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Old 05-16-2017, 11:13 PM   #1
bmw-slangen
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Default Getrag 260 is leaking - but why?

I have a very strange gearbox leakage and really need expertise help!

It is a E30 323i -85 with a standard manual Getrag 260/5 gearbox.

When I drive hard on the track, it starts leaking quite badly from inside the bellhousing.

But when driving "normal" it doesn't leak at all.


I'm really hoping that someone else recognize this problem and can help me!




--- Here is some more in-depth but important details ---

I can drive "normal" without any issues.
The problem occurs when driving hard on the track.
The first stint (20 min of hard driving) is usually not a problem.
Halfway through the second stint (usually you rest for 20 min between stints), it starts to leak really bad.

I tried with the original gearbox two times and then I also tried with a spare gearbox - same result.

It is 100% confirmed it is gearbox oil and not engine oil or brake fluid.
It is 100% confirmed it is coming from within the bellhousing.

I verified the vent hole is not clogged (goes for both gearboxes).

I use ordinary ATF "Dexron III" transmission oil (goes for both gearboxes).

I verified the fill level is according to specifications (goes for both gearboxes).
Means that I fill up to the fill plug level with the car level.

On all occasions it's been basically bone dry around the vent hole (so nothing comes out from that one).

On the original gearbox I
- replaced the input shaft seal TWICE (part #9)
- replaced the sealant of the housing cover and the screws TWICE (part #6 and #7)
- made sure every time that the housing cover was oriented properly to the oil passage
http://www.realoem.com/bmw/enUS/show...diagId=23_0579

On the spare gearbox I
- replaced the input shaft seal (part #9)
- replaced the sealant of the housing cover and the screws (part #6 and #7)
- made sure that the housing cover was oriented properly to the oil passage
http://www.realoem.com/bmw/enUS/show...diagId=23_0579

On the spare gearbox I
- sealed (from the outside using RTV) around the layshaft bearing visible in the bellhousing (part #24, #21 and #22)
http://www.realoem.com/bmw/enUS/show...diagId=23_0144

I pressure tested (around 1 bar) the spare gearbox and nothing...
Not the slighest indication of a leak (checked by listening as well with soapy water)...

Last edited by bmw-slangen : 05-18-2017 at 03:56 PM.
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Old 05-17-2017, 06:47 AM   #2
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wow, that's crazy. maybe the fluid is just expanding so much from the heat of hard driving?

pressure test with a higher pressure. it sounds like its coming from where you rtv'd
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Old 05-17-2017, 07:46 AM   #3
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Two gear boxes and same issue. Likely isn't the gear box. On normal driving, the leak probably is just burning off.

Your m20 is known to leak on the back of the head from the valve cover gasket so I would start there. Could be rear main seal. Could be back of the head gasket. But that's all in order of most likely to least.
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