So my first probably serious problem with my GP t-jet from 2008. (Due to lack of serious problems so far, not a frequent active visitor in this section ).

Two weeks ago the car has been at the dealer for a service, one of the things done was brake fluid change (never touched from new before, the car is at 105k km at the moment). Now it seems there is a leak - something drips very slowly (very hard to catch, but there are very visible stains under the car) from the connection between the engine block and gear box bell housing. I used a usb endoscope to peek through the inspection hole in front of the gearbox, but honestly the equipment is so crappy I cannot make any solid judgement from this. I am almost convinced it is the clutch slave cylinder that leaks, but the weirdest thing is that I cannot really notice any drop of the fluid in the reservoir, and by now (I have been observing this for a week) there should be some. Also, the black paint from the protection shield between the box and the block where it leaks peeled of, and that indicates to me it is the brake fluid.

Any ideas or experiences? Could this nevertheless be a coolant leak from some mysterious place (I inspected the vicinity of the thermostat housing, but without taking the engine cover, so that was very limited...). I am right in thinking that replacing the cylinder in case of the c510 box means box out first? Anything else I missed here that I should check?

Check your gear box oil is ok just in case the seal as gone on the input shaft as the bearing goes and buggers the seal or keep a check on your engine oil in case your crankshaft seal is leaking as both will allow oil to drop from were you say

Did the 'leak' start after the service or was it present before?..if after then id go back to the garage and ask them to check their work...

I think it started after the service, but cannot be 100% certain, I do watch my car over, but not every day. Even if it manifested itself after the brake fluid change (due to pressurising the system with the fluid change equipment), I guess it was bound to happen anyhow. Assuming this is the brake fluid going through the cylinder seal, which after reading up a bit I think it is. Gearbox oil is thick and has a characteristic smell, this one is clear, rather thin, and without any particular smell I'd recognise. Engine oil would be also recognisable I guess.

I will of course go back to them, nevertheless I am probably looking at gearbox out job and I wonder if it is worth just biting the bullet and ask them to change the clutch over too, and be done with the whole area for the next 100k kms. A while back I'd attempt the whole thing myself, but currently have very limited conditions and time for that.

So actually I started to prepare myself mentally to do it myself, if it comes to it. I think I have found most of the information I need, still one thing that bothers me is the driveshaft removal from the box. On the left side I am sure that it has a locking circ clip and I will have to wiggle it out (I prefer not to do it by removing the tripod connection). Is there a locking clip also on the right side?

Anything else I should know before I attempt this?

So now it is certain - it is a clutch cylinder leak. I committed myself to do it on my driveway. Doing my strut mounts today I examined everything for potential problems. Two worries still on my list:

1. I saw people drop the exhaust to get the gearbox out. Is the only reason the access to the back mount bolt with a rachet (the one with the torx head)?

2. Still not sure what is the easiest way to extract the short drive shaft from the box. Crowbar?

Both drives have a circlip on the end, Why are you taking them out?

On a tjet C510 box? Are you sure? I have it from a good source that only the short one is an issue. Out because this is a much cleaner way to get the box out, hate messing up with the gaitors or what they are called.

when did the leak start?