turbo drain tube grommet/oring replacement - PeachParts Mercedes-Benz Forum

fezcabdriver · #1 08-31-2018, 12:39 AM

Is it easier to replace this with the turbo off? It appears to me that removing the turbo, I will not have to undo the upper oil pipe. Can I just pull up and out? And for the lower/grommet issue, is it easier(and even accessible) to hammer from the top instead of other methods seen (pipe strap and prybar)?

And finally, if I remove the turbo, the tube that connects turbo to manifold has two big o rings. Anyone know where I can find this? I can't find on az******** and Pelican.

Alec300SD · #2 08-31-2018, 02:15 AM

According to EPC, the seals were originally MB part number 004 997 54 48, superseded by MB Part number 021 997 86 48.

Two needed for the connector tube between the turbo output and the intake manifold.

Sold by the forum sponsor (or dealership).
There two listings at the bottom of this page https://www.pelicanparts.com/catalog/SuperCat/3306/MBZ_3306_ENGTUR_pg1.htm#item0
Best to get the OEM version...but the sponsor shows it as NLA.

If you are planning to remove the turbo (to rebuilt/replace it), then yes it easier to access and replace the turbo drain grommet "while you are there".

Removing and reinstalling the turbo is more work than just changing out the turbo oil drain seals, as turbo re-installation requires many addtional gaskets, seal rings, etc.

If you go that route (of removing the turbo), just get the turbo gasket set MB Part Number 617 090 06 80
(which includes the two turbo connector seals - MB Part Number 021 997 86 48).

Three choices for the turbo gasket set from the forum sponsor on this page
https://www.pelicanparts.com/cgi-bin/ksearch/PEL_search_2016.cgi?command=DWsearch&description=617+090+06+80
I've used the mid-priced Elring kits myself with good outcomes the two times I've removed and replaced the exhaust and intake manifolds on 'Desert Rose'.

fezcabdriver · #3 08-31-2018, 09:43 AM

Awesome thanks for the links. This was totally helpful.

fezcabdriver · #4 08-31-2018, 10:00 AM

Actually.. upon further research, I'm getting mixed procedures. Some say that the top drain tube needs to be removed before I remove the turbo. Other write-ups allude that pulling the turbo out once all other bolts are loosened/off will allow me to pull lower and upper tubes apart since it is just an oring in place.
Thoughts?

Alec300SD · #5 08-31-2018, 11:18 AM

The FSM does says to unscrew the upper oil drain tube form the turbocharger (Step 14).
https://www.startekinfo.com/StarTek/outside/12265/disc_2/program/Engine/617/09-430.pdf

Probably recommended so you don't inadvertently damage the drain tube if you are
heavy-handed when you yank the turbo up to unseat the oil drain tube sealing rings.

I've not removed the oil drain tube from the turbocharger when removing the
tubocharger (to pull W116 300SD non-EGR intake and exhaust manifolds).

I've not pulled a turbo from your specific model, so.. unscrewing the upper oil
drain tube from the turbocharger might be required, but I doubt it.

vwnate1 · #6 08-31-2018, 12:53 PM

To replace the lower grommet you'll need to separate the upper tube off the lower one, this means new O-rings .

Be smart and only use original M-B O-Ring and grommet ~ I've done a few and only the ones using factory rubber parts, don't leak/weep a single drop of oil after tens of thousands of miles .

If your hands are not too big and you're careful, methodical and diligent, no need to remove the turbo .

DO NOT try to remove the lower tube from above ! you'll damage it .

Junkman · #7 08-31-2018, 05:29 PM

There used to be a vid where the turbo drain tube could be removed without taking anything else apart.

Elring used to make a more comprehensive gasket set that included most gaskets to take the engine down to a long block. You may as well do the rest of you bother to pull the turbo.

ROLLGUY · #8 09-01-2018, 08:20 PM

Quote:

Originally Posted by vwnate1

.......................
DO NOT try to remove the lower tube from above ! you'll damage it .

I have done countless numbers of these, and I always removed the lower tube from above (pulling it out). Pulling the pan is a waste of time in my opinion (unless of course you have a leaky pan gasket, and plan to remove it anyway). The key is to completely remove the old grommet, and the tube will pull out just as easy as it is pushes in after replacing the grommet and O rings. I have had to use a pick to get the broken grommet pieces out from the groove, but still very doable. The upper tube does come out without removing the turbo, but you have to remove the grommet so the lower tube will tilt just enough to get the upper tube out. If the grommet remains, you will never get the upper tube out. Once everything is clean, and the new rubber parts on, the lower tube slides into the pan. Then the upper tube is put in place. Then the grommet can be slid down into place. I like to use Gasgacinch on these (clean) parts for the best sealing possible. Also, the grommet will slip into the groove with ease if a thin coat of Gaskacinch is used. It is also great for holding the gasket on the upper tube for easy installation. A 1/4" drive ratchet and 13mm socket make it painless.....Rich

vwnate1 · #9 09-01-2018, 11:27 PM

Thanx Rich ;

I'd tried to chisel the old rock hard grommet out, I simply couldn't get it and others warned me not to yank it out, I did and bent it doing so .

SD Blue · #10 09-02-2018, 04:32 PM

Ditto what Rich said.

I read all kinds of incorrect, unnecessarily difficult ways of doing this job and ruined the first 2 grommets. Then I came across some notes that described what Rich mentioned. It took less than 30 minutes and hasn't leaked in several years.