What engine in this 300sd? - Page 2 - Mercedes-Benz Forum

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post #11 of 24 (permalink) Old 10-09-2005, 10:27 PM Thread Starter
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RE: What engine in this 300sd?

Hey, you've got one of those 350 "rodbenders". How is it?
And highway cruizing comfort is exactly what I'm looking for. Hopefully I can get the mileage I want.
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post #12 of 24 (permalink) Old 10-09-2005, 11:21 PM
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RE: What engine in this 300sd?

I believe the rod bending was over with by 92 as stronger rods were used in the later 350s.
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post #13 of 24 (permalink) Old 10-10-2005, 12:57 AM
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RE: What engine in this 300sd?

I just wanted somebody to inform you on the issue. I am not an expert and never owned one so I can't give you the story.

Not all diesels are created equal.
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post #14 of 24 (permalink) Old 10-10-2005, 01:01 AM Thread Starter
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RE: What engine in this 300sd?

Another question. Reading in the FAQ up top that the 300 means a 3 liter, and so on for the other engine choices. So why does the 93 have a 3.5, but still be a 300? Is that just a W140 thing? Does the 300 only mean that in the w126? Help me out here. I'm learning!
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post #15 of 24 (permalink) Old 10-10-2005, 01:18 AM
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RE: What engine in this 300sd?

Not all W126 chassis have the legendary cast iron head 3 litre 5 cylinder OM617. only '81-'85 do. After that is was an aluminum headed 6 cylinder that wasn't as good and other variations thereof.
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post #16 of 24 (permalink) Old 10-10-2005, 02:49 PM
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RE: What engine in this 300sd?

All 350 engines('90 - '95) bend their rods at some point. It's just a question of when.
I just happened to see ANOTHER poor example of a 350 at the Gulf station on Rt. 1 North Hampton(~124K miles).
I didn't have the heart.....300SD turbodiesel(beginning signs with blue smoke). Boy did it stink.

'91 350SD:
My first engine lasted 88 K miles. Some 200K miles later, the current engine is ready for scrapping. The current engine was manufactured in the summer of '95(stronger conrods). I question: is it worth it to replace it with a 3.0 liter engine? Or should I part it out, splitting parts between my SE and the SDL? In the meantime it sits in a heated garage, undistrubed.

If I ever started it, the FD would be at my doorstep in at least 30 minutes. It shakes so badly that the engine looks as if it were to break through it's mounts and fly into the air. It smokes so profusely, it could cause panic in the streets. Makes Uncle Buck's car look like a Prius at tickover(maybe a slight over-exageration). The oil filler cap, when removed can easily blow off the valve cover. Reminds me of old Faithful(in better times) with every revolution the engine turns. What a violent thing she is! You should see her in the engine bay. Side to side (BROOOOOM, BROOOOOM, BROOOOOM, CLACK, CLACK, CLACK, PUFF, PUFF, PUFF). Madly demonic, in a sense!

DO NOT EVER BUY A 350. I used to love this engine every bit as much as my 300. I made many video clips of it. I loved my diesels more than my gassers. I'm glad I didn't own two 350's instead of one 300 and one 350. The 350, in running condition, was a superior car to the 300. It was quieter, just as efficient, offered more practical features, and had sharper interior appointments. It's shameful it turned into such a miserable failure.
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post #17 of 24 (permalink) Old 10-10-2005, 06:10 PM
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RE: What engine in this 300sd?

I don’t know 140s but that’s what my research revealed – DB never acknowledged the rod bending but secretly reinforced the rods in time for the 140s, actually just before the end of the 126.

So where does one direct a prospective buyer for a classic MB diesel? The 617 is by far the superior engine but not as refined and responsive as the 3.0 L 603; one must be cautious with the heads but the engines are otherwise strong. Some – not me – may find the first gen diesels too pedestrian and plain; I consider that a virtue. I guess from now on I’ll just direct a prospective buyer to a first gen 300 SD, it will be their responsibility to check out the car and I can look myself in the mirror.

My plan: put a fresh 617 and its 722.303 in a mint 350 SDL chassis.


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post #18 of 24 (permalink) Old 10-10-2005, 06:47 PM
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Be prepared for this:

“Mr. Dieselburns, we don’t know anything about ‘rod bending’ with regard to your engine.�
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post #19 of 24 (permalink) Old 10-10-2005, 08:44 PM
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RE: What engine in this 300sd?

Quote:
MisterDonut - 10/10/2005 8:22 PM

Well soooo far nothin has gone worng with the engine in my S350. Now im scared! Since all this talkin about the rod bending of 350 engine is brutal, and it will never go away because its an on going problem. Next weekend im takin my S350 to the MB dealer for a super check up on the engine, and talk to the MB guys about this rod bendin from the S350 engine.[B)]
You just have to keep on top of things. Pull it apart when you have suspicions and take measurements. I was in denial, since I had the reinforced engine. But apparently those are still prone to these issues. I did get 200K miles out of it, still.

What is still up for debate is why these engines fail. Since MB will not disclose any information.
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post #20 of 24 (permalink) Old 10-10-2005, 08:50 PM
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RE: What engine in this 300sd?

Quote:
jzaroh - 10/10/2005 10:44 PM

What is still up for debate is why these engines fail. Since MB will not disclose any information.
What is your opinion of the faulty turbo oil seal?
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