The following page is a backup which was originally created by Richard Easley and Stu Ritter, all credit should be given as such. Most links on these pages are unfunctional.
Replacing the
Turbocharger Oil Return Tube Seals
on Mercedes-Benz 617.952 Diesel
Engines
Introduction
The technical material for
this FAQ (Frequently Asked Question) was provided by the staff at Stu Ritter
Mercedes-Benz Technician, Inc. of Denver, Colorado, was edited by Richard Easley
of Baylor University, and is provided as a service to the subscribers of the
Mercedes-Benz Discussion List.
To receive similar quality
tips as described below on a daily basis, consider subscribing to the
Mercedes-Benz Discussion List, which is located at the following
site:
http://hsb.baylor.edu/html/easley/mercedes/welcome.html
Assumptions
Using the categories of
mechanical ability from the Mercedes-Benz Discussion List <http://hsb.baylor.edu/html/easley/mercedes/subscribe.html>, you need to be at the level of
"Medium Do-It-Yourselfer" at minimum, to replace the turbocharger oil
return tube seals. If you are below that level, you may want to provide these
instructions for someone who is at the medium level or beyond.
Parts needed:
1. Spray brake
cleaner
2. Silicone
3. Upper tube
gasket
4. Lower tube
O-rings
5. Lower tube (in case old one is/gets
distorted)
6. Seal for lower oil pan hole (for lower
tube)
7. Lower oil pan
gasket
Picture of Turbo Oil Return Tube Seal Procedure
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Replacing the
Turbocharger Oil Return Tube Seals
1. Pull the lower oil pan, yes, pull the
pan (there are two). It only takes
about 10 minutes.
2. Don't remove the
turbo.
3. Do loosen the two bolts that mount the
upper tube to the turbo.
4. Rotate that tube 180 degrees to
facilitate removal of the lower tube.
5. Attach a heavy hose clamp to the lower
tube that will enable you to tap on it from the bottom with a drift in order to
remove the tube.
6. Remove lower
tube.
7. Scrupulously clean O-ring grooves on
lower tube.
8. Scrupulously clean hole in upper oil
pan where lower tube slides through.
9. Install O-rings on lower
tube.
10. Inspect seal and lower tube w/O-rings
carefully. Do a "dry run" on
inserting tube in seal on the workbench.
Note how O-ring "seats" in groove on seal. Repeat until you are comfortable that
you know when they are joined properly.
11. Lightly, lightly coat inside of lower
pan seal with silicone (*very* thin, no excess).
12. Insert lower tube into seal and push
through until lower O-ring is below seal.
13. Lightly, lightly coat outside of
lower pan seal and lower O-ring on lower tube with silicone (*very* thin, no
excess).
14. Install seal/tube assembly in oil pan
until seal bottoms out along its flange.
15. Put upper oil return tube on top of
lower oil return tube at 180 degrees offset from final
fit.
15. Looking up at oil return tube from
under car (through hole in pan), use a drift to tap lower oil return tube and
lower O-ring in place. [For DIYers, read: a deep socket that is large enough to
fill hole will work as a makeshift drift.]
16. After ensuring that lower oil return
tube is seated, swivel upper oil return tube into place, slide new gasket in
place, and bolt upper tube to turbo.
17. Clean lower oil pan and install new
lower oil pan gasket.
18. Install lower oil pan and torque all
bolts.
19. Refill engine with
oil.
20. Check for
leaks.
Finally, let me know if you
complete this procedure successfully; it took a while to type this, and I'd
appreciate knowing when each person has completed the repair! Please e-mail me
at richard_easley@baylor.edu
Note: To receive similar
quality tips as described above on a daily basis, consider subscribing to the
Mercedes-Benz Discussion List, which is located at the following
site:
http://hsb.baylor.edu/html/easley/mercedes/welcome.html
©1999
Richard Easley, Waco, Texas and Stu Ritter, Denver, Colorado.
The
Mercedes-Benz Discussion List is not affiliated with any other Mercedes-Benz
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America or any of its subsidiaries.