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+--- Thread: where is the oil pressure switch OM617.912 (/showthread.php?tid=1436)
where is the oil pressure switch OM617.912 - BRABUS - 06-15-2010
Hello
I think my oil pressure switch is stopped working,
Where can i locate it on the engine?
The engine is a 617.912 non turbo(83 w123 300D)
RE: where is the oil pressure switch OM617.912 - ForcedInduction - 06-15-2010
There is no switch.
RE: where is the oil pressure switch OM617.912 - BRABUS - 06-15-2010
(06-15-2010, 06:02 PM)ForcedInduction There is no switch.
? what is giving the oil pressure gauge its reading signal then? oil line straight to the gauge?
RE: where is the oil pressure switch OM617.912 - winmutt - 06-15-2010
(06-15-2010, 06:18 PM)BRABUS(06-15-2010, 06:02 PM)ForcedInduction There is no switch.
? what is giving the oil pressure gauge its reading signal then? oil line straight to the gauge?
Yup. And rarely fails without a massive leak.
RE: where is the oil pressure switch OM617.912 - BRABUS - 06-15-2010
this oil hose. is it connected to the downside of the oil filter housing?
Can hook up another oil line there to feed the turbo oil?
Best regards
RE: where is the oil pressure switch OM617.912 - Alastair E - 06-20-2010
Yes, this is where you can take off an oil supply for a turbo....
But, the turbo motor has a pipe fitted somewhere already anyway--why add another!
Cant fit Tubo to N/A engine--So they say...N/A engine just Isnt strong enough--so they say...
However, its been done with varying degrees of success. There were even kits supplied a good few years ago--I was in contact with a guy some time ago who had one fitted, apparently even 'approved' by M.B, so he said--Not sure how though....
Main issues are that the Pistons of N/A engine have no oil-jet cooling or the cast-in oil cooling channels in the crown, so can become overheated, they are also not as 'robust' as the correct pistons.
Other engine differences include sodium-filled exhaust-valves and different pre-chambers for the Turbo motor
If you're going to add Turbo, best add an EGR gauge upstream of it as well and keep those EGT temps down. Dont go much above 10 PSI boost, and likewise, dont adjust pump fuelling too much....
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RE: where is the oil pressure switch OM617.912 - rdirtycar - 07-02-2010
wouldn't adding a tee here throw off your oil pressure reading?
RE: where is the oil pressure switch OM617.912 - Captain America - 07-09-2010
Not unless there was a huge leak... Oil pressure should be the same everywhere except after the restrictor at the turbo oil inlet. The only thing that would cause an incorrect reading is if the Tee was inline to the gauge.... If the "thing" the Tee was feeding was using more oil than the guage line could supply, then you would see the pressure drop on the gauge.
RE: where is the oil pressure switch OM617.912 - rdirtycar - 07-10-2010
(07-09-2010, 01:38 PM)Captain America Not unless there was a huge leak... Oil pressure should be the same everywhere except after the restrictor at the turbo oil inlet. The only thing that would cause an incorrect reading is if the Tee was inline to the gauge.... If the "thing" the Tee was feeding was using more oil than the guage line could supply, then you would see the pressure drop on the gauge.
Concur? Concur.
RE: where is the oil pressure switch OM617.912 - ForcedInduction - 07-10-2010
Yep. Hydraulics means pressure is the same everywhere, measuring after a restriction will change the pressure and adding a consumer to the line won't do much of anything to the display. The flow through the T would have to be almost open ended to make a impact on the dash gauge.
Also the dash gauge displays less than half of the systems regulated pressure (7bar), about the only thing that could flow enough to lower the displayed pressure while driving is a broken oil cooler hose.