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#1
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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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What Would Rudolph Do? 1975 300D, 1975 240D, 1985 300SD, 1997 300D, 2005 E320 , 2006 Toyota Prius |
#2
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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. '95 E300D, 323K |
#3
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Quote:
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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'95 E300D ("Tank") - 231,000 miles '79 240D ("Biscuit") - 197,250 miles (Sold) '83 240D ("Ding-Ding") - 217,000 miles (Death by deer) ______________________________________ "Back off, man. I’m a scientist” ~ Peter Venkman |
#4
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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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84 300D, 82 Volvo 244Gl Diesel |
#5
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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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RIP: 2011 E350 BlueTEC, Schwartz 81k (totaled by uninsured drunk driver) 1964 Unimog 404.1 (wrongfully towed by the city) 1994 E320, Brilliantsilber 208k (transmission shuffled off after sudden catastrophic fluid loss) 1982 300D, Silberblau under a blue repaint 256k (sold for parts) 1995 E320 Polarweiss, 131k (sold for parts) 1995 E300D Polarweiss, 287k (totaled by drunk driver) |
#6
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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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What Would Rudolph Do? 1975 300D, 1975 240D, 1985 300SD, 1997 300D, 2005 E320 , 2006 Toyota Prius |
#7
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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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#8
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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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"Buster" in the '95 Our all-Diesel family 1996 E300D (W210) . .338,000 miles Wife's car 2005 E320 CDI . . 113,000 miles My car Santa Rosa population 176,762 (2022) Total. . . . . . . . . . . . 627,762 "Oh lord won't you buy me a Mercedes Benz." -- Janis Joplin, October 1, 1970 |
#9
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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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Jimmy L. '05 Acura TL 6MT 2001 ML430 My Spare Gone: '95 E300 188K "Batmobile" Texas Unfriendly Black '85 300TD 235K "The Wagon" Texas Friendly White '80 240D 154K "China" Scar engine installed '81 300TD 240K "Smash" '80 240D 230K "The Squash" '81 240D 293K"Scar" Rear ended harder than Elton John |
#10
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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. |
#11
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That's a complete surprise to me...
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-Evan Benz Fleet: 1968 UNIMOG 404.114 1998 E300 2008 E63 Non-Benz Fleet: 1992 Aerostar 1993 MR2 2000 F250 |
#12
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Quote:
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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RIP: 2011 E350 BlueTEC, Schwartz 81k (totaled by uninsured drunk driver) 1964 Unimog 404.1 (wrongfully towed by the city) 1994 E320, Brilliantsilber 208k (transmission shuffled off after sudden catastrophic fluid loss) 1982 300D, Silberblau under a blue repaint 256k (sold for parts) 1995 E320 Polarweiss, 131k (sold for parts) 1995 E300D Polarweiss, 287k (totaled by drunk driver) |
#13
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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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Michael LaFleur '05 E320 CDI - 86,000 miles '86 300SDL - 360,000 miles '85 300SD - 150,000 miles (sold) '89 190D - 120,000 miles (sold) '85 300SD - 317,000 miles (sold) '98 ML320 - 270,000 miles (sold) '75 300D - 170,000 miles (sold) '83 Harley Davidson FLTC (Broken again) :-( '61 Plymouth Valiant - 60k mikes 2004 Papillon (Oliver) 2005 Tzitzu (Griffon) 2009 Welsh Corgi (Buba) |
#14
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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. |
#15
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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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84 300D, 82 Volvo 244Gl Diesel |
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