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w124 oil pressure sender / sensor

Discussion in 'Engine, Drivetrain, Fuel and Exhaust' started by tjamesbo, Oct 21, 2012.

  1. tjamesbo

    tjamesbo Senior Member

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    Your Mercedes:
    1999 CLK430, 2007 VITO 3.0V6 , W124's (1994 320TE , 1993 220TE ) , 07 2.5 X-Type
    I am going to test the Oil pressure Sender on the 124
    I think I have located it by and above the Oil Filter Housing
    2 Questions
    Is this it ?? see piccie below

    [​IMG]

    How does the connector come off ? / unplug (so that i can test the resistance of the sender and substitute a resistor to check the gauge ) pull / twist dont want to break it !
    Thanks Boyd
     
    Last edited: Oct 21, 2012
  2. OP
    tjamesbo

    tjamesbo Senior Member

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    Your Mercedes:
    1999 CLK430, 2007 VITO 3.0V6 , W124's (1994 320TE , 1993 220TE ) , 07 2.5 X-Type
    Also any Ideas why there is a connector at the front underneath the front cover that isnt connected anywhere ????
    here it is [​IMG]
    Thanks
     
  3. robparker

    robparker Senior Member Authorised Forum Supporter

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  4. wireman

    wireman Senior Member

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    Your Mercedes:
    nice 201 2.5D 1993 & very nice 129 SL500 1994
    May be of use 102/103/602/603 engines.

    Resistances of pressure sensor as a function
    of oil pressure.
    Pressure (bar) 0 1 2 3
    Resistance approx. 10 69 129 184
     
  5. OP
    tjamesbo

    tjamesbo Senior Member

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    Your Mercedes:
    1999 CLK430, 2007 VITO 3.0V6 , W124's (1994 320TE , 1993 220TE ) , 07 2.5 X-Type
    Thanks I picked that up off one of your older posts I think :), ....... But mine is the 111 Engine in the 93 220TE :confused: so are those still the values ? I just bought the resistors you mentioned off Ebay last week
     
  6. wireman

    wireman Senior Member

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    Your Mercedes:
    nice 201 2.5D 1993 & very nice 129 SL500 1994
    Don't know for sure, the numbers are for all engines in 1992 US 190's but if it looks like the Ebay item its just like the ones on my 124 and 201.

    Replacing the sender with the fixed resistors will test the indicator not the sender.

    Why do you suspect troubles with your sender? and what is your oil pressure gauge doing wrong?
     
  7. OP
    tjamesbo

    tjamesbo Senior Member

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    Your Mercedes:
    1999 CLK430, 2007 VITO 3.0V6 , W124's (1994 320TE , 1993 220TE ) , 07 2.5 X-Type
    As well as reading low it sometimes fluctuates quite a bit eg occasionally goes up before going down when deaccelerating
    Always on 3 at start up but once hot can be virtually zero at idle
     
  8. television

    television Always remembered RIP

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    That is a faulty sender identical to my 140, mine failed during an oil change
     
  9. wireman

    wireman Senior Member

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    Your Mercedes:
    nice 201 2.5D 1993 & very nice 129 SL500 1994
    +1 for dead sender, or a possible wire fault near to its connection, shorting to earth was the reason on my 124, fixed by washing off the grime from the senders terminal and tidying up the wires and connector.
     
    Last edited: Oct 23, 2012
  10. OP
    tjamesbo

    tjamesbo Senior Member

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    Your Mercedes:
    1999 CLK430, 2007 VITO 3.0V6 , W124's (1994 320TE , 1993 220TE ) , 07 2.5 X-Type
    I have located it here is a location piccie[​IMG]

    Next step to clean and degrease and remove connector :)
     
  11. OP
    tjamesbo

    tjamesbo Senior Member

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    Your Mercedes:
    1999 CLK430, 2007 VITO 3.0V6 , W124's (1994 320TE , 1993 220TE ) , 07 2.5 X-Type
    Here is a close up degreased wire is in good condition to loom I have pulled the top cap off the connector and have now removed connector ( pulls off ) [​IMG]
    Now just got to wire up the resistors and check the guage end first
     
    Last edited: Oct 25, 2012
  12. OP
    tjamesbo

    tjamesbo Senior Member

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    Your Mercedes:
    1999 CLK430, 2007 VITO 3.0V6 , W124's (1994 320TE , 1993 220TE ) , 07 2.5 X-Type
    OK the resistors have gone onto the wire, and other end connected to earth results as follows;
    10ohms = O bar Checks out OK
    180 Ohms =3 Bar Checks out OK
    68 ohms = 1.5Bar previous posts suggest this should be 2 Bar although check resistances were not quoted for the M111 engine

    All readings Rock steady and same from ignition on to running no variation with revs so Voltage obviously stable .

    Conclusion on basis of above favours the replacement of the Sender Now
    £35 from Euromerc is favourite .
    Access to the 17mm Nut at the back of sender is very poor :(:(:(even a stubby wrench has only about 1cm movement . I have ordered some crows feet wrenches . Hopefully these will fit otherwise I am going to have a job cracking it off ( and tightening the new one ):( .
    Should I put some sealant on the top part of the thread for the new one when it goes in
     
    Last edited: Oct 25, 2012
  13. OP
    tjamesbo

    tjamesbo Senior Member

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    Your Mercedes:
    1999 CLK430, 2007 VITO 3.0V6 , W124's (1994 320TE , 1993 220TE ) , 07 2.5 X-Type
    New Sender from Euromerc £35 , half the price of the MB Dealer and with the help of a 17mm Crowsfoot ( preferably a thin one ) The old is off and the new is on
    What a Difference :):):) 3 Bar all the time even after an italian Tune Up it only dropped to about 2.5 Bar At idle in Drive .
    So the Engine is good for another 100K :wink: Jus got to sort out next
    Steering Play
    Rattley Cat
    Front Wings and Rear Arch ( next summer )
    Boyd
     
  14. syncropaddy

    syncropaddy Senior Member

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    .... too many cars!
    Total bitch of a job removing that sender!
     

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