Pelican Parts
Mercedes-Benz Parts Catalog Accessories Catalog Mercedes-Benz How To Articles Mercedes-Benz Tech Forums
Call Pelican Parts at 888-280-7799
View Recent Cars  |Shopping Cart Cart | Project List | Order Status | Help
 >  >
Swapping Out Your Mercedes-Benz Oil Pressure Sender
 
Bookmark and Share

Pelican Technical Article:

Swapping Out Your Mercedes-Benz Oil Pressure Sender

Steve Vernon

Time:

1 hour1 hr

Tab:

$25

Talent:

*

Tools:

17mm wrench,

Applicable Models:

Mercedes-Benz W126 (1981-91)

Parts Required:

Oil Pressure Sender

Hot Tip:

Be careful removing the switch

Performance Gain:

Peace of mind over your oil pressure

Complementary Modification:

Oil and Filter

Proper oil pressure is crucial to your engine's life. Your oil is the life blood of the engine and must be maintained at proper temperatures and pressures for the engine to function properly and last. At operating temperature the oil pressure at idle may drop to 0.3 bar and immediately rise during increase engine speed to reach a minimum of 3 bar at 3000rpm.

The gauge in the instrument cluster gets its signal from the oil pressure transmitter located on the lower part of the oil filter housing. If you are having unusual or no readings from the gauge the first and easiest thing to replace is your oil pressure sender.

Depending on how comfortable you are working under your car will depend on whether or not you wan to lift it. The sender is located on the lower part of the oil filter housing directly behind the air pump and it can be a very tight fit. Whether you lift the car or not make sure you work on a cool engine to prevent burning yourself.

The sender has a single electrical pole/connector that needs to be removed and while it simply pulls straight off you want to make sure that you don't damage it or break one of the hoses to the air pump when removing it. With the connector off use a 17mm wrench and unscrew the sender.

You can do this without draining the oil from the car but be prepared for some oil to come out while replacing the unit. Simply remove the old unit, screw in the new one and plug the connector back on.

The sender (red arrow) is located on the lower part of the oil filter housing directly behind the air pump and it can be a very tight fit.
Figure 1

The sender (red arrow) is located on the lower part of the oil filter housing directly behind the air pump and it can be a very tight fit.

This photo illustrates the electrical connector (yellow arrow) and where the sender (red arrow) screws into the oil filter housing.
Figure 2

This photo illustrates the electrical connector (yellow arrow) and where the sender (red arrow) screws into the oil filter housing. Pull the electrical connector (yellow arrow) straight back and off.

With the connector off (yellow arrow) use a 17mm wrench (red arrow) and unscrew the sender.
Figure 3

With the connector off (yellow arrow) use a 17mm wrench (red arrow) and unscrew the sender. Note: the air pump has been removed to give you a better view of the area you will be working in.

This is what the sender looks like off the engine.
Figure 4

This is what the sender looks like off the engine.

This photo illustrates the opening (red arrow) in the oil filter housing that the sender screws into.
Figure 5

This photo illustrates the opening (red arrow) in the oil filter housing that the sender screws into. Note: the air pump has been removed to give you a better view of the area you will be working in.

Bookmark and Share
Comments and Suggestions:
92 Dodge Dakota Mercedes-Benz 300sd Comments: How can I get the fittings to put a manual oil pressure gauge on my 300sd Mercedes engine
February 7, 2017
  Followup from the Pelican Staff: I was under the impression that the 300SD did have a mechanical oil pressure gauge? - Casey at Pelican Parts  
Don Comments: 1980 Mercedes 450 SL.
On the block just below the left valve cover
Close to firewall is a fitting screwed into tho block.
A tube comes from it, threw the firewall and connects to oil pressure guage. Sending unit?
January 26, 2017
  Followup from the Pelican Staff: Can you share a photo of the part and the connections? - Nick at Pelican Parts  

QUICK LINKS
About Us
Careers
Pelican Parts, Inc.
1600 240th Street
Harbor City, CA 90710
Order Online or Call:
888-280-7799
CONNECT WITH US
NEWSLETTER
Sign Up for Pelican Pit Stop News & Special Offers
Page last updated: Sun 2/26/2017 02:25:43 AM