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Oil Pan Gasket Replacement
 
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Pelican Technical Article:

Oil Pan Gasket Replacement

Steve Vernon

Time:

1 hour1 hr

Tab:

$40

Talent:

*

Tools:

5mm Allen, 10mm wrench paper towels

Applicable Models:

Mercedes-Benz W123 (1977-85)

Parts Required:

Gasket

Hot Tip:

Label the bolts, they are different lengths

Performance Gain:

No oil stains on your driveway

Complementary Modification:

Oil and filter change

As the W123's age the oil pan can become a constant source of oil leaks and an oil leak on the pan will lead to the entire underside of the motor being covered with dirt, oil and grime. If you are starting to see the tell-tale signs of a few small spots of oil on your driveway after you have parked, do not just keep adding oil to keep up with the leak, fix the problem properly with help from this article.

You will need to drain the oil out of the pan and unless you just preformed oil and filter change now is a great time to include this job as well since you are half way there. When working with used oil always catch and dispose of the used motor oil; NEVER pour it on the ground, into the street or open sewers; not only is that bad for the planet, it is illegal. Most local oil change places will take you old oil and filter for no charge.

You will need to safely jack the car up and place it on jack stands, please see our article on safely jacking up and supporting your car.

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.

Our vehicle may vary slightly from yours as Mercedes redesigned systems and sub-system as the models developed over the years. 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 leave your vehicle information.

Begin by draining the oil from the pan; now would also be a good time to perform oil and filter change.
Figure 1

Begin by draining the oil from the pan; now would also be a good time to perform oil and filter change. Please see our article on oil and filter change for additional assistance.

If you have let the oil leak go a long time the pan and lower motor can be really covered with oil, dirt and grime, and while the nineteen 5mm Allen bolts are not torqued to a high spec make sure to clean the bolt heads; you do not want to strip the heads of these bolts out as they are a pain to remove once the head is stripped (red arrow).
Figure 2

If you have let the oil leak go a long time the pan and lower motor can be really covered with oil, dirt and grime, and while the nineteen 5mm Allen bolts are not torqued to a high spec make sure to clean the bolt heads; you do not want to strip the heads of these bolts out as they are a pain to remove once the head is stripped (red arrow).

Use a 5mm Allen and remove the 19 bolts keeping track as some of them are different lengths.
Figure 3

Use a 5mm Allen and remove the 19 bolts keeping track as some of them are different lengths. Depending on how your vehicle is equipped you may have a bracket on the right side of the motor that the bolts go through; you will need to use a 10mm wrench to hold the nuts on top of these bolts (red arrows). There may also be a transmission line bracket attached to each side of the pan (yellow arrow). Each of the bolts should have a small washer with them so make sure you find and reuse these washers.

The transmission lines on each side will have spacers (red arrow) so the lines can clear the pan, make sure to keep and reinstall these.
Figure 4

The transmission lines on each side will have spacers (red arrow) so the lines can clear the pan, make sure to keep and reinstall these.

Leave a bolt loosely in each corner until you are ready to remove the pan as once all of the bolts are removed the pan will drop.
Figure 5

Leave a bolt loosely in each corner until you are ready to remove the pan as once all of the bolts are removed the pan will drop. Even though you have drained the oil there will still be some in the pan, so use care.

If the gasket is stuck to the block make sure to remove it (red arrow) and clean the mounting surface.
Figure 6

If the gasket is stuck to the block make sure to remove it (red arrow) and clean the mounting surface.

Clean the mounting surface of the pan really well.
Figure 7

Clean the mounting surface of the pan really well. If everything is clean there is absolutely no need to use RTV. Lay the new gasket over the pan and use a bolt or two help keep it in place. Installation is the reverse of removal and remember to torque the bolts in a crisscross pattern.


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