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  #1  
Old 01-19-2000, 10:34 PM
Josh
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I could not find anything in the archivies similar to my problem.
'84 190E. I have had the car for about 7 months, in which time the gage has almost always read 3 bar, occasionally dropping to 2 .something on hot days at idle. The car has been at a repair garage for the past week and a half, with little running (work was suspension). When I started the car this morning tha gage read 3 bar and I did't notice it for the remaining fifty miles. On the way home this afternoon after driving approximetly 5 miles and setting at a light the gage was reading a little over zero. I bliped the throttle and the gage responded by raising a little and then dropping. As I pulled away from the light the gage raised with engine revs, reading abouy 2 bar @ 3K rpm, at wich point I would shift gear. I quickly pulled over and checked oil level after a minute, there was plenty. I chanced the remaining 45 mils home, gaged responded the same way, rising with the engine to 2 bar @ 3k rpm and dropping to a little over 0 bar @ idle. What's happening, what tests should I perform? Oil pump?

Thanks in advance
Josh
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  #2  
Old 01-20-2000, 09:57 PM
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Join Date: Mar 1999
Location: Suwanee, GA, USA
Posts: 4,712
The test you need is a manual oil pressure test. The sending unit or the gauge may be bad. Be sure to have it tested. If it is low on oil pressure, you will damage your engine.

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Benzmac:
1981 280GE SWB
1987 16V
ASE CERTIFIED MASTER AUTO TECHNICIAN
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Old 01-20-2000, 10:22 PM
Josh
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Again thank you for your advice Benzmac. Is the manual pressure test the equivelent of taking a direct reading at the sending unit location. BTW wher is the sending unit located?
-Josh
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  #4  
Old 01-20-2000, 11:58 PM
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Join Date: Jan 2000
Location: Indpls.,IN. USA
Posts: 84
Your sending unit is mounted to your oil fiter housing. It is not easy to get to but its the only place to start. I have seen 190s with oil pressure bypass valves stuck in the open position. These usually result from coolant in the oil. Look carefully at the condition of your oil, it might also be helpful to remove and cut open your oil filter to look for clues. As far as your oil pump failing, its not likely. The oil pump in a 190 is driven off of the crankshaft nose and the pump is built into the front cover.
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