|
|
|
#1
|
|||
|
|||
Oil pressure
Hey guys I have a question about the oil pressure when I give the car gas the oil pressure jumps up I've 3 and as soon as I let all the way off it drops down to 1 is this normal?
__________________
1981 Mercedes 300SD Turbo diesel -- 245,000 2006 Honda CRV -- 53,000 |
#2
|
||||
|
||||
Perfectly. The actual oil pressure is well above "3", but the gauge tops out at 3. The best guess we've got around here is that the engineers realized that the low end of the gauge was the most important, and so in the limited dashboard space they focused in on that range.
It's acceptable (depending on year, model, and which edition of the owners manual you get) for it to drop down to 0.2-0.5 bar after a long, hot, hard climb up a 10% grade for half an hour when you idle at the very top and the oil is boiling hot and thin. Under more "normal" circumstances, 1-1.5 bar is a typical idle and anything over 1,000-1500RPM should result in an instant "max out" at 3 bar. Actual oil pressure at road speed is somewhere in the 6-10 bar range if I remember correctly, but I could be wrong. If the gauge had had that many numbers on it, nobody would even know when it was too low. |
#3
|
|||
|
|||
Great thanks so much for your detailed response. I am selling my benz and the guy that came to look at it last night said that as soon as you let off the gas it should slowly decrease in oil pressure instead of dropping straight to 1-1.5.. He then continued to say that its prolly a loose valve thats causing this.
In my honest opinion the guy was a bit of a nut case in multiple ways. What do you think of this? Edit.. Would it help if I got a video?
__________________
1981 Mercedes 300SD Turbo diesel -- 245,000 2006 Honda CRV -- 53,000 |
#4
|
||||
|
||||
Quote:
__________________
Thanks, Mark in NC "Spark plugs?...We don't need no stinking spark plugs!" 1985 300SD "Der Silberne Schlitten" 420,000 mi Wish these were diesel: 2003 Ford Club Wagon 130,000 mi |
#5
|
||||
|
||||
I hope your advertising includes the usual ridiculous claims like the motor will do a million miles on WVO !!
__________________
Grumpy Old Diesel Owners Club group I no longer question authority, I annoy authority. More effect, less effort.... 1967 230-6 auto parts car. rust bucket. 1980 300D now parts car 800k miles 1984 300D 500k miles 1987 250td 160k miles English import 2001 jeep turbo diesel 130k miles 1998 jeep tdi ~ followed me home. Needs a turbo. 1968 Ford F750 truck. 6-354 diesel conversion. Other toys ~J.D.,Cat & GM ~ mainly earth moving |
#6
|
|||
|
|||
Quote:
Where else would you list it besides craigslist and here? Quote:
__________________
1981 Mercedes 300SD Turbo diesel -- 245,000 2006 Honda CRV -- 53,000 |
#7
|
||||
|
||||
Quote:
I understand...unless you advertise it locally in the paper ($$) it sounds like you have it marketed. Good Luck!
__________________
Thanks, Mark in NC "Spark plugs?...We don't need no stinking spark plugs!" 1985 300SD "Der Silberne Schlitten" 420,000 mi Wish these were diesel: 2003 Ford Club Wagon 130,000 mi |
#8
|
|||
|
|||
The oil pressure is normal, the guy just doesn`t know anything about mercedes. NEXT.
Do you have it listed in the Santa Cruz CL? large WVO crowd over here that should snapp it up. Since you Live here in the Bay Area, why don`t you go to PNP and pull an alternator. they will give you a cross reference as to which cars used the same one. think they are around $35. from where you are, the yard in Fremont probably the closest on Mowery rd. off 880. Charlie
__________________
there were three HP ratings on the OM616... 1) Not much power 2) Even less power 3) Not nearly enough power!! 240D w/auto Anyone that thinks a 240D is slow drives too fast. 80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works |
#9
|
||||
|
||||
In a turbo engine, if the oil pressure drops at idle, it will often drop right to 1.5bar where the piston spray nozzles close, quickly. The spray nozzles use a bit of oil volume.
__________________
Gone to the dark side - Jeff |
#10
|
|||
|
|||
The piston spray nozzles cut off during idle ?
What controls them ? Where is that located ?
__________________
1980 240d , chain elongation, cam marks reference: http://www.peachparts.com/shopforum/diesel-discussion/10414-help-i-need-check-stretch.html http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html evap fin cleaning: http://www.peachparts.com/shopforum/diesel-discussion/156207-photo-step-step-post-showing-w123-evaporator-removal-1983-240d-1982-300td.html?highlight=evaporator A/C thread http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html |
#11
|
||||
|
||||
Quote:
One way you could implement this is by feeding the the squirters with a check valve that opened at 1.5 bar. Dead simple, keeps the bearings from starving if oil falls off for some reason as well. No idea if this is the actual system or not.
__________________
CC: NSA All things are burning, know this and be released. 82 Benz 240 D, Kuan Yin 12 Ford Escape 4wd You're four times It's hard to more likely to concentrate on have an accident two things when you're on at the same time. a cell phone. www.kiva.org It's not like there's anything wrong with feeling good, is there? Last edited by moon161; 02-28-2011 at 02:41 PM. |
#12
|
||||
|
||||
RTFM.
__________________
http://superturbodiesel.com/images/sig.04.10.jpg 1995 E420 Schwarz 1995 E300 Weiss #1987 300D Sturmmachine #1991 300D Nearly Perfect #1994 E320 Cabriolet #1995 E320 Touring #1985 300D Sedan OBK #42 |
#13
|
|||
|
|||
I have never seen anything in my reading which suggested that the spray nozzles quit spraying at idle...
Did I miss something is the question..... ?????
__________________
1980 240d , chain elongation, cam marks reference: http://www.peachparts.com/shopforum/showthread.php?threadid=10414 http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html evap fin cleaning: http://www.peachparts.com/shopforum/diesel-discussion/156207-photo-step-step-post-showing-w123-evaporator-removal-1983-240d-1982-300td.html?highlight=evaporator A/C thread http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html |
#14
|
||||
|
||||
Yes, the spray nozzles have a pressure valve in them that closes ~1.5bar to maintain better oil flow to other areas at low pressure (and presumably low RPM).
__________________
Gone to the dark side - Jeff |
#15
|
||||
|
||||
NO
Quote:
Two common issues: #1. The oil filter dip tube O-rings are rock hard/leaking. #2. The oil needs changing. I would bet on #1. .
__________________
ASE Master Mechanic asemastermechanic@juno.com Prototype R&D/testing: Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician. Noise Vibration and Harshness (NVH). Dynamometer. Heat exchanger durability. HV-A/C Climate Control. Vehicle build. Fleet Durability Technical Quality Auditor. Automotive Technical Writer 1985 300SD 1983 300D 1984 190D 2003 Volvo V70 2002 Honda Civic https://www.boldegoist.com/ |
Bookmarks |
Thread Tools | |
Display Modes | |
|
|