Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help

Go Back   PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Diesel Discussion

LinkBack Thread Tools Display Modes
Old 03-02-2006, 01:41 PM
Registered User
Join Date: Feb 2006
Location: Central Maine
Posts: 165
Turbo not working. What is this picture?

I'm not sure what this part does. It has a line from the banjo bolt. It also has a line to the ALDA. There seems to be some sort of electronic switch attached between.

My turbo seemed to work briefly yesterday. I noticed it's performance waning (it was a rocket just after I did the diesel purge) I cleaned the banjo bolt. It had a medium amount of soot and gunk. It was not 100% blocked I would call it maybe 50%.

After cleaning the banjo bolt.. I don't seem to have any turbo now.

This was not a rapid change kind of thing. I know I didn't disconnect anything.

Is this part involved?

I havent recieved my ordered boost gauge yet. (where to I T that in?) Is there a way to troubleshoot the turbo?

I read up a bunch of threads.. but I don't seem to be able to get a handle on the order of things I should be checking. Is there a way to manually bypass (for a short term run up in the driveway) the wastegate?

Second Picture is my EGR. Did I do the bypass right? What is the small item with the vacuum line below the EGR?


Attached Thumbnails
Turbo not working.  What is this picture?-pics-007.jpg   Turbo not working.  What is this picture?-pics-009.jpg  
Reply With Quote
Old 03-02-2006, 01:42 PM
TheDon's Avatar
Ghost of Diesels Past
Join Date: Oct 2005
Posts: 13,268
overfueling protection .. thing.. in the first pic

to check the turbo for shaft play and ease of spin make sure the car is off and engine cool

put your hand in the turno inlet if you can after removing the u-tube..

spin the wheel and see if it spins with ease..

the next test is use your thumb or finger see if you can move the wheel forward and back or up and down

also the second pic i have no idea what that is.. my 85 300D-T has it too.. i have a triple k turbo what do you have

also you might want to get the kit to remove the EGR it makes everything look clean and if your egr was stuck open the blocked vacuum line wont do a thing
Reply With Quote
Old 03-02-2006, 01:51 PM
arcticathlon's Avatar
Registered User
Join Date: Aug 2005
Location: Richmond, Tx
Posts: 1,127
the item you circled in the 2nd pic is the ARV or air recirculation valve. i not 100% sure, but i think it opens up at some points while driving to put compressed air from turbo back into the air filter. it is useless, and i disabled mine via the BB in the vacuum line.

Grey '91 350SDL 214k
Beige '81 240D 4 Speed 254k
Blue '82 300D 225k SOLD
White '95 E300D 46k SOLD
Blue '87 190D 2.5 Turbo 315k SOLD
Brown '80 240D 4 Speed 716k SOLD
Beige '80 300D N/A 119k SOLD
Blue '85 300D Model 186k T-Boned
Reply With Quote
Old 03-02-2006, 01:54 PM
ConnClark's Avatar
Power User
Join Date: Nov 2005
Posts: 1,121
The second picture is of the over boost protection valve on the turbo. I think on the OM617 engines only 85 had them. I think, but am not sure, they removed the over fuel protection in favor of this protection valve on the turbo on the 85s.

Edit: Check and see if you cracked the ALDA line. I did this once.
green 85 300SD 200K miles "Das Schlepper Frog" With a OM603 TBO360 turbo ( To be intercooled someday )( Kalifornistani emissons )
white 79 300SD 200K'ish miles "Farfegnugen" (RIP - cracked crank)
desert storm primer 63 T-bird "The Undead" (long term hibernation)
Reply With Quote
Old 03-02-2006, 02:16 PM
Registered User
Join Date: Oct 2005
Location: Laramie, WY
Posts: 135
overboost protection

I just had the same problem with my turbo. Turned out the overboost protection module was plugged. In the bottom of the module it was completly plugged. I am not sure how to vacuum test the module but my understanding is that it should let air flow through it freely when the electrical connector is unhooked. A new one is around 40 bucks from the MB dealership.

87 300TD 603 I-6
94 Jeep XJ I-6 4.0 (see the pattern)
89 750il
seventy-two hundred feet above sea level (kinda cold up here)
Reply With Quote
Old 03-02-2006, 03:09 PM
Registered User
Join Date: Feb 2006
Location: Central Maine
Posts: 165

I'm in the middle of draining the tank. Doing it with a long line attached to the main line next to the IP. It's slow.. but no mess. Dumping it into my home heating oil tank. (i had put in about 50% K1) It's slow going though.

I changed the oil while I was waiting.

The turbo does spin freely. I will try and move it around. What kind of line would you use to replace these vacuum lines? They have some plastic tubing at the hardware store.. is that it?

Need to find a big socket (hope I don't have to drive in town) to take off tank screen.

So it's some sort of electrical connection to cut out the boost. Could I just connect the banjo bolt to the ALDA and bypass it?

THanks much

Reply With Quote
Old 03-02-2006, 04:58 PM
TheDon's Avatar
Ghost of Diesels Past
Join Date: Oct 2005
Posts: 13,268
did you try using some channel lock pliers to get the screen out.. i used a channel lock on the fuel tank sender.. they should also work down there
Reply With Quote
Old 03-02-2006, 06:56 PM
sailor15015's Avatar
Reverse lights! Score!
Join Date: Apr 2005
Location: Norman, Oklahoma
Posts: 1,184
You would think they would but the nut's not deep enough to get a good grip on it. Its hard to describe unless you actually get under there and look at it but there's some kind of shielding in the way that makes access with anything but the right size socket rather difficult. I tried it with some medium size and really large sized channel locks to no avail.

1984 300D 225K
1985 300D Donor body
1985 300D Turbo 165K. Totaled. Donor Engine. It runs!!!
1980 300SD 311K My New Baby.
1979 BMW 633csi 62K+++? Dead odo
Reply With Quote
Old 03-02-2006, 07:13 PM
Registered User
Join Date: Feb 2006
Location: Central Maine
Posts: 165

Your right.. there is a shield of sorts. Couldnt get enough muscle on a pair of channel locks.

I borrowed (after leaving a 20 dollar bill) a socket. Trouble was.. sockets that big are 3/4 drive. with the adapter to 1/2 or even with a breaker bar... it was just TOO LONG. I couldnt fit it between the axle half and the screen.

I ended up taking the air chuck and blowing everything out. All I could do.

Tomorrow's project is the turbo.

Reply With Quote
Old 03-02-2006, 08:38 PM
Diesel Giant's Avatar
Registered User
Join Date: Oct 2004
Location: Loganville/Atlanta
Posts: 2,156
This may explain the functions of your pictures
1981 300D 147k
1998 VW Jetta Tdi 320k
2001 Dodge Ram 2500 141k
1979 300D 234k (sold)
1984 300D "Astor" 262k(sold)
Mercedes How-To and Repair Pictorials
I love the smell of diesel smoke in my hair
Reply With Quote
Old 03-02-2006, 09:03 PM
Registered User
Join Date: Feb 2006
Location: Central Maine
Posts: 165


On my 300SD.. the line goes from the banjo bolt to this little switch.. then to the ALDA.

After my oil change, and tank drain.. all seems fine with the turbo. I got about 14 to 15 second 0 to 60.

I used your kit for the fuel lines. There were two threaded hoses at the tank bottom. I replaced the one at the screen.

I did the injector return line kit I bought as well. I had one hose that wasn't long enough. The #1 injector to the fuel filter line is about 18" long.

I'll give a call with my next order, and get the couple bits and pieces I need.

THanks for helping the other day. I ended up putting in a straight pipe, and a simple muffler. Works great.

Reply With Quote
Old 03-02-2006, 10:10 PM
Registered User
Join Date: Feb 2006
Location: Saratoga, CA
Posts: 46
Try checking the boost pressure lines

I ran into this a few years ago - my turbo hadn''t worked since the day I got the car - I assumed it was toast and paid accordingly. I always had planned to fix - one day it kicked in for an afternoon and then didn't work after that. After considerable testing/research, I determined that (on my 87 300D) it was the fault of a "programmed repair" which was intended to stop the cruise control from surging as a result of the turbo kicking in and out when the cruise engaged. Effectively, it's purpose was to slow the responsiveness of the turbo but a restrictor had plugged and was preventing boost pressure from getting to the control at all.

Below are the pics - the diagrams are from RA 07.1.1051-0250 - "Retrofitting Damper with Restriction Orifice" - see pictures of this on the car:

The 1st picture is the area to find this mod
The 2nd is the "accumulator" (see #4, Diagram 1)
The 3rd is the restrictor that plugged up in my case (#61c in Diagram 1)
The 4th is Diagram 1
The 5th is the parts list of all the items in diagram 1

As per above, part 61c in the diagram had filled with oil and the restrictor was completely blocking the boost line (except that one afternoon, strangely...) I removed it and bought another but it slowed my turbo performance so I removed it entirely. Has worked perfectly ever since!

Moral - if you have the 87 300D, check here first. If not, ensure that your boost pressure lines are clear before undertaking much more, it's very easy to check (just follow the lines along and ensure that they're clean...)

Someone please let me know if it's NOT ok to post the diagrams...

Good luck,
Attached Thumbnails
Turbo not working.  What is this picture?-1-_overview.jpg   Turbo not working.  What is this picture?-2-_accumulator.jpg   Turbo not working.  What is this picture?-3-_strainer_000_078_03_56.jpg   Turbo not working.  What is this picture?-4-_diagram1.jpg   Turbo not working.  What is this picture?-5-_partslist.jpg  

Last edited by Chris_87_300D; 03-09-2006 at 12:03 AM.
Reply With Quote
Old 03-04-2006, 02:37 PM
banshee350's Avatar
Registered User
Join Date: Apr 2005
Location: SW wash
Posts: 143
Unhappy Virus in this post

I tried to open the link in the above post last night and got a virus detected and was sent to a site with a blank page it flashed buy so fast that I did not know what had happened untill I hit cont alt del and found that my virus scaner had been actvated but buy then I was locked up modum was still flashing so I unpluged line and had to do a reset and run virus scan.Found a few in system.

89 Ford F3504x4CC 7.3 IDI turboed Intercooler and running on wvo now powered by a 1997 Cumins
87 300SDL on bio and wvo killed by chevy truck 5-24-06
1999 E300TD black with gray int.
Reply With Quote
Old 03-04-2006, 04:00 PM
Palangi's Avatar
L' Résistance
Join Date: Dec 2000
Location: Republique de Banana
Posts: 3,496
Something about a link with the word "pirate" in it tells me it is not a good idea to click on it. I have seen that sort of thing happen before.

2004 C240 Wagon 203.261 Baby Benz
2008 ML320 CDI Highway Cruiser
2006 Toyota Prius, Saving the Planet @ 48 mpg
2000 F-150, Destroying the Planet @ 20 mpg

0BAMA .......... OUTHOUSE
Reply With Quote
Old 03-04-2006, 08:03 PM
Hatterasguy's Avatar
Join Date: Nov 2002
Location: Milford, CT
Posts: 19,307
I deleted the link.

2020 GMC Sierra Denali
2007 Tiara 3200
Reply With Quote


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On

All times are GMT -4. The time now is 04:54 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2021, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page