Wastegate actuator swap for OM602.962? - PeachParts Mercedes-Benz Forum

clickclak · #1 08-27-2009, 11:09 AM

Quote:

Originally Posted by gsxr

I don't have a complete part list available. It seems that we may not be able to convert to the full Euro setup without the Euro turbocharger or exhaust manifold (or both). The Euro crossover pipe doesn't seem to line up any better than the US, it's still too far away. It's supposed to look like the photos shown here.

Depends what year/model you're talking about - the 602.962, which this thread is discussing, does not have ARV on the turbo at all. But in both cases, I removed all the stock plumbing, and changed the vac source fitting as shown here, so there is no vac feed to any smog equipment.

No need to. The '87 300D already has the pressure wastegate. Just disable the EGR and ARV, and block or remove the plumbing.

On the '93 it will allow disabling the EGR, and it also prevents the computer from cutting boost unnecessarily. It won't do anything for turbo lag. You can tweak the ALDA and/or full load to try and improve power, but once you're at the factory spec of about 12 seconds 0-60 (as measured via stopwatch), it's not gonna get any better without stuffing a 6-cylinder under the hood. The 2.5 engine is nice for economy, and it's fine once the RPM's are up, but off idle (and off boost) it's sluggish. Can't fix that - simple lack of displacement.

Thanks. I suspected the problem was lack of displacement, but I haven't tweaked anything including the alda due to ignorance of the subject. Does the factory repair CD show this process?

Regarding parts, I have a source in Germany that can get them, but without the numbers and a definite matchup on the crossover, turbo and such I'll have to wait

Regarding the 87 300D, forgive my ignorance but when you say disable the EGR and ARV, do you mean remove the vac transducers, and physically remove both of these components? I know to unbolt EGR and install a cover plate, but the ARV looks permanently attached. Or do I plug it ? The transducers on this car are bad so I took them out and was about to replace @ $100 each

when I found this thread. Thanks for your help.

Bio300TDTdriver · #2 08-27-2009, 11:17 AM

Quote:

Originally Posted by clickclak

Regarding the 87 300D, forgive my ignorance but when you say disable the EGR and ARV, do you mean remove the vac transducers, and physically remove both of these components? I know to unbolt EGR and install a cover plate, but the ARV looks permanently attached. Or do I plug it ? The transducers on this car are bad so I took them out and was about to replace @ $100 each

when I found this thread. Thanks for your help.

Yes you can remove them completely. You use the "F" shaped vacuum connector (601-078-06-45) to eliminate the unneeded vacuum lines. Mine are still sitting in a box in the garage. I'm not sure why I don't just dispose of them.

gsxr · #3 08-27-2009, 04:34 PM

Quote:

Originally Posted by clickclak

I suspected the problem was lack of displacement, but I haven't tweaked anything including the alda due to ignorance of the subject. Does the factory repair CD show this process?

It does mention it (click here) but there are no step-by-step instructions. Search this forum and you'll find a lot of info on the ALDA. However, be careful with the round canister style ALDA used from about 1992-up... I think those must be adjusted via shims only. The older square type can be adjust via shims or setscrew. Click here for details on the shims.

Quote:

Originally Posted by clickclak

Regarding the 87 300D, forgive my ignorance but when you say disable the EGR and ARV, do you mean remove the vac transducers, and physically remove both of these components? I know to unbolt EGR and install a cover plate, but the ARV looks permanently attached. Or do I plug it ? The transducers on this car are bad so I took them out and was about to replace @ $100 each

when I found this thread. Thanks for your help.

To clarify the previous post... you can physically remove the plumbing and transducers. You can remove the EGR if desired, or it can stay in place, if it's not leaking. The ARV can stay in place, it rarely leaks or causes problems. To remove the ARV you have to disassemble it and find a plug of suitable size... I didn't bother, I just unplugged it.