your 1984 190D 2.2 had no oil pressure for the first 10 seconds after cold start-up?

This car uses NO oil between changes and runs flawlessly other than the oil pressure item. At idle it has a good 1.5 bar pressure and pegs out at the slightest touch of the accelerator.

Just curious. Your expert advice is welcomed.

Kevin

Have you messed with the instrument cluster latetly? I.e. pulled it out. Sounds like you might have some air in the oil pressure sender line.

__________________
'84 300CD Turbo 132k (Anthracite Grey) - WVO - My daily driver - Recently named coo-coo-coupe by my daughter.
'84 300D Turbo 240k (Anthracite Grey) - Garage Queen
'83 300D Turbo 220k (Orient Red) - WVO - Wifes daily driver

I'm not a certified mechanic, but I did stay at a HolidayInn Express last night.

I have had the cluster out to fix the speedometer. If I do have air in the line then how would I purge the line? YOur help is appreciated.

Kevin

OIl slick,

Not air in oil gage line. Even if it were, that would not prevent the gage from registering pressure immediately. Don't gages that read air pressure react immediately?

I would suspect the o-rings in the oil filter or some other leak that is draining the oil filter and it takes a few seconds to refill the filter.

P E H

I didn't change it myself so I am quite sure that there were no o-rings replaced on the filter cover stem. Would those o-rings cause this kind of problem?

Kevin

I second PEH. Possibly even no o rings there at all as opposed to just old and hard.

__________________
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

My guess would be an incorrect oil filter installed or an oil filter grommet dislodged.

__________________
Palangi

2004 C240 Wagon 203.261 Baby Benz
2008 ML320 CDI Highway Cruiser
2006 Toyota Prius, Saving the Planet @ 48 mpg
2000 F-150, Destroying the Planet @ 20 mpg



TRUMP .......... WHITEHOUSE
HILLARY .........JAILHOUSE
BERNIE .......... NUTHOUSE
0BAMA .......... OUTHOUSE

Replace the o-rings and make sure that you clean out the pinhole at the top of the oil filter stem as well as clean out the stem

JCD

Oilslick,

You can R&R the o-rings on the oil filter stem with out spilling any oil. Just remove the 2 nuts on top of the filter and pull the cover up. You might have to slip your fingers under the cover to hold the oil filter in place. The stem is attached to the cover and the 2 o-rings are near the end of the stem.

P E H

Is there any kind of diagram that shows how the O rings are supposed to fit. There are 2 O rings? I am not having any problems, but the first time I changed the oil in my two diesels they appeared to be different from whoever changed them last.

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Alan Hamm
'87 300SDL 277K Miles
'89 560 SL 68K Miles

Well I could be wrong here. I'm not an engineer but I have a pretty good mechanical mind. Oil is a fluid quite a bit less compressible than air. So if you had air in your oil line. It would have to compress before the gage designed to read the oil pressure could register properly. Alot like how air in a brake line makes the brakes soft until the air is compressed enough.

As for gages that read air pressure , yeah they react immediately as they are designed to react to the pressure/vacuum level of air.

As for why his gage is lagging. In retrospect, the oil filter does seem to be a more logical explaination.

__________________
'84 300CD Turbo 132k (Anthracite Grey) - WVO - My daily driver - Recently named coo-coo-coupe by my daughter.
'84 300D Turbo 240k (Anthracite Grey) - Garage Queen
'83 300D Turbo 220k (Orient Red) - WVO - Wifes daily driver

I'm not a certified mechanic, but I did stay at a HolidayInn Express last night.

The resistance that guages have to pressure is so small, that it's very unlikely that even the most precision guage would show any difference if a little air was in the line. The reason air affects brake lines is because the pressures are so high.

Trust that you are well. Long time, no hear from, but then, I haven't been checking lately. If you recall, I came up there to buy seats last year. Is that the blue 240 that you are talking about? Have you found the problem yet?

I bought a sweet '84 300D sedan a few months back, so I'm still dieseling.

Andy Ross

when I lifted the top off of the oil filter housing I noticed that there was NO OIL in the housing. I did this first thing this morning so the engine had not been run since 7PM the evening before. Shouldn't there be oil in there or at least some?

Anyway, the o-rings are beginning to get brittle but they still had some "flex" to them. I have no clue on this. All of the other MB diesels that I have do not have this problem. Your help is greatly appreciated.

Kevin

As JCD mentioned, one other easy thing to check is to make sure that the pinholes, and very small passage from the bottom to near top of the oil filter stem are clear and clean. Blow into the small passage from the bottom of the stem to make sure that the passage is not blocked.

JCD

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'95 E300 Diesel, 264,000 Miles. [Sold it]