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Hi guys
Im new at forum but I looked from few days in all internet what should be correct pressure of oil in this engine ? I found information in WIS that when engine is hot it not should dropp below 0.3 bar and when engine speed its 3000 rev should be at least 3 bar, My generaly got 0,3bar at idle speed and I have already 3,5bar when 2000 rev around 5 bar when engine is 3000 rev . Im worry about this low pressure at idle speed
maybe some one made a test in his engine and can share this info what he got ? My engine is compleatly rebuild + got new oil pump and Im wondering if all is ok and would like to confirm this ,
If someone could help would be nice
PS Sorry for my bad English Im from Poland
There are many variables with oil pressure and you need professional help to answer your question. I would talk to one of a dealerships master mechanics----whats his advice???
The problem is that I asked many mechanics hear in Poland and nobody is not expired mercedes official document says that it should not dropp below 0,3 when engine is hot and that should be at least 3 bar when engine speed it 3000 rev that is all . Im looking for some one who made a test in another om642 to know what he got because if its also this 0,3 bar at hot engine then may is ok I know few guys tested in OM642 and OM651 but it are 2,2cdi and there they got between 0,7 and 0,9 when engine hot
Hi guys
I found information in WIS that when engine is hot it not should dropp below 0.3 bar and when engine speed its 3000 rev should be at least 3 bar, My generaly got 0,3bar at idle speed and I have already 3,5bar when 2000 rev around 5 bar when engine is 3000 rev .
Do I understand you that according to WIS at idle it should have 0.3 bar. And you at idle have 0.3 bar? If that is true that what's the issue, I see nothing wrong.
Do I understand you that according to WIS at idle it should have 0.3 bar. And you at idle have 0.3 bar? If that is true that what's the issue, I see nothing wrong.
yes but I think wis tell completely minimum of pressure and I'm worry about it like the engine was broken. I would like to know if someone else made the test and what he got because if my have 0.3 bar and if another will get maybe 1.5 bar then in my something is wrong
"When engine oil is at operating temperature, the oil pressure in the idle speed range must not drop below 0.3 bar. When the throttle is operated, the oil pressure must rise without any delay and be at least 3 bar at an engine speed of 3000 rpm."
So at 3000rpm the oil pressure should be at least 3 bar. If no limited interval (with minimum and maximum values) is specified, any pressure greater than 3 bar is accepted.
Just an opinion!
This info I saw in WIS but it sill not tell if its minimum pressure of oi in this engine or if its just correct oil pressure I would like know be sure what the other user of this engine are getting of oil pressure . I have also small update to the case the first toll I made the test was bad and after I made test via 2 different and I got 1 bar of pressure when the engine is hot so hope all is ok then ?
Doubtful many here or for that matter many owners are that meticulous. I am sure there are a few others like you, but by in large, most are not. Most just depend on the Oil Idiot light and just drive, as long as the light is not turned on, who cares.
I saw hear another topic that someone else tried to made the test like me but he never put result of this test . It look that its really not easy to find anyone who made the test or know what is the typical pressure for this engines. For me it look 0.3 bar like a totaly minimum I have 1 bar so its 3 times more like this wah WIS say maybe its enought but prefer to be sure to not kill the engine again it costed me a lot of money to rebuild it for the moment I use 5w40 oil
What caused the last rebuild? These motors are not known for an oil pressure issue. They have more problems with the timing chain, oil cooler leak, etc...
It damaged cod rod bering ( I hope its the correct name in english ) and it was happend by low oil pressure . Now engine got all new parts also the new oil pump
For anybody still interested in om642 oil pressure, here's another data point. I have a freshly rebuilt om642 in a sprinter to which I retrofitted an oil pressure sensor. The oil pressure port is before the oil filter. The guy in the video was reading after the filter. I don't know if his engine was at operating temp.
My numbers: Cold idle 100psi+ Hot idle 55psi Cold highway cruise 100psi+ Hot highway cruise 100psi+
When at operating temp, pessure drops off under 100psi below 1800psi. I've never seen less than 50psi. After shut down the system seems to hold about 15-20psi for quite a while. I'm using 15w40 synthetic oil so your results may vary.
Hello. When choosing a gauge, the operating parameter should be in the middle 1/3rd of the gage. Therefore the oil psi should be something like the attached.
You would still need the m18 adapter and a copper 1/8th inch line to run inside. The plastic lines as re just as king to melt and cause you a damaged engine.
That is pretty impressive pressure tjts is reporting and I still remember my 1998 SL500 showing 0 pressure on factory gauge, when run on synthetic in hot weather.
When there was nothing wrong with it, I think owners complains made MB deleting pressure gauges.
I will wait for tjts reports once his rebuild engine with make some miles
Another reminder, that most of modern MB engines don't have oil pressure sensors and level sensor is the only thing that will give you warning. DON'T IGNORE IT !!!
Most general public consumer autos of any type have gone away from the actual oil pressure gauge due to exactly that, they freak out if its not instantly in the green zone which with oil pressure varies extensively upon temp/time operating/oil type ......
The symulated oil pressure used on a cummins truck always reads in spec, even if the engine was pumping all the oil onto the deck.
09-18-2020, 06:52 AM
