'70 250C Lost! cant find my oil pressure! - Mercedes-Benz Forum

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post #1 of 3 (permalink) Old 04-07-2007, 01:40 PM Thread Starter
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Date registered: May 2005
Vehicle: 1970 250C
Location: North Dakota
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'70 250C Lost! cant find my oil pressure!

Hey, hoping you all can help me out here. last summer i was driving my 250C when I lost oil pressure, I shut it down right away and towed it to my dads shop. My dad does mechanic work so he will be a big help, I was wondering where I should start, I havent torn into it yet but obviously I should probably start at the oil pump.

How would you guys go about tackling this problem? I got a haynes manual for it, but there is nothing better than personal experiance and if anyone on here has done anything like this in the past, I would appreciate some pointers.

btw, I had asked a question about this last fall, but never had time to get to working on it, but I need to get it going this spring, the fiance wants to ride off in it on the wedding day

Thanks, Josh

Edit, there were a couple posts on my original thread that I never saw, and autozen said that the fuel pump is driven off of the oil pump, the car was still running when I shut it down (obviously) so, if the oil pump is still working what else could it be? and if the oil pump did quit, killing the fuel pump, how long would it stay running? a few seconds? a minute? maybe i saw it right after it gave out... just some thoughts. thanks!

Last edited by joshdvirnak; 04-07-2007 at 01:57 PM.
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post #2 of 3 (permalink) Old 04-08-2007, 01:52 AM
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If the oil pressure gauge suddenly started reading zero I'd suspect the oil preassure sending unit was faulty. I'm not too familiar with your motor, but most cars have the sender right next to the oil filter. You should measure resistance between the 'lectric connector and a good ground. Also measure the voltage at the connector with the ignition switch in the RUN postion. Maybe someone else here could post what the measurments are supposed to be.
If the oil pressure slowly went down as the motor heated up to normal temperature your probably looking at replacing the main bearings (at the least). A complete rebuild may be needed.
A worn out oil pump is a possibility, but that is usually not the case.
--Reiteration; this is typical of most ordinary cars. I'm not too familiar with your particular motor. In fact, I don't know if the gauge is even electrically or mechanicaly operated. If it's a mechanical gauge, I would say a leaky connecting line is the prime suspect.

Chris from Whidbey Island
I've got a lovely bunch of coconuts.

Last edited by U14NLD; 04-08-2007 at 02:42 AM.
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post #3 of 3 (permalink) Old 04-08-2007, 05:17 AM Thread Starter
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Date registered: May 2005
Vehicle: 1970 250C
Location: North Dakota
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I believe that it is a mechanical guage, and while I have looked and havent found any leaks or drips, that doesnt mean that a line couldnt be plugged somewhere, right? Also, I am currently on the other side of the state right now, the car is still at my dads shop, so dont have eyes on it now, I am just trying to get a starting point and an idea of where to start.

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