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  #16  
Old 05-14-2004, 03:57 AM
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smoke gets in your eyes
 
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Someone did some research and concluded that oil gets into the combustion chambers through leaky turbo seals and/or the EGR valve and causes one thing then another then the rods bend. It was a complex explanation that made sense when I read it. Not before and not since

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  #17  
Old 05-14-2004, 08:57 AM
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See Benzmac's post near the bottom of this thread.
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  #18  
Old 05-14-2004, 10:49 AM
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Interesting! I guess the best thing then is to disable the EGR so that you don't get into that situation. Were there any other things that could cause the rods to bend?
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84 300D Turbodiesel 190K with 4 speed manual sold in 03/2012
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  #19  
Old 05-14-2004, 11:14 AM
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Quote:
I guess the best thing then is to disable the EGR so that you don't get into that situation.
thats easier said than done on anything newer than 89.

my dad's got a 350SD, its been rebuilt twice, first by MB at about 40k miles (the timing chain failed, not the rods) but they didnt quite do it right, so it was rebuilt again by and indie mechanic at about 100k miles and its perfect.

since then hes had to replace the turbo, i think its got about 140k miles now.
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  #20  
Old 05-15-2004, 02:27 AM
compress ignite's Avatar
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Post 603 rod failure

Urban legend in the middle '90s attributed bent rods to "Deck
height" (for urban legends =/substitute:Montvale, N.J.)

Recently, Master forensic mechanics have promulgated the
theory: Glow plug failure on one or more cylinders leads to
excess unburnable fuel and HYDROLOCK.
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  #21  
Old 05-15-2004, 06:57 AM
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Interesting reading, thanks all. I guess there are several ways to "skin THIS cat" so to speak...the hydrolocking explanation makes a lot of sense, I can't really picture what the other was mentioning about the egr, but interesting nonetheless...I'm definately going to look more closely next time I come across one.

Hmmmm...I still want one though.
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  #22  
Old 05-15-2004, 05:50 PM
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Zero
 
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How about poor design and not enough testing by MB.
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  #23  
Old 05-15-2004, 06:48 PM
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Whatever the case, be it internal design flaw, or external device failure, MB does not and WILL not stand behind their product as of now.

To me, that speaks something of the brand.
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  #24  
Old 05-15-2004, 07:38 PM
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Prior to purchasing my new to me 91 350sd I asked 2 indies and 2 different MB shops about the bad engines, and got 4 different answers. hyrolock, poor design, excessive back pressure by the ceramic exhaust pipe, etc.

Then I read the 'report' on the 603 engine posted somewhere else. They say 40% fail, so 60% last. that's better than lots of things in life.
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  #25  
Old 05-15-2004, 08:48 PM
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Quote:
Originally posted by DslBnz
Whatever the case, be it internal design flaw, or external device failure, MB does not and WILL not stand behind their product as of now.

To me, that speaks something of the brand.
It sounds like M-B is becoming more like an American brand.
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  #26  
Old 05-16-2004, 12:44 AM
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I have two 350's, a 91 350SD and a 90 350SDL. I purchased the 350SD from the previous owner with 200,000 miles on it. He was one of these guys who did absolutely NO service. I have the service history on the car, and the most expensive thing it had done to it was the idler pulley and shock. To me it showed that someone could just drive one of them into the ground and it still keep going.

That being said, the engine is excellent. It had a couple of tired injectors, but no issues. Burns no oil, had some oil leaks that I fixed. Evidently, this must be one of them with a "good" engine. Course I went through the car and did a lot of maintenance to get it up to being my daily driver. After owning this car, and driving a couple of other 350s, I decided to not be so afraid of the engines.

Then couple weeks ago I grabbed a 90 350SDL with only 51,000 miles on it. Elderly gentleman owned it. This will be my keeper, course with my luck this one will develop some issues before it gets to 200,000 miles.
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  #27  
Old 08-11-2006, 02:04 AM
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Two and a half years later...

...and here I am posting two and a half years later!

I just bought a '91 350SD with 213,000 miles (now 214,000) and I love the car! It drives really great, is super fast and powerful, and is a real joy to drive!

I'm trying to find and follow all the tips and advice to keep this car running a long time, so please feel free to let me know if you have any recommendation (other than get rid of the car - I've already heard that one enough from the critics!)
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  #28  
Old 08-11-2006, 03:13 AM
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Hey Benster-
If you want a short article about the 350 Sd engine, it's more of the same as the others have stated. Am I allowed to put another website name on this thread, moderator?
Here goes nothin' MBZ.org you might already be familiar with this.
Under the Info category there is "complaints" . Click on that and it leads you straight to 350 SD article.
I stayed clear of the alleged years of this model because I didn't want to take a chance, becoming a first time MBZ owner just to be riddled with $$ problems. My other cars were trouble free and I want to keep the good Kar-ma going. Hope that helps.
Frankie
1984 300 SD rookie

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