C320cdi w203 v6 turbo replacements

[Tobyjon89]

Hi all

This is my 1st post on here and sp sorry if this has been asked before.
I am replacing the turbo on my car has anyone done this on one of these is there a guide anywhere. I'm having problems getting to a few of the bolt and I'm trying to find out how other people have done this.
Cheers all

 

[Martyn_n]

If you do a search for 642 oil cooler seal replacement one of the steps in that is to remove the turbo. Plenty of guides available on here and on youtube.

 

[Jobsworth]

Access to the exhaust bolts is much easier with the false bulkhead removed. It has a water pipe passing through it that goes to the heater that you need to remove.

 

[Tuercas viejas]

Before buying!
Ensure your new turbo has an impellor make from a solid billet NOT an extrusion.
The original formed by extrusion is dull in colour, will have a flat shaved off of it and visually a distinct fine seam running along the hub section .
Being prone to sudden disintegration, the updated version (released about 2 to 3 years ago now) is made from solid billet by 5 or 6 axis machine tools, has a bright finish , no extrusion seam, and an "S' suffix on the numeration found on the induction side snail housing.
Tuercas viejas

 

[m80]

V6 CDI Inlet Port Shut Off Motor Replacement

In preparation I think it’s worth dropping the belly pans. The 1st time you drop a bolt or socket the pans have to be dropped anyway, this way now you just pull out the belly pan to recover the dropsy. Then put the belly pan back to catch the next. When feasible I prefer to remove the item and...

forums.mercedesclub.org.uk

The part 2 photo's might help.

 

[Tobyjon89]

Cheers all turbo is out. Next job remove inlet manifolds to change oil cooler seals

 

[m80]

Cheers all turbo is out. Next job remove inlet manifolds to change oil cooler seals

I haven't done that but didn't realise the manifolds had to come off to get to it.

If you're removing the manifolds, the swirl flaps have been known to disintegrate. Some have removed, blanked and disabled the swirl motor (just a resistor for that bit).
Worth a bit of research.

 

[Tobyjon89]

Yeh oil cooler sits right in the middle of the v so easiest way is inlets off. That was the plan to remove swirl flaps while I have them off.

 

[Tobyjon89]

Before buying!
Ensure your new turbo has an impellor make from a solid billet NOT an extrusion.
The original formed by extrusion is dull in colour, will have a flat shaved off of it and visually a distinct fine seam running along the hub section .
Being prone to sudden disintegration, the updated version (released about 2 to 3 years ago now) is made from solid billet by 5 or 6 axis machine tools, has a bright finish , no extrusion seam, and an "S' suffix on the numeration found on the induction side snail housing.
Tuercas viejas

Already have a new turbo. Got it from turbo dynamics. Didn't get a garret got the melett. They said there just as good as garret

 

[Tuercas viejas]

Already have a new turbo. Got it from turbo dynamics. Didn't get a garret got the melett. They said there just as good as garret

Well that's up to conjecture , but check the impellor nonetheless & if you are DIYing it, do flood snail housing through the oil feed port with oil BEFORE install.
I usually sit the turbo in a vice lightly clamped & fill the housing turning the shaft so that oil floods the internal free floating bushes etc
Tuercas Viejas

 

[Tobyjon89]

So after a lot of shouting, swearing, threatening the car that I will set it on fire. Iv finally got the turbo off and the inlets off. Oiler cooler seals leaking like mad so will be replacing them and I im going to remove swirl flaps and get holes welded close.