This Thread Originally authored by gsxr... I am posting here as a new thread to make it easier to find the pertinent information that has been assembled in the old circa 2008 thread... without further ado ... this is what I had posted in that thread... > NOTE > Links are now working

In the spirit of helpfulness... and organization I am including here a summary listing providing the key references to the conversion... I hope this is of help.

Here is the part number and location to purchase the replacement actuator

part number 433489-12

http://www.atpturbo.com/mm5/merchant.mvc?Screen=PROD&Store_Code=TP&Product_Code=433489-12&Category_Code=

# please note that the rod length will have to be shortened

as a reference this thread :
A : ( post number 133 ) explains the rod length customisation
B: I would highly recommend perusing the entire thread of which the page 9 URL is listed here :
Wastegate actuator swap for OM602.962?

and

for detailed pictures of the parts involved : ( wastegate13.jpg ) for actuator image )
http://www.w124performance.com/images/OM602_intake/


also,

in this same thread : page 10

Wastegate actuator swap for OM602.962?

it is outlined that for the manifold port fitting one should purchase this :

http://www.atpturbo.com/mm5/merchant.mvc?Screen=PROD&Store_Code=TP&Product_Code=ATP-FTG-040&Category_Code=

! please note that this fitting is a NPT thread and will certainly work for the self tapped hole on the turbo housing that GSXR implemented but I have yet to confirm that the OE manifold threads used by : VegStew in post # 117... here :
Wastegate actuator swap for OM602.962?

are in fact a match for the 1/8" NPT thread. I will write again when I have confirmed this.

UPDATE > as referenced in the original thread... the factory manifold threads are in fact 1/8 NPT and and will mate exactly to the fitting as linked above

Thank you

1991 W124 300D
1992 W124 300D

Maybe it's just me but I can't get your peachparts or atpturbo links to work. I think you cut and paste the truncated URLs (with ...) from the thread rather than the entire URL.

Sixto
87 300D

You are right sorry about the links - ill look into it and fix it

Links have been fixed ... now maybe this can be of some help to someone

best to all

Chris

Hey I'll say all the info that gsxr posted was great. I recently bought the actuator for $100 and shorted rod (had to add some more threads to rod) and installed; drilled and taped the cross-over pipe just downstream of turbo: installed 90 degree fitting; small hose connected and a world of difference!
Great info!

Another solution to the rod length issue is to place several washers between the actuator housing and the mounting bracket thereby effectively shortening the rod... I did this after cutting the rod and discovering the need to cut threads and was concerned about the internal integrity of the wastegate if I should in the process turn the shaft too much ... so I erred on the side of caution and shimmed the housing instead

Chris

Instead of using washers I used the nuts off my old actuator. Photos are in this posting.

__________________
This car had a history, now it has a future.

Learn more about my Benz here.

Good Idea and less easy to drop a nut then several washers.. I hope the mod was up to your expectations

Chris

The mod was easy to perform and is a very simple yet elegant alternative to the (21 year old) MB design.

__________________
This car had a history, now it has a future.

Learn more about my Benz here.

The stock actuator is always holding the wastegate closed too. It's just using a computer-controlled vacuum signal, instead of a manually-controlled pressure signal. There is no change in EGT's unless you modify something else.

You don't want a T3 turbocharger a stock OM602 engine. If your turbo is bad, repair it or replace it.

Thanks...

I was under the impression the stock turbo is a T3 if not what is it and or what should I replace it with ?

additionaly - the reason I stated that the stock setup does not hold the wastegate closed at all times is that I ran arround with a shop vacuum gauge hooked to the vacuum signal being sent to the wastegate and it varied by throttle pressure form 10 in. at full to 2 in. at light throttle ( was one or the other not attenuated inbetween )

regards

OM603 stock turbo is T3.

OM602 stock turbo is T25. Replace it with a good used OM602 turbo, or just rebuild it. Messing with aftermarket will cause nothing but headaches on a stock motor.

Thanks,

where does one find a source for a rebuild kit / components / or a cartridge it there is such a thing available for the T25 ?

I just pulled mine from the parts stack and found the AT.. number to be AT0003 does that designate a T3 Garrett or is it the other numbers that designate the Garrett series ? by the by my other numbers were an exact match ( the best I can see ) from your image.

thanks

See info posted here:
Turbo blown (w124 300D)....where do i buy a new turbo?

I don't believe that number has any relation to T3 vs T25.

__________________
Check out my website photos, documents, and movies!