I am not about to give up but this engine is really complex...
I have an oil leak on the bearing housing hotside of my turbo chargers. Stock K16s. This has been going on for some time.
Here are the exact symptoms and so here is what has been done.
1 - It starts to leak when the engine is turned on and it warms up. It comes when you rev the engine. Possibly a little extra when you switch it off. Not leaking anymore when the engine is switched off and the car is parked.
The car burns oil when driven hard. 30mins track, burned 1,5liter last time I was out (after 1st turbo rebuild, I HAD TO drive that race
Intermittent puff of smoke on start up. sometimes nothing, sometime a little, doesn't seem to matter how long the car has been sitting. It's not smoking for ages like some have had.
2 - The car has the check valves from FVD. It has the return lines from RUF.
3 - The oil pump works correctly. No oil lines or vent line are plugged or malfunctioning, correct flow in the return lines. Tried stock and the RUF ones with no changes.
4 - There is no oil in the intercooler/throttle body.
There is no oil in the exhaust collector.
Prior to this leak i drove the car a whole track season with NO oil consumption what so ever despite running pretty hard.
5 - Leak down done max 2/3% (recently rebuild engine). Leak down done at 2 separate shops with similar good results.
6 - Oil is Motul 10W50
7 - Small oil filter is 993 107 203 04 i.e. the latest updated filter (in Europe). The filter has been swapped a few times across the whole search process with no changes.
8 - I have had the turbos refurbished - It made no change
9 - I borrowed turbos K16s from another 993TT, 120000kms on them. Miracle... NO LEAK
10 - From there I ordered brand NEW K16s.
Guess what they leak... In the same way
Any suggestions from here, I already tried to steal the old borrowed turbos so that's not a credible solution (yet!), would be highly appreciated.
A very good bottle of wine
will be sent to the one who actually helps diagnos this correctly !
Thx a lot in advance chaps !
The car is worth fighting for, such a blast when it goes but damn I have had my shares of trouble with it.
100% track car by the way.