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Pelican Technical Article:

Lower Oil Pan Removal

Kerry Jonsson

Time:

1 hour1 hr

Tab:

$100

Talent:

**

Tools:

5mm Allen head socket or key

Applicable Models:

Mercedes-Benz R129 (1990-02)

Parts Required:

Oil pan gasket

Hot Tip:

Drain the engine oil first to prevent a mess when dropping the pan.

Performance Gain:

Longer engine life leak

Complementary Modification:

Change engine oil pump while the pan is down.

If you have a leak from your lower oil pan you can fix it yourself and it won't take you much time. Mercedes Benz, like most European manufacturers, use a two stage oil pan. There is an upper oil pan and a lower oil pan. The lower oil pan allows you to change the oil pump and remove the timing case cover without having to drop the engine oil pan. That job is not impossible but it is a lot more involved. In this tech article we will go over all the steps to remove the lower oil pan.

In order to service your lower oil pan you are going to have to lift and support the front axle of you vehicle. See our tech article on jacking up and supporting your vehicle.

Drop the lower engine splash shield. See our tech article on lower splash shield removal for further instructions. This will give you access to the lower oil pan.

Drain the engine oil.
Figure 1

Drain the engine oil. See our tech article on oil and filter change for further instructions. This photo shows a 13mm wrench on the oil drain plug.

This photo illustrates looking up and the oil pan from the floor.
Figure 2

This photo illustrates looking up and the oil pan from the floor. Remove the one longer 5mm Allen head fastener (green arrow) that holds the transmission oil cooler line to a bracket and flex the line slightly out of your way.

Remove the twenty 5mm Allen head fasteners that hold the lower oil pan on the upper oil pan.
Figure 3

Remove the twenty 5mm Allen head fasteners that hold the lower oil pan on the upper oil pan.

ThisPicture illustrates the front of the oil pan below the crankshaft pulley.
Figure 4

ThisPicture illustrates the front of the oil pan below the crankshaft pulley. From a safe corner of the engine you can use a flathead screwdriver or pry bar to lever off the lower oil pan from the upper oil pan. Have a drain pan underneath ready to catch any oil that may spill out.

I always leave one corner fastener in so the pan does not fall down when separated.
Figure 5

I always leave one corner fastener in so the pan does not fall down when separated.

While holding the pan up unclip the wiring (green arrows) that runs in a guide at the back of the pan.
Figure 6

While holding the pan up unclip the wiring (green arrows) that runs in a guide at the back of the pan. Remove the pan and allow it to finish draining in the drain pan you are using. Installation is the reverse of the removal steps. Position the oil pan gasket on the drain pan or the block. You can use silicone to make a gasket all around the perimeter of the oil pan or you can use a small amount of silicone to hold the gasket on. Thread in the fasteners and tighten them down. Use the long fastener to pass through the bracket that holds on the transmission cooler line.

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Comments and Suggestions:
Robert Comments: No torque specs...
I always torque,when the specs are given!
July 22, 2016
  Followup from the Pelican Staff: I don’t have that info.

I would grab a repair manual. It will have the procedure, special tools and torque specs.

Give our parts specialists a call at 1-888-280-7799. - Nick at Pelican Parts
 

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