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  #1  
Old 03-20-2008, 08:16 AM
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Location: Gloucestershire England
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oil pressure gauge 1984 280sl euro

Hi

I have a UK (euro) 1984 280sl. The oil pressure gauge reads 1.0 bar when the ignition is on ?

It then sits at 3 when off idle and falls to 2 when idling.

any advice please
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  #2  
Old 03-20-2008, 08:35 AM
t walgamuth's Avatar
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That sounds like very good oil pressure.

Tom W
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  #3  
Old 03-20-2008, 09:40 AM
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Check the wire to the sending unit, located on the oil filter housing to be sure it's not grounding out on something. If that's OK, it sounds like you need a new sending unit.

Obviously, should read zero with key on.
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'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe
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Old 03-20-2008, 09:50 AM
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ok will check all that

thank you for your help
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  #5  
Old 03-20-2008, 09:54 AM
t walgamuth's Avatar
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Quote:
Originally Posted by ctaylor738 View Post
Check the wire to the sending unit, located on the oil filter housing to be sure it's not grounding out on something. If that's OK, it sounds like you need a new sending unit.

Obviously, should read zero with key on.
Yes, obviously. Sorry I missed that.

Tom W
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Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins& six speed; I have had about 35 benzes. I am finishing a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual....I also have a Lotus 7 replica autocrosser with a modified K20 Acura engine.
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  #6  
Old 03-26-2008, 07:17 PM
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I have had this problem with my W123 300 Diesel, but then it was the temperature gauge.

With ignition the indicator/pointer of the gauge went to 20 degrees Celsius. When the engine was at operating temperature the indicator/pointer said 100 degrees Celsius (boiling point).

I know now that when the indicator/pointer of my gauge says 100 degrees Celsius the engine is 20 degrees less, so good operating temperature.

The same with the pointer for my fuel.
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  #7  
Old 03-27-2008, 12:04 AM
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Quote:
Originally Posted by blueshield11 View Post
I have had this problem with my W123 300 Diesel, but then it was the temperature gauge.

With ignition the indicator/pointer of the gauge went to 20 degrees Celsius. When the engine was at operating temperature the indicator/pointer said 100 degrees Celsius (boiling point).

I know now that when the indicator/pointer of my gauge says 100 degrees Celsius the engine is 20 degrees less, so good operating temperature.

The same with the pointer for my fuel.
What is the ambient temperature when it shows 20 C? .....20C?
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  #8  
Old 03-27-2008, 07:40 PM
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With ambient temperature - do you mean the temperature outside? 5 degrees Celsius. It is spring, but temperature does not know that yet.
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