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Old 09-16-2010, 10:36 AM
Join Date: Mar 2010
Location: Jacksonville, Fl
Posts: 8
Om617 erratic oil pressure??

Goodmornin. This morning, as I was driving my 84 300tdt I noticed the oil pressure was shaking erratically so bad that I thaught it was something loose and rattling in the dash until I saw the guage. Anyone know whatcould cause this?? Shoulld I be really concerned about driving it with this condition?? Thank you
'84 MB 300TDT 280,000. My first MB (Owned since 190,000)
'83 MB 300D w/ 165,000

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Old 09-16-2010, 11:20 AM
vstech's Avatar
Join Date: Mar 2006
Location: Mount Holly, NC
Posts: 26,243
yeah. anything odd with the oil pressure and you should be worried.
especially with the true gauges in the tdt... unless you have an 81, it's got an electric sender IIRC...
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Old 09-16-2010, 12:13 PM
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Join Date: Nov 2004
Location: Nova Scotia, Canada.
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I would not drive this car before a good investigation. Suspicions are a oil pump sprocket with teeth problems or the oil pump driving chain tensioner. Or some combination. At least inspection is not hard to do with the small portion of the oil pan being removable. Also may be in the oil pump itself is something has broken up perhaps. That is not too likely though. Of course it may be something simpler Just stop using the car before finding out.. The oil pressure upper limit valve on the oil pump might just be randomly hanging up.. This too is inspectable.

As the last poster said basically you cannot ignore your symptom. You may also already have been lucky all oil pressure was not lost. Of course you are sure the oil level in the engine is showing on the dipstick?

All these suggestions are based on having the mechanical oil gauge system. If you have the electric one the problem is probably in the pressure reading circuit. Like a shaky pressure sensor perhaps. It is old enough to easily develop internal contact problems.Nothing lasts forever.
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Old 09-16-2010, 12:36 PM
rrgrassi's Avatar
mmmmmm Diesel...
Join Date: Jun 2006
Location: Royse City Tx
Posts: 4,872
Replace the o rings on the shaft that is aprt of the oil filter cap. That would be the quickest and easiest 1st step.

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