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
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
On the spare gearbox I
- sealed (from the outside using RTV) around the layshaft bearing visible in the bellhousing (part #24, #21 and #22)
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)...
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
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
On the spare gearbox I
- sealed (from the outside using RTV) around the layshaft bearing visible in the bellhousing (part #24, #21 and #22)
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)...
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