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Turbo Oil Drain Tube Replacement
 
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Pelican Technical Article:

Turbo Oil Drain Tube Replacement

Steve Vernon

Time:

1-3 hours

Tab:

$45 to $140

Talent:

**

Tools:

14mm, 13mm socket

Applicable Models:

Mercedes-Benz 300TD (1979-85)

Parts Required:

Drain tube, gaskets and/or O-rings

Hot Tip:

Replace all the gaskets and O-rings

Performance Gain:

Stop the oil leaks

Complementary Modification:

Change oil and filter

If you are starting to get a leak in the oil drain tube from your turbo, you should fix it right away as it will only get worse and leave you with an engine that looks like it was from the Exxon Valdez. The oil drain tube from the bottom of the turbo is a notorious place for oil to leak. The tube is made up of two pieces and several O-rings and gaskets and eventually one of them is going to fail. It is possible to change out the gasket from the turbo and the O-rings between the upper and lower pipes without draining the oil from the motor but if you need to replace the lower section of tubing you will need to drain the oil and remove the lower pan.

If you are wondering where the oil is leaking from give everything a good clean and then run the motor a few times to determine the leak and save yourself some time by replacing only the broken section; it's a lot easier to replace the O-rings between the tubes than it is to remove the lower tube.

Over the years your car may have been serviced by multiple people including previous owners and this can lead to parts replaced with different size fasteners and hardware. The sizes of the nuts and bolts we give may be different from what you have so be prepared with different size sockets and wrenches. If something is different on your vehicle please let us know and share your info to help other users. If you have any questions or comments or even a different procedure you would like to share please leave it below and please include your vehicle information.

The drain tube is located on the bottom of the compressor side of the turbo (yellow arrow).
Figure 1

The drain tube is located on the bottom of the compressor side of the turbo (yellow arrow). To get at the drain tube begin by removing the air filter housing (red arrow). Please see our article on air filter housing removal for additional assistance.

Next remove the air intake tube (yellow arrow) from the intake (red arrow) to give you more room to work.
Figure 2

Next remove the air intake tube (yellow arrow) from the intake (red arrow) to give you more room to work.

Begin by removing the oil down tube from the turbo compressor side--start by removing the two 13mm bolts.
Figure 3

Begin by removing the oil down tube from the turbo compressor side--start by removing the two 13mm bolts. Remember there is a gasket there that will need to be replaced.

With the top section of the drain tube disconnected from the turbo you can lift it out of the vehicle (red arrow).
Figure 4

With the top section of the drain tube disconnected from the turbo you can lift it out of the vehicle (red arrow). If it is leaking from the O-rings between the two pieces you can replace the O-rings, install a new gasket and put everything back together.

If the oil is draining from the lower tube where it meets the oil pan (red arrow) you will need to drain the oil and remove the lower pan.
Figure 5

If the oil is draining from the lower tube where it meets the oil pan (red arrow) you will need to drain the oil and remove the lower pan. Please see our article on oil pan gasket replacement for additional assistance.

With the lower oil pan removed you can use a 14mm socket and press the tube out from the pan.
Figure 6

With the lower oil pan removed you can use a 14mm socket and press the tube out from the pan. If the gasket is really gone you might be able to pull it out from above but you risk destroying the tube doing it this way. If the gasket has failed more towards the top of the tube you may need to press the tube out using the socket and a jack beneath it. Installation is the reverse of removal.

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Page last updated: Fri 12/9/2016 03:01:19 AM