mat59

Anyone know what’s going on here? Have a small leak. Images below. Taken on right side (passengers side).





Thanks!

Macster

Not the best views but if I had to guess I'd have to say axle flange seals. The ones in my 2003 Turbo's front diff developed leaks at somewhere around 100K miles. Tech replaced then and topped up the diff fluid level -- which fortunately wasn't real low -- and the new seals have been fluid tight ever since. Diff's ok too.

garrett376

Is that CHF, or trans oil? I'd bet your clutch slave is leaking.

Kevinmacd

Looks to me the shift select seal is leaking, need to take the trans off and dismantle to fix it! The upper area where the select lever goes into the trans!

danspach

Yeah, I have several very similar looking pictures from when I did my slave/accumulator.

Gear oil has a very distinctive smell and quite different from the Pentosin found in the clutch slave circuit. Swipe that drop off the trans and have a whiff. If it makes you go “whoa!”, then its gear oil. If not, Pentosin.

I’d bet it’s Pentosin and either your slave or accumulator is leaking.

911mhawk

Yep, look leak above

jpflip

If you look at the second picture the leak seems to come from higher up and if you look at the picture of the engine on the bench , the slave can be the problem....

Kevinmacd

Best thing to do is clean it all up thoroughly and keep an eye on it, to pinpoint the leak.

mat59

OP here. It was the rear differential seal in the end.

mat59

Kevinmacd

Sorry to hear it, thats what I thought! Good luck! Since it will have to be opened, maybe a second gear synchro replace or inspection, and pinion bearing inspection. Might be a good time!

32krazy!

997gt2 1-3 gear all steel syncros 1-6 gt3 shift selector send it to rader transmission cost is under 7k$ if you pull it and ship it. Add a wavetrac while your in there

mat59

mat59

OP here - I'm updating this thread as it may be of use to others (I have a parallel one running on RennTech and both have been really helpful!). To recap, having originally thought the leak was from the axle seal, I had this replaced. It then continued to leak from a nearby area, which turned out to be the gear selector seal, which it would appear was due to the 'box being overfilled. However, I now have another leak from the same area! I've been under the car today and it's either the axle seal (again), or the clutch slave. I'm thinking clutch slave as there seemed to be a little fluid above the axle seal towards the top of the gearbox - hard to be sure as the fluid had mixed with some dust (I'm in Dubai...). Moreover, the reservoir in the frunk (green lid) is low. So, now I'm thinking I need a new slave cylinder!?

my04996tt

Check the top of tranny with a white cloth, if it's green in color its the slave or accumulator.