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post #5631 of 5651 (permalink) Old 04-03-2019, 11:21 AM
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Date registered: Jul 2018
Vehicle: 1989 190e 2.6
Location: Alexandria, VA
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Originally Posted by jzchen View Post
Did you change oil brands/viscosity? Lower than 1 BAR is normal at hot idle, noted in manual IIRC, but should immediately rise upon accelerating, also noted IIRC. First verify oil level is fine. Time that happened to me was when gauge was leaking oil out from connection at the instrument cluster on the W123. Of course that time my wife was learning to drive and was wondering why it was getting slippery underneath in the footwell... Oil level was low and pressure wouldnít rise up to maximum rapidly.
Yup, I've seen the same. Mine hovers around .5bar at hot idle. Instantly rising with any throttle application. Pegs at 3bar under heavy accel and around 2.8/2.9 until light pressure.
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post #5632 of 5651 (permalink) Old 04-04-2019, 05:24 PM
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Date registered: Dec 2012
Vehicle: 89 190E2.6- 5-speed Manual, 95 E320 Sportsline-sold, 2001 E320 4matic Wagon-sold
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I've driven W115, W201, W124 cars since almost new for many years. The Oil gauges on all these models seemed to settle above 2 bar at idle. The 124 was still like that when I sold it at 145K miles at age 20. Still wondering why the pressure drops as the engine ages....
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post #5633 of 5651 (permalink) Old 04-04-2019, 06:38 PM
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Date registered: Jan 2011
Vehicle: '85 W201.601; '13 X204.651
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Originally Posted by dolucasi View Post
I'm not sure what causes the oil pressure on these engines when they age.
Normal wear and lack of resistance in the worn surfaces through which the oil flows.
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post #5634 of 5651 (permalink) Old 04-04-2019, 06:47 PM
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Do you mean added resistance form the pump (which is at one end of the engine) to the other end where the filter and pressure sender is?
Is the pump actually sitting in the front or way in the back? The chain is up front for sure.
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post #5635 of 5651 (permalink) Old 04-04-2019, 08:17 PM
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No. The oil pump located in the crankcase, picks up the crankcase oil and pumps it through the various oil galleys which include all the crankshaft bearings, camshaft bearings and valve lifters. The resistance through those closely machined parts is what determines the pressure. The gauge is just an indicator of the pressure to those very important parts that require lubrication to minimize wear, but they do wear. As they wear, more and more oil flows through those close fitting parts leaking back to the crankcase where the pump picks it up again and recirculates it. As the bearing surfaces wear the resistance offered when newly fitted, lessens. The pump also can wear but as long as the pressure required by any lifters exists, all is well, as long as there is 'some' uniform resistance throughout the pressurized system. Actually, volume of oil circulating is more important than pressure, except for engines with hydraulic valve lifters (as the diesels).
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post #5636 of 5651 (permalink) Old 04-04-2019, 09:07 PM
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Date registered: Dec 2012
Vehicle: 89 190E2.6- 5-speed Manual, 95 E320 Sportsline-sold, 2001 E320 4matic Wagon-sold
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OK, so the main issue must be the bearings (both crank/camshaft) letting more oil flow thru and the pump getting somewhat weaker as its moving parts must also wear causing some leak internal to the pump. I can not think of any other fitting that allows more flow in a significant way, but then again not too familiar with the bottom end of the engine.

Curious, does the engine need to come out for the oil pump to be serviced? Sounds like it. I'm sitting at 1.5bar when hot at 195K miles, so probably OK for the time being, not too concerned, just curious.

Thanks for the explanation

- Cheers!
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post #5637 of 5651 (permalink) Old 04-05-2019, 02:55 AM
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Date registered: Jul 2010
Vehicle: '85 300D Turbo, '91 420SEL, '92 190E 2.6, '09 C350, '12 E63 Wagon
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What did you do to your Benz today?

Quote:
Originally Posted by Bob338 View Post
No. The oil pump located in the crankcase, picks up the crankcase oil and pumps it through the various oil galleys which include all the crankshaft bearings, camshaft bearings and valve lifters. The resistance through those closely machined parts is what determines the pressure. The gauge is just an indicator of the pressure to those very important parts that require lubrication to minimize wear, but they do wear. As they wear, more and more oil flows through those close fitting parts leaking back to the crankcase where the pump picks it up again and recirculates it. As the bearing surfaces wear the resistance offered when newly fitted, lessens. The pump also can wear but as long as the pressure required by any lifters exists, all is well, as long as there is 'some' uniform resistance throughout the pressurized system. Actually, volume of oil circulating is more important than pressure, except for engines with hydraulic valve lifters (as the diesels).


To me, oil pressure is like blood pressure. When I was in college, we had to take the blood pressure of our teacherís assistant. Unfortunately for me, he was a long distance runner. I had no idea bp could be so low. Got the question wrong because I smudged the numbers. Iíve seen it below 1 BAR, and we have somewhat relatively low mileage ones, the M103 had tons of work done around 90k miles and still has trouble 30k miles later. BUT nothing about scored anything, Iím assuming signs of bad/low oil pressure. Currently running Mobil 1 0W-40. This stuff flows so well I get an oil light even though the level is still within the range on the dipstick! I have to keep the level above the half way point near the max mark to keep the oil light off. Not in town until later today to quote the manual....
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post #5638 of 5651 (permalink) Old 04-05-2019, 05:44 PM
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I opened the manual and found the section on oil pressure! 0.3 BAR is a fraction of the pressure of concern.....

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post #5639 of 5651 (permalink) Old 04-14-2019, 07:17 PM
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Date registered: Jul 2018
Vehicle: 1989 190e 2.6
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Replaced my power steering pump and aux fan. I have a new hatred for Benz engineers. Should have just removed everything, radiator, condenser etc but that seemed excessive.....it wasn't.
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post #5640 of 5651 (permalink) Old 04-18-2019, 11:07 AM
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Date registered: Oct 2007
Vehicle: 89 190E 2.6 x2
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My daily driver 2.6 suffered a head gasket failure last week. (Coolant mixed in oil)
Car has 228K on it now. The head gasket was replaced 19 yrs ago at 118K, but Iím not sure if it was the reinforced one.
Myself and the previous owner both only used Zerex G05, so I figured itís just more of an age thing.

I think the local machine shop has a freshly machined 89 2.6 cylinder head for sale, so Iíll pick that up. Going to order an Elring head gasket set, plus replace the water pump, belt tensioner and fuel injectors while I have it apart.

The ironic thing is the car just turned 30 yrs old this month....

#1.1989 190E 2.6 355 Diamond Blue Metallic, lots of euro goodies, Borbet wheels, Koni shocks, Brabus W124 springs

#2.1989 190E 2.6 877 Blue Green metallic, Euro headlights w/ HID projector retrofit, 15" AMG monoblock wheels, AMG replica body kit, rear lip spoiler

#3 1992 190E 2.6 888 Teal Blue Metallic, donor car parted out.
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