jimmy
MB Enthusiast
- Joined
- Aug 8, 2002
- Messages
- 2,316
- Location
- Northamptonshire
- Car
- Discovery 3 TDV6, Discovery 300TDi - Plaything!
WARNING DIRTY PICTURES!
After all the talk of MAS problems, I thought I would take a look at mine:
As you can see, there is not much to it. Looks like a diode/resistor type thing. You can see in the picture that mine is very oily, so I thought I would see where the oil was coming from.
This is a picture of the inlet pipe at the top of the engine after the intercooler but before the turbo wastegate. It is lined with a very thick, gundgy oily mess!! This is when I decided to strip the whole of the inlet side of the engine and thoroughly clean everything.
I removed the inlet manifold and all the associated inlet pipes from the turbo, intercooler and manifold. When I removed the bottom pipes that join onto the intercooler, about 1/2 litre of thick oil drained out. I used a spray gun to 'blow' brake cleaner through the intercooler until it was clean.
The inlet manifold is easy to remove and was also full of gundge.
Picture of the stripped engine:
I used lots of petrol and brake cleaner to thoroughly clean all the pipework until it was completely clean. I then reassembled everything in reverse order (Haynes terminolgy
) And amazingly it started first time and runs an ablsolute treat.
Obviously the oil in the intercooler was reducing it's efficiency and the gundge would have been restricting airflow and the dirty MAS might not have been working properly. The result is much smoother, faster throttle response. Since I fitted the tuning box I have noticed an increase in black smoke under very hard acceleration, today I have nearly cured it and there is hardly any smoke from the exhaust.
I am not sure where the oil has come from, the engine never uses any and I have never topped it up. The turbo was spotlessly clean so hopefully no problems there. The only thing I can think is that it is just a build up from the last 70K miles, the crankcase breather is plumbed into the inlet pipe just after the air filter box, so all the oily fumes are getting drawn into the inlet pipes.
Either that or the engine oil has been overfilled at sometime or I have a more serious problem that is not obvious to me. I shall keep an eye on it an re-check the pipes in a few thousand miles.
Amazing that it could be in such a state, especially with a full MB service history!!!
After all the talk of MAS problems, I thought I would take a look at mine:
As you can see, there is not much to it. Looks like a diode/resistor type thing. You can see in the picture that mine is very oily, so I thought I would see where the oil was coming from.
This is a picture of the inlet pipe at the top of the engine after the intercooler but before the turbo wastegate. It is lined with a very thick, gundgy oily mess!! This is when I decided to strip the whole of the inlet side of the engine and thoroughly clean everything.
I removed the inlet manifold and all the associated inlet pipes from the turbo, intercooler and manifold. When I removed the bottom pipes that join onto the intercooler, about 1/2 litre of thick oil drained out. I used a spray gun to 'blow' brake cleaner through the intercooler until it was clean.
The inlet manifold is easy to remove and was also full of gundge.
Picture of the stripped engine:
I used lots of petrol and brake cleaner to thoroughly clean all the pipework until it was completely clean. I then reassembled everything in reverse order (Haynes terminolgy
) And amazingly it started first time and runs an ablsolute treat.Obviously the oil in the intercooler was reducing it's efficiency and the gundge would have been restricting airflow and the dirty MAS might not have been working properly. The result is much smoother, faster throttle response. Since I fitted the tuning box I have noticed an increase in black smoke under very hard acceleration, today I have nearly cured it and there is hardly any smoke from the exhaust.
I am not sure where the oil has come from, the engine never uses any and I have never topped it up. The turbo was spotlessly clean so hopefully no problems there. The only thing I can think is that it is just a build up from the last 70K miles, the crankcase breather is plumbed into the inlet pipe just after the air filter box, so all the oily fumes are getting drawn into the inlet pipes.
Either that or the engine oil has been overfilled at sometime or I have a more serious problem that is not obvious to me. I shall keep an eye on it an re-check the pipes in a few thousand miles.
Amazing that it could be in such a state, especially with a full MB service history!!!
Maybe a chat with the friendly local stealer service dept (do you have one that's friendly?) might throw up more ideas as to why the oil and gunge was there in the first place, given it has a full MBSH. 
As you say, you'd expect it to be cleaner that it was if not spotless.
