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  #1  
Old 09-20-2010, 11:31 AM
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OM 606 NA oil pressure at idle?

On the 95 e300 D , it has the 606 NA engine, what should oil pressure be at idle? With foot on gas it jumps up to 3 but after warm at idle it can go just a bit below one. I thought i read on hear that was ok on the 606. But now after searching can't find it.

Can anyone confirm?

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Old 09-20-2010, 12:44 PM
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There is a lot of variation here. Different brands of oil, different mileage levels, etc. I would say that 1 bar is a bit on the low side, my '95 shows just under 2 bar at hot idle. But the oil pressure sender can vary as well. So if I was you I would keep my eye on hot idle pressure to see if it is trending downward, etc. If not, don't worry about it. As long as it jumps up with increased RPM, it's probably OK.

One other thing you can do is to change the O rings on the center "bolt" running through the oil filter cannister at your next oil change.

Let's face it, the options if your oil pressure is very low are daunting, usually involving major work.

Rgds,
Chris W.
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  #3  
Old 09-20-2010, 01:05 PM
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Quote:
Originally Posted by Chris W. View Post
There is a lot of variation here. Different brands of oil, different mileage levels, etc. I would say that 1 bar is a bit on the low side, my '95 shows just under 2 bar at hot idle. But the oil pressure sender can vary as well. So if I was you I would keep my eye on hot idle pressure to see if it is trending downward, etc. If not, don't worry about it. As long as it jumps up with increased RPM, it's probably OK.

One other thing you can do is to change the O rings on the center "bolt" running through the oil filter cannister at your next oil change.

Let's face it, the options if your oil pressure is very low are daunting, usually involving major work.

Rgds,
Chris W.
'95 E300D, 323K
X2

Like Chris, I am at 2 bars at hot idle. I think the important thing is that you are at 3 while driving. ALthough below 1 at idle does sound a little low. What RPMs are you idling at? I think I am usually a little above 500.
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Old 09-20-2010, 04:48 PM
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The Factory Service manual had greater than or equal to 0.3 bar idle with the Engine at operating temp.
The manual also has a proceedure for testing the Oil Pressure; you need nead another gauge and the correct fittings to do so.
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Old 09-20-2010, 07:15 PM
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Just to derail possible spreading of bad info, note that the "bars" on the dash oil gauge are not equal to bar, the unit of pressure. The 0-3 are essentially a score of how the oil pressure is doing for a given situation (idle, revving under load, etc).
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Old 09-20-2010, 08:57 PM
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Originally Posted by okto View Post
Just to derail possible spreading of bad info, note that the "bars" on the dash oil gauge are not equal to bar, the unit of pressure. The 0-3 are essentially a score of how the oil pressure is doing for a given situation (idle, revving under load, etc).
Gee. So i'm below vavg maybe. What is acceptable. .5, .75 , 1 ? I know I caught this lady using gas motor oil
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Old 09-20-2010, 09:08 PM
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The manual can say .3 bar all it wants, but I'd consider less than 1 bar on the gauge itself unacceptable. Start with an oil change, then change out the pressure sender.
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Old 09-20-2010, 09:10 PM
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Most OM606 engines are in W210 cars, which do not have oil pressure gauges, thus data is limited to the 1995 E300D (W124/OM606). As long as the pressure gauge always pins high above about 1300 RPM (I forget the factory number) you are OK. Gasser oil's big disadvantage in a diesel is its limited ability to absorb soot. Depending on how often the PO changed the oil no harm may have been done.
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Old 09-21-2010, 12:54 AM
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Even in the dog days of summer with it sizzling outside, I've never ever had my idle oil pressure drop too much below 1.8 or so. Certainly nothing ever approaching less than 1.
Not sure what this means for you, but that is not the behavior mine exhibits.....
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Old 09-21-2010, 12:44 PM
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Okto, do you have that info about bars being not "bars" of pressure "officially"? I'd like to see it in a MB tech manual or equivalent. Not saying you're wrong, but I'd love some documentation.

Rgds,
Chris W.
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Old 09-21-2010, 12:50 PM
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Quote:
Originally Posted by okto View Post
Just to derail possible spreading of bad info, note that the "bars" on the dash oil gauge are not equal to bar, the unit of pressure. The 0-3 are essentially a score of how the oil pressure is doing for a given situation (idle, revving under load, etc).
That's a complete surprise to me...
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Old 09-21-2010, 01:33 PM
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Originally Posted by Chris W. View Post
okto, do you have that info about bars being not "bars" of pressure "officially"? I'd like to see it in a MB tech manual or equivalent. Not saying you're wrong, but I'd love some documentation.
I can't cite a tech document, but I've witnessed in action. I remember seeing something in the FSM or something about how it determines the needle position. I'll see if I can find that.
So, I guess take it with a grain of salt until we find the docs, since anecdotal tech info is worse than none at all.
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Old 09-21-2010, 02:28 PM
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Why would the FSM tell you that 0.3 bar at idle and 3.0 bar at 3000 rpm if the units of the gauge were not bar?
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  #14  
Old 09-21-2010, 02:36 PM
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Doesn't sound concerning at all to me. I've never owned a 606 but I've got a 616 and a 603 and both of them can be made to exhibit similar behavior. The 616, not so much; it's usually at least 1.2 or so no matter what.

The 603, after a 3 mile 8% uphill grade running at 55-60, goes down to about 0.2 or so the first time it idles at the top of the hill because the oil is so hot and thin. It always comes up under acceleration so I don't worry.

These gauges aren't perfect precision instruments anyway. As long as there's pressure "There" at idle, and "elevated" under acceleration, and "gauge pegged at road speed" -- I think you're okay. The books seem to generally agree; 0.3 is a pretty low threshold and I've never really seen one much below that. If the thing is running and the oil pump is working you're going to have that much.

I wouldn't worry. Sounds perfectly normal based on the literature and experience with similar but not identical engines.
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  #15  
Old 09-22-2010, 01:25 AM
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I think that what is being said is not that the Gauge is not designed to measure in bar. But, that the accuracy of the Gauge is such that it may be pointing to 1 bar but you are actually getting either more or less that 1 bar of actual pressure.

And, if the Gauge and Sending unit combination were accurate when it was new that may not be the case now that it has been in use many years. Even something like Oxidation of the Wire Connector at the Sending Unit can decrease the accuracy of the gauge.

If you are in doubt a resonable quality Mechanical Test gauge should be connected to check the actual pressure.

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