Goodmornin. I woke up to real shaky oil pressure on my 84 300tdt. What could be cause of this and should I not be driving it like this?

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'84 MB 300TDT 280,000. My first MB (Owned since 190,000)
'83 MB 300D w/ 165,000


John3:30 "He must become greater, I must become less"

When you say shaky...

Does the gauge fluctuate significantly (bounce etc)? Does it start with low pressure? Does the low pressure stay that way?

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1985 MB 380SL
2003 Jaguar X-Type

I'd guess he's refering to hot idle pressure.

Min idle should be 0.5 bars, and by 1500 rpm it should peg the gauge @ 3bars. Use a diesel rated 15W40 motor oil like Delo to minimize the effect. Too low of an idle speed with make things seem worse than normal.


Michael

There was a TSB on on shaky 123 oil pressure gauges and a fix. It involves placing an object in the oil gauge line. someone on here did it and I seem to recall that it worked.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

Shaky oil pressure is often due to bad rod bearings or leaking pressure regulator.

I has forgotten about that. My almost new '78 300D's oil pressure gauge developed a bit of palsy and the fix was a small sliver of plastic (an MB repair kit, came in a little plastic bag) which, after unscrewing the oil line to the gauge, was inserted into the gauge input, pointed end in, then reinstalling the line. This damped out the pulses from the pump at hot idle.

The only unexpected effect was that on cold startup, the pressure was perhaps one second slow to indicate.

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Roger E.

Updated the thread not too long ago,

http://www.benzworld.org/forums/w123-e-ce-d-cd-td/1531707-1981-300-td-chattering-oil-pressure-2.html

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http://farm8.staticflickr.com/7271/7...144c3fc1dc.jpg

It could be as simple as the O-ring on the shaft that goes down through the oil filter. If that gets hard, brittle and breaks off, it will cause the needle to fluctuate. It is simple to replace so I would recommend starting there.

Richard

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85 300D 75K Anthracite Grey 0-60 in 13 seconds **For Sale**
84 300D 333K Black (The Velveteen Rabbit) 0-60 in 14 seconds
00 Toyota Sienna 208K (Sold)
15 Subaru Outback 43K
11 Subaru Outback 67K
98 Ford Taurus 100K (Gertie - Was Grandma's - drove it to church and shopping - really) Daughter's car now.
30 Model A Ford 2 Door Sedan (Sold) 0-60 in . . . Never reached 60

x2 on the o-rings. I had a vibrating oil gauge on my wagon. I picked up the MB part and then read about the o-rings. I decided just to try the latter as the quick fix. One o-ring was pretty sloppy. Replaced them both with the correct sized ones and so far the vibration is gone.