. I think it is leaking at the washer junction. When I put a clean paper towel on it, I can see a little seepage.
I'm certainly new to Merc's so I could easily be wrong, but I've never seen torque values for banjo bolts. If it's only finger tight, that's probably your problem. I would put a wrench on it and keep in mind that I'm tightening into an aluminum casting. It doesn't have to be really tight, just very snug. I expect that will solve the problem. In the mean time, you can get some more washers - usually they're copper or aluminum so they'll crush a little.
Mercedes Benz World Owner's Gun Club, Member #91
2005 C230K (Diamond Black Metallic)
2006 C230 (Iridium Silver)
1974 Lotus Europa (White)
Mine is also leaking I tightened it a little bit and will have to check it when i get the transfluid flushed in the near future.
Trey's Car History
87 Suzuki Samurai Gone :(
99 KIA Sportage 2Door Sold July 20 2009
97 J30 given when 16 Has been passed down to sibling
01 C320 Got at 16 as of 9-10-13 has 200,500 miles with Eurocharged Tune, AMG Style Trunk Spoiler, BIX, NAV 2.0, Tein Springs with Front Renntech Shocks and Koni's in the Rear
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I picked up some washers from Mercedes of Austin this morning. If anyone is interested, they have updated the part number and it is now:
The washers are a little larger than the ones I took off the car. Changing the part was easy and resulted in minimal fluid loss (perhaps 2-3 tablespoons worth). The original washers looks a little oblong, so perhaps there was a manufacturing defect or a mechanic was a bit rough on them in the past.
Here is a picture of the old washers (foreground) and the new (background):
However, I'm a little concerned that there is a little oil seepage in another area. Please see this photo:
This is the area to the front of the transmission. If it is leaking, it will be quite a job. Anyone else have this issue? What amount of seepage is normal? None?
I didn't change it and the level is good. However it was changed about 10k miles ago when I was living in the SF Bay Area. It was done by a independent Mercedes shop. That said, now that I think about it, the fluid in there isn't red like the MB stuff I just picked up. Uh oh...
I hope there isn't seal compatibility issues with the stuff the shop used. I suppose a complete flush might be in order.
Any chance you know if that area in my picture is prone to leakage?
that looks like the bell housing... inside that bell housing, the torque converter access port is located. It's possible that when the trans fluid was changed, they may have drained the torque converter and some of the fluid may have spilled inside the bell housing. That fluid may be leaking out.
Guys, I have a few more rookie question. Is it OK to check the ATF level with the car running AND air filter box removed. All the directions I find online seem to say that you should check the level with the engine running.
I've been checking the level after I drive the car to warm up the fluid, but with the car off. I also seem to only get one reading before the dipstick brings some fluid into the tube and makes all subsequent measurements look high. Is there a trick to doing it?
Trans fluid should be checked [with car on a flat/level surface] while the engine is running. To measure the fluid level precisely, the trans temp should be around 85 deg. cel. You can measure the trans temp with the use of contactless IR thermometer (available at HarborFreight store for around $20). Or, you can drive the car for about 15 to 20 minutes, and park the car on a level surface and measure the trans fluid level with the measuring tool.
About running the engine without the airfilter, it should be ok to run the engine for few minutes without the filter... as long as the car is not in a dusty area.
It seems that the seepage around the bell housing has gotten a little worse in the last 8 months or so. I can't quite figure out where it's exactly coming from but it seems like it it's coming from the passenger side of the housing.
I changed the valve cover gaskets and resealed the recirculating covers last winter so I'm pretty confident it's not coming from that area.
....It seems that the seepage around the bell housing has gotten a little worse in the last 8 months or so. I can't quite figure out where it's exactly coming from but it seems like it it's coming from the passenger side of the housing....
I assume you've ruled out the "tranmission bushing" aka 'plug' that carries the wiring inside the trans? You could have a rear main leak/weep. How much does it leak? Do you wipe off the oil and check for buildup? Do you add oil between changes? Does the leak ever overflow from the underside cover and on to the floor after you clean it off?
Yes, the transmission plug was replaced 4 years ago or so and it looks dry. I'm pretty sure this is engine oil since it doesn't have the ATF color. It's not a ton of leakage since the oil doesn't need topping off.
Only a few drops in the underside cover, but there is evidence that more oil is being blown further towards the back of the car. So, I assume that the leak is happening mostly during driving while hot and the majority ends picked up by passing air and sprayed around the underside of the car.