Greetings from Sonoma County, CA - Mercedes-Benz Forum

LinkBack Thread Tools Display Modes
post #1 of 2 (permalink) Old 09-17-2011, 01:57 PM Thread Starter
BenzWorld Newbie
SWG_603971's Avatar
Date registered: Sep 2011
Vehicle: 1994 S350
Location: Sonoma County, CA - USA
Posts: 2
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
(Thread Starter)
Post Greetings from Sonoma County, CA

Just signed up for the forums, have a lot to learn about Diesel MB. Since I was a kid I've been following motorsports. Trained to be a mechanic at one point and have a good general knowledge of automotive systems.

I've always wanted a diesel benz. I found one 3 months ago. It was a S350 with under 58k on the odo. Beautiful shape except the engine. Major smoking. A good look at the exhaust pipe indicated heavy oil burning. Had a feeling it needed a motor. Made an offer and took it home. It's still not running right, most of the story is below.

Any of you diesel guru's out there have any helpful advise on the story, I'd welcome your input. We are scratching our heads on this.


Story of the rebuild to date.

After performing all of the easy diagnostics for oil consumption (turbo, flushed the fuel system, intake, etc) we Pulled the motor. Found lots of oil residue in the exhaust ports of the head and some glazing. Exhaust valves were coated really thick. Cylinder walls had some sort of 'glaze' from something as well as the top of the combustion chamber.

The good news is the cylinder circumference measures were to spec, no out of round holes and factory honing was still noticeable with no score marks.

Pistons were coated with the glaze too. Interesting, what the heck would 'glaze' the inside of a combustion chamber?

Measured all the bottom end components at the machine shop, everything checked out. Cleaned and honed the block and put it back together. Replaced timing chain and H2O pump also.

Found nightmare stuff with the EDC. Waste gate was wired closed by some previous hatchet man, never allowing it to open. Several sensors were replaced and or bypassed. We have managed to clear all the codes in the EDS. We have the car running pretty well.

The Injection Pump is being sent out next week, issues remain...

Throttle response is very good cold and at normal operating temp just a little less responsive. You do notice exhaust smoke at times using very little throttle.

When temperature reaches the high end of normal (gauge just past 80) engine torque drops massively. If it cools down just a little some of the torque returns but not to the levels during warm up.

Engine is not heavily loaded as temperature climbs. Minor inclines at freeway speeds that require a bit of throttle to maintain speed causes increase engine temps.

H2O pump, thermostat and coolant were replaced.

I'm thinking the EDS is dialing back the fuel due to engine temp causing the severe torque loss. What's causing the temp rise?

I'm thinking the engine is heating up too quickly, possible high EGT's due to a injection pump malfunction. The other possibility is a plugged radiator.

Back to the shop on Monday.
SWG_603971 is offline  
Sponsored Links
post #2 of 2 (permalink) Old 09-17-2011, 06:52 PM
Outstanding Contributor
eric242340's Avatar
Date registered: May 2007
Vehicle: Zotye Auto 1.5T T600 2016
Location: The wild west of the Far East
Posts: 52,588
Mentioned: 3 Post(s)
Quoted: 311 Post(s)
Welcome to Benzworld

W140 S-Class - - Mercedes-Benz Discussion Forum


People sleep peaceably in their beds at night only because rough men stand ready to do violence on their behalf - George Orwell
eric242340 is online now  
Sponsored Links

  Mercedes-Benz Forum > General Mercedes-Benz Forums > General Mercedes-Benz

Quick Reply

Register Now

In order to be able to post messages on the Mercedes-Benz Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Similar Threads
Topic Author Forum Replies Last Post
NY, Great Neck johnvd U.S. - East 25 10-25-2016 06:44 AM
hello from Sonoma vistavilla General Mercedes-Benz 1 09-17-2011 06:40 PM
Hello! New from Lee County, FL TimmahW123 General Mercedes-Benz 4 08-29-2009 12:22 PM
Greetings from Orange County Den's240D General Mercedes-Benz 4 05-27-2009 06:42 AM
South Orange County/San Diego County Caravan(s) viper655rt10 Events 3 12-29-2008 10:42 PM

Posting Rules  
You may post new threads
You may 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 Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Title goes here

video goes here
description goes here. Read Full Story
For the best viewing experience please update your browser to Google Chrome