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  #1  
Old 08-16-2005, 12:01 PM
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Location: Norwich, VT USA
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Turbo oil drain - wrenching report

Observatuions associated with last nights replacement of the turbo drain line (2 o-rings, 1 grommet, and the lower tube):

I read what I could get my hands on. The manual was the most amusing. Something like "put grommet in, insert lower tube, reassemble"

I also discussed the job with a forum member who had done it twice before (Many Thanks Mark!)

Background/existing conditions:
- air cleaner assembly removed (could houdini do this work with that sucker in the way?
- engine shocks removed - improved access
- Oil pan removed - helped me to be able to tap lower tube up from below

Random observations:
- 3/8" drive with 13mm with universal enabled me access to both bolts
- mirror very helpful to assess condition of gasket/flange and grommet seating
- I removed AC hose bracket nut to block (17mm shallow on ~5" extension) adjacent to drain tube terminal point to increase access
- I used a strap to gather and hold out of the way the wiring to the alternator, the ac line and the block heater cord.
- I used some sythetic grease (the kind that doesn't eat rubber) to assist grommet install on tube and then grommet install.
- I used hylomar (non-hardening sticket gasket type stuff to stick gasket to flange
- sliding grommet up on lower tube then installing tube, loosely assembling upper tube and then carefully pressing in (back edge first) gromment anded up working for me.
- replace or at least clean cyclone drain tube whilst in the neighborhood
- If I had three wishes one would have been to have a lift.
- elapsed time for first timer from start to finish (initial attmept resulted in inability to install grommet, 2nd attempt successful....drum roll please....4 hours.

One step closer to awakening the sleeping "beauty"

offered only as my experience good bad or indifferent.

Cheers!



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1980 240D Euro delivery 4 speed manual silver/blue
~160K miles
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Old 08-16-2005, 12:14 PM
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glad to hear it worked out. That's one of those jobs that sounds easy when you describe it, but in reality has limited access, on your back, and then you look at the grommet and the hole and you think "Now, how the f*#@ is this going to fit?"
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Old 08-16-2005, 01:03 PM
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Good Job.

I had this link saved in my subscriptions, in case anyones interesterd:

W126 OM617 1985 300SD turbo drain tube gasket & seals

Great writeup!

Danny
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Old 08-16-2005, 05:12 PM
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I would like the opinion of those who have done this job.

The SD is sitting with the head and manifolds off. The turbo draing tube has ready access from the top.

There is not a drop of oil aroung the base of the drain tube, where it enters the oil pan. Dry as a bone.

So, what's the plan?

If it ain't broke, don't fix it???

I've got no desire to drop the lower pan if I don't have to.
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Old 08-17-2005, 08:01 AM
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Were I you I would leave the lower oil pan on and yank the lower drain tube, test it for leaks (Find a pool, lake, pond, ocean, stream, etc. take it swimming, cover one end and see if you can blow bubbles. Repeat from other end.) I'd also replace the grommet and the o rings, and heck go hog wild and replace the paper gasket.

If the grommet comes out intact yippee. If not then I'd chase missing bits by removing the lower oil pan.

I would also carefully evaluate the condition and routing of the block heater and whatever else is now easily accessible, like the cyclone drain tube mount for example....That would about what I wuld do....It would hard to restrain myself not to do more as I have chronic ship fitters disease.

Cheers
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1980 240D Euro delivery 4 speed manual silver/blue
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Old 08-17-2005, 08:24 AM
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Brian, especially if that lower grommet is pliable, I think your initial intention is correct - I'd leave it alone. Chances are that it was replaced by previous owner. Besides, while it's no walk in the park, it's doable, and it's only a little easier with the head off. Plus, the SD has the A/C hoses on the left side, so it's not as tough as what Rob had to do.
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'82 300SD - 361K mi - "Blue"

"Good judgement comes from experience. Experience comes from bad judgement."

listen, look, .........and duck.
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Old 08-17-2005, 01:29 PM
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Quote:
Originally Posted by Pete Burton
Brian, especially if that lower grommet is pliable, I think your initial intention is correct - I'd leave it alone. Chances are that it was replaced by previous owner. Besides, while it's no walk in the park, it's doable, and it's only a little easier with the head off. Plus, the SD has the A/C hoses on the left side, so it's not as tough as what Rob had to do.
Yeah, thanks Pete.

I really was thinking the same thing. It's just in too good of a condition to start messing with it.

The cyclone drain tube, however, pulled right out of the fitting on the pan. Does this just get a replacement o-ring, or is there more involved with it??
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Old 08-17-2005, 01:55 PM
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just the o-ring I think. That's the one with the cad plated stem pressed into the pan, right?
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