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#1
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300sd Oil pressure switch leak
Hi and thanks for helping.
I have a 1984 300SD with an oil leak coming from the oil pressure switch. Being new to working on MB, I am unfamiliar with how the oil pressure switch works. I took the wire off the switch and oil comes out of the pin on the switch. Is this normal???? The wire has a connector that when it is on the switch it seems loose and does not seal tightly. That is where the leak is from. Do I need a new switch or a new wire harness? Please help, thanks. |
#2
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needs a new switch.
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83 300SD Dark Silver Dark brown inside |
#3
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Can please explain the connection?
is the oil pressure switch out put only an electric signal and NOT oil pressure? Thanks. |
#4
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Yes. On the 126 SD's the sender puts out an electric current (or I think more accurately, provides a variably resistant ground) not oil.
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1977 300d 70k--sold 08 1985 300TD 185k+ 1984 307d 126k--sold 8/03 1985 409d 65k--sold 06 1984 300SD 315k--daughter's car 1979 300SD 122k--sold 2/11 1999 Fuso FG Expedition Camper 1993 GMC Sierra 6.5 TD 4x4 1982 Bluebird Wanderlodge CAT 3208--Sold 2/13 |
#5
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THanks, that is how other oil sensors I've seen worked.
Now why this diesel one has a hole in the pin is an interesting question. There must be a diaphragm that gives way and MB thought this would be a good way to identify that the sensor was bad. (How about looking at the gauge?) Time to order up a new switch. |
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