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  #1  
Old 06-28-2008, 07:11 PM
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Why no oil preasure?

While on my way to look at a 300SDL my 300D quit. It's like it knew I might replace it. There was a slight noise that cought my attention then 30 seconds later the engine quit. I pulled over and it restarted but with no oil preasure so I shut it off. I think the noise came from around the turbo area. Can the oil preasure drop if the turbo goes bad?
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Old 06-28-2008, 08:33 PM
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yes, the turbo oil line can dump all your oil out on the ground... no oil in the pan, no oil pressure...
how is the oil level?
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  #3  
Old 06-28-2008, 08:47 PM
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The oil level was good. Thanks
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Old 06-28-2008, 08:59 PM
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It might have thrown the chain that powers the oil pump or the oil pump itself might have let go in some fashion. To inspect the chain etc the lower front portion of the oil pan has to be removed. Check the archives for pictures and information. Needless to say do not start this engine up before finding what is wrong.
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Old 06-28-2008, 09:36 PM
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A messy way to confirm the oil pump is engaged is to crank the engine with the oil pressure sender removed. Oil should squirt in pulses through the fitting.

Sixto
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  #6  
Old 06-29-2008, 01:08 AM
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What year 300D? The W123 models had an oil pressure line, not a sender. The same test can be done, of course. If you try this, have someone hold the STOP lever down or use a remote start switch so the engine cranks but does not fire. If you do not see oil squirting out then the pump is not working.

Jeremy
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  #7  
Old 06-29-2008, 01:43 AM
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or just look at the camshaft oilers.
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Old 06-29-2008, 02:11 AM
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or hook up another pressure gauge?...
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  #9  
Old 06-29-2008, 09:21 AM
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Excelent Advice! Thank You. I will tow the car home today and look.
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  #10  
Old 06-29-2008, 01:35 PM
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Almost forgot. It is an 82 300D
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  #11  
Old 06-29-2008, 01:42 PM
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That car has a mechanical oil pressure gauge. No pressure reading means no pressure.

Replace the filter and report back.

Sixto
87 300D
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  #12  
Old 07-01-2008, 06:20 PM
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I did the filter and it did not improve. That would have been too easy.
My engine manual does not have specific directions for inspecting or replacing the chain. It looks like I have to lift the engine but not remove it. Take off the oil pan and the front cover and replace the chain. I did search the forums but did not find anything specific.
Do these engines shut down when oil preasure drops? My newer diesels have that feature.
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  #13  
Old 07-01-2008, 06:47 PM
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Quote:
Originally Posted by jdr01 View Post
Do these engines shut down when oil preasure drops? My newer diesels have that feature.

I think all engines shut down if the oil pressure drops to 0.
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  #14  
Old 07-01-2008, 06:56 PM
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In a 617 you should be able to drop the lower pan and see if the oil pump sprocket turns with the crankshaft.

Sixto
87 300D
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  #15  
Old 07-01-2008, 07:28 PM
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FWIW Non-turbo 617s have a gear driven oil pump I believe, but the poster's '82 should have a turbo engine, and thus a chain driven pump.
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