Wastegate actuator swap for OM602.962? - Page 21 - PeachParts Mercedes-Benz Forum

JamesDean · #**301** 08-31-2012, 08:12 PM

Quote:

Originally Posted by JamesDean

Rather than read through 20 pages of thead. Simple question,

Why would I want switch to this setup rather than the factory setup, if it is working normally?

NICE JOB *******. YOU HAD TO JINKX IT.

So, looks like I've got some reading up to do..

Went for a spin in the car and as I was leaving a stop light, all of a sudden the engine refused to go past 2000 rpms, you know, where the turbo would normally kick in.. Sigh. The transmission shifted through its gears no problem. Looks like I'll be breaking out the vacuum gauge and checking ****. Maybe its just a hose.

Just a quick question:
http://i.imgur.com/ov38U.jpg

The black thing on the right side of the turbo does not hold vacuum... Lots of pumps of the MityVac did nothing.

Also, I didn't notice this before but is it normal for the shift lock to engage preventing me from shifting from D->P if I dont turn off the key first? That seems abnormal. If I turn off the key, I am then able to shift back to Reverse/Park..

sixto · #**302** 08-31-2012, 10:32 PM

The black thing on the right controls a flap that IIRC creates vacuum to draw effluent from the EGR valve. I don't know if the actuator pulls the flap open or pushes it closed. If/when you do the wastegate mod, you'll wedge the flap open.

Sixto
87 300D

JamesDean · #**303** 08-31-2012, 10:40 PM

Quote:

Originally Posted by sixto

The black thing on the right controls a flap that IIRC creates vacuum to draw effluent from the EGR valve. I don't know if the actuator pulls the flap open or pushes it closed. If/when you do the wastegate mod, you'll wedge the flap open.

Sixto
87 300D

Would that black thing or the wastegate failing explain my inability to get above 2k rpm off the line?

engatwork · #**304** 08-31-2012, 11:14 PM

^ The flap stuck closed will prevent the engine from accelerating like it is supposed to.

JamesDean · #**305** 08-31-2012, 11:21 PM

Quote:

Originally Posted by engatwork

^ The flap stuck closed will prevent the engine from accelerating like it is supposed to.

Jim,

The flap actuated by the black actuator or the waste gate? Can I wedge the black actuator flap open?

sixto · #**306** 09-01-2012, 02:09 AM

You can but EDS might notice and cut boost. From a diagnostic standpoint, you could get better than 2000 even without the turbo so it's worth trying.

Sixto
87 300D

engatwork · #**307** 09-01-2012, 07:11 AM

Try tie wrapping the flap in the intake manifold wide open. Flap actuated by black actuator.

JamesDean · #**308** 09-01-2012, 12:10 PM

Ok so doing that just angered the engine very much. I did more looking around and found the wastegate actuator. The vacuum hoses were pretty crappy and I couldn't get a reliable reading on the gauge either. So new hoses. And well see.

auspumpen · #**309** 09-01-2012, 05:07 PM

These sorts of issues are why I'm such a strong advocate for ditching as much of the nanny systems as possible. These cars are nearly all 20 years old by now and the vacuum and electrical bits have degraded to the point that they're no longer reliable. Switching to a boost activated actuator and scaling the vacuum lines back to just the bare minimum makes these cars so much more of a joy to drive and maintain. I choose turbo diesels because they're powerful, efficient and simple. Why deviate from that successful formula?

sixto · #**310** 09-01-2012, 06:03 PM

What's the red thing over your water pump?

What size hose do you have in place of the mixing pipe?

Sixto
87 300D

auspumpen · #**311** 09-01-2012, 06:33 PM

Red = the cans that rattle and usher forth smelly colors.

The mixer housing replacement is about an 8" long section of 2.25" silicone tubing.

engatwork · #**312** 09-01-2012, 06:52 PM

Quote:

Ok so doing that just angered the engine very much.

Should have mentioned you probably need to block off the egr too. Test purposes only.

JamesDean · #**313** 09-01-2012, 07:16 PM

Quote:

Originally Posted by engatwork

Should have mentioned you probably need to block off the egr too. Test purposes only.

What exactly does that flap do? Does it just meter how much air goes to the EGR? I'm not visualizing the damper inside the tube well.

sixto · #**314** 09-01-2012, 08:42 PM

IIRC it creates a vacuum to draw EGR into the mixing tube.

Remove the crossover pipe for a peek down the mixing tube.

Sixto
87 300D

big d · #**315** 09-01-2012, 11:47 PM

I did this swap on 1992 300D.Can i do this swap on 1991 350 SD.Everything look same ,or is it pressure activated turbo already.