No Oil Pressure - PeachParts Mercedes-Benz Forum

crbnfbr · #1 12-08-2003, 03:27 PM

After sitting for over a month I finally got may car to start. However, when I start the engine the oil pressure gauge barely raises off the bottom.
The guage reads the same when I turn the key 1 click before starting.

Does this mean my pressure sending unit is bad, or is it something more serious?

Thanks

mhingram · #2 12-08-2003, 03:56 PM

look at the cam oilers if oil is flowing well then check your oil pressure sensor. it maybe out. When they go they are very wierd.
m

crbnfbr · #3 12-08-2003, 05:02 PM

Well, I took off the oil cap while the engine was running and I can't see any oil flowing around the cam.
I figure it's probably the oil pump.
So, I was wondering how hard is it to change on an 86 190 16v?

Or, could there be some other reason why no oil is circulating?

Thanks

suginami · #4 12-08-2003, 05:03 PM

At first blush, I'd point my finger at the oil pressure sending unit.

mhingram · #5 12-08-2003, 05:52 PM

oil pump is a good place to start. Never done on on a 190 but my 4.5 was relatively easy. I know this may seem a dumb statement but the oil did not leak out over the long period of rest. check your level you never know. m

crbnfbr · #6 12-08-2003, 07:04 PM

Yeah, I checked the oil level and it's right between the lines.

I called the dealership to find out how much a new oil pump would cost, and the guy on the phone said they didn't have any oil pumps for a 190E 16v just a "Oil Pump Rotor Set".

I was wondering if that "Oil Pump Rotor Set" should fix the oil circulation problems, or will I have to find a whole new oil pump assembly?
Also, is there a way to test the oil pump with out tearing the engine all apart?

Thanks for all your help!

william rogers · #7 12-08-2003, 09:46 PM

Fastlane should have them at much better price than dealer.I changed the oil pump chain and guides on my 500SE taking the pump off in the process,make sure that you fill the oil pump full of oil before instaling or you won't have oil pressure on start up at least on the V8.........

William Rogers...........

william rogers · #8 12-08-2003, 10:15 PM

I just looked in FastLane they show an 4 oil pump rotor repair kits for the 16 valve ,must be a whole different set up than the V8 pumps.They are 73 dollars each for two of them and 58each for the other two so you need your engine number to order the right one...............
William Rogers.........

Duke2.6 · #9 12-08-2003, 11:58 PM

The oil pressure gage sending unit is a whole lot cheaper and easier to replace and a lot less reliable than the pump itself.

Your choice!

Duke

haasman · #10 12-09-2003, 01:43 AM

AND .... what if after you replaced the pump et al ..... you still didn't have any oil pressure registering on the gauge .....

-Listen to Duke-

Repair what is broken, not what you think it might be. This has always saved me time and money.

Haasman

suginami · #11 12-09-2003, 12:43 PM

Quote:

Originally posted by haasman
AND .... what if after you replaced the pump et al ..... you still didn't have any oil pressure registering on the gauge .....

-Listen to Duke-

No,

- Listen to Suginami-

I said it first. I get credit if it's the sending unit.

mhingram · #12 12-09-2003, 01:49 PM

He is getting no oil through the cam oilers correct, I would be very wary just replacing the senor if no oil is getting to the cams.
m

crbnfbr · #13 12-09-2003, 09:27 PM

Yeah, no oil is getting to the cams.
Could I pul the oil filter out of the housing and crank the engine over (without the coil connected) to see if oil is getting there? Or would it be bad to crank the engine with no oil getting to the cams?

Also, is it pretty easy to pull the oil pan off with engine in the car?

Right now it seems like I have no oil circulation at all.

kerry · #14 12-09-2003, 09:46 PM

Does that engine have an oil pressure relief valve of some kind that might be stuck open? You could remove the oil pressure sending unit and turn it over to see if oil squirts out the hole.

I'd at least get a diagram of the oil system on that engine and look at it to see all the possible failure points before dropping the pan to replace the pump. It seems very odd that a pump would fail from just sitting. It seems more likely to me that the problem lies elsewhere.

mhingram · #15 12-09-2003, 10:38 PM

cr, does the car actually start when you check this or just turning over because it will take a few secs to get oil throughout the engine. If you want to test for oil pressure find an oil outlet above the sump level and disconnect it crank the engine see what happens. The other option is to pull the valve cover and crank the engine make sure it is not just the cam oiler near the cap that is not working. It is messy but definitive.
m