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  #1  
Old 08-25-2004, 11:07 AM
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W123 pros and cons....

I just spent the last two evenings replacing the intake/exhaust manifold gasket on SWMBO's 300D. Getting the turbo, and everything associated with it, off of one of these cars is not an easy task but isn't nearly as hard as it COULD be. A liberal dose of Rust-Buster™, Kroil™ penetrating oil and a little bit of patience was all it took to loosen fastners that had held the exhaust system together for 20+ years. I've pulled similar service on far, far newer vehicles where studs broke off in the head and nuts were stripped out doing this same thing. Every major fastner on her Benz was either stainless or some sort of bronze that reisists the effects of heat.

I remain awesomated by the diesel W123 but not the FSM that "supports" it. In this instance, the manual reads like a bad joke. My favorite was the phrase "...remove the intake and exhaust manifolds as a unit." Um yeah, right.

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Old 08-25-2004, 01:20 PM
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The manual for my '55 MG-TF had each repair reduced to a simple five steps...

the first was always "remove engine."
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Old 08-25-2004, 01:54 PM
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I couldn't agree more about how easily the 123s come apart. I've torn into a number of them in scrap yards now, and not had a stud break or a nut not come off. The way the turbo and air cleaner bracket are intermingled is a hassle, and last Saturday I wasn't sure if I could get the turbo (KKK) off without removing the wastegate. But I did, just barely. It's nothing like my 280Z, where it took me DAYS to get off the turbo - the exhaust pipe was literally welded to the downtube, and I had to seriously modify a 17mm wrench to get behind the turbo to get off the last bolt, 1/16th of a turn at a time. I would have saved time by pulling the whole head off.
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Old 08-25-2004, 02:49 PM
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Quote:
Originally Posted by Old300D
... seriously modify a 17mm wrench to get behind the turbo...
Modified 17mm wrenches will be the next thing I add to my toolchest. There were a couple of situations on this project (ironically, also behind the turbo) where some modified 17mm wrenches would have been a huge timesaver. As it turned out, I was doing the 'ol 1/16 turn and flip the wrench thing.
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Old 08-25-2004, 08:27 PM
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I dunno what it is about diesels but for some reason they don't seem to freeze up fasteners like gassers. I own three diesels and have never broken a bolt on the engines. When I had gassers and work on them stuff seems to break all the time. Maybe the fuel permeates everything like a light penetrating oil over time? RT
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Old 08-25-2004, 08:52 PM
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Quote:
Originally Posted by rwthomas1
I dunno what it is about diesels but for some reason they don't seem to freeze up fasteners like gassers. I own three diesels and have never broken a bolt on the engines. When I had gassers and work on them stuff seems to break all the time. Maybe the fuel permeates everything like a light penetrating oil over time? RT
The only thing I've ever broke are the thermostat housing bolts. Two times, both times coming off. I always change them out whenever I change thermostats now.
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Old 08-25-2004, 08:54 PM
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Quote:
Originally Posted by rwthomas1
I dunno what it is about diesels but for some reason they don't seem to freeze up fasteners like gassers. I own three diesels and have never broken a bolt on the engines. When I had gassers and work on them stuff seems to break all the time. Maybe the fuel permeates everything like a light penetrating oil over time? RT
That and the diesel is much cooler running engine then a gasser.
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Old 08-25-2004, 11:11 PM
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Talking

She's back on the road now. Including the reengineering/repair of the stupidly designed air cleaner mount, I have about 7 hours invested in replacing that exhaust gasket.

Anyone have any idea what this would have set me back in $$$ had I gone to an Indy?

One more thing...
While apart, I cleaned all the diesel plaque out of her intake tract and she certainly feels like she pulls better off idle now. Of course this scientific testing was all done 'off road' because my über-cool EGR blocking plate was installed too. I expect there will be a commensurate decrease in performance when I return the car to its intended configuration.
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Old 08-25-2004, 11:31 PM
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Quote:
Originally Posted by R Leo
...because my über-cool EGR blocking plate was installed too. I expect there will be a commensurate decrease in performance when I return the car to its intended configuration.

Sometime within the next 20 years, right?
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  #10  
Old 08-26-2004, 12:00 AM
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Quote:
Originally Posted by R Leo
She's back on the road now. Including the reengineering/repair of the stupidly designed air cleaner mount...
Not for the W123, but the W126 300SD with the 617 engine. Is there a way to retrofit the airbox from a 87 300SDL into the 300SD to remedy this problem? Maybe into the W123 too? Only flaw i can think of at the moment is the breather hose, where would that go? This is only a idea that popped into my head when i read that line.
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  #11  
Old 11-12-2004, 06:17 PM
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Quote:
Originally Posted by R Leo
She's back on the road now. Including the reengineering/repair of the stupidly designed air cleaner mount, I have about 7 hours invested in replacing that exhaust gasket.
By any chance did you take a picture of your reengineered air cleaner mount. Here is one that I took.
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  #12  
Old 11-12-2004, 07:51 PM
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Need pictures of trhe reengineered air filter mount.

How much crud was cleaned out of the intake???
Do you think it would be worth while to clean out the unit? All that work just to do that? or should we wait for something forcing us to remove the intake?

Dave
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  #13  
Old 11-12-2004, 10:27 PM
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Dave,
I wouldn't take the intake off just to clean it unless I knew I had performance related issues I could trace directly to a blockage. OTOH, with any sort of gasket issue or turbo problem, I would go ahead and plan on doing something to clean the intake.

Twitchkitty's mount looks much better than the job I did. Marlene's is happy to hide out underneath the aircleaner, Lilly's is happy to be there too.

Glad to know I'm not the only one that bends the turbo oil line out of the way to get that damned mount out of there. How stupid was that idea to run an oil line over a removable piece? Jeez.

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