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jcaine
Date registered: Dec 1899
Location:
Vehicle(s):
| diesel oil pressure?
Hi,
what is the operating oil pressure range for a 300 diesel engine?... I installed a proper guage today and the pressure reads 20ish at warm idel and up to 90 at full throttle... does that sound right??? |
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Frans
Date registered: Dec 1899
Location:
Vehicle(s):
| RE: diesel oil pressure?
According to the user manual it should be a minimum of 0.5 bar (7.2 psi) at idle speed when at operating temp. I think the max is 7 bar (101.5 psi), but this needs to be confirmed.
Must say it doesn't sound funny at all, mine about similar. Are you using a mechanical or electronic gauge?
(1 bar = 14.5 psi) |
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amzimmy
Elite Veteran
Date registered: Apr 2006
Location: South Africa/Italy
Vehicle(s): GD300 1981, Alfa GT 3,2 V6, Alfa Brera Q4 3,2 V6.
Posts: 850
| RE: diesel oil pressure?
Maybe a stupid question: where is your pressure pick-up, before or after the filter?
amzimmy  |
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Inkblotz
Expert
Date registered: Apr 2006
Location: Georgia
Vehicle(s): 90 300GD "Thundering Turtle II", w/ 603A turbo
Posts: 3186
| RE: diesel oil pressure?
I have an oil pressure guage on mine it's reading is in BAR. At warm idle 2 bar ( the point .5 that Francois mentioned seams a little low and unhealthy, at speed (full throttle) 7 bar. With the high compression of these engines the oil pressure will reflect how healthy the engine is. Of all the 15 Mercedes diesels I have owned over the years this is what I have found.
1. a low reading at idle means you have some wear in the engine whether it be valves or pistons. A healthy engine is 1.5 to 2.
2. when you accelerate that needle should jump/race to the max mark on the guage, if it goes up slowly then there is a problem or just some wear. My old 240d with 450,000 finally started doing the creap up the dial thing.
3. at start-up the needle should rise quickly to or just above the min mark. (oil is cold and thicker thus more pressure)
Sounds like yours is running perfectly.
Mark
Edited by Inkblotz 5/18/2007 8:15 AM
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jcaine
Date registered: Dec 1899
Location:
Vehicle(s):
| RE: diesel oil pressure?
wow... AWESOME! ....
mechanical guage... |
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