400E Low/No oil pressure? - PeachParts Mercedes-Benz Forum

emerydc8 · #1 08-03-2010, 05:01 AM

They do charge a lot, but being an avionics guy, you have to admit that they have an aircraft-like quality to them, especially that giant bladed canon plug. BTW, I used to fly into VHP in the nineties and could have really used a good avionics guy at the time. You know how bad the douglasaurases were.

deanyel · #2 08-03-2010, 11:45 AM

The oil pressure sender is on a different harness - the lower engine harness, which is even easier to rebuild than the upper. If it's original, and not the problem, it probably will be after you mess around with the OP sender.

anziani · #3 08-03-2010, 12:07 PM

I highly recommend "Auto-RX" oil treatment. My 300CE was gunked up so bad that my indie was stunned. We had to dig the oil filter out. It looked like it had never been changed! Auto*RX recommends 2 treatments for this type of engine. You can tell how it is working as the filter is changed twice for one oil change. It amazed us to see the flakes of gunk in the filter. It is NOT a solvent cleaner. My engine interior is now like new. I also noticed an increase in power although that might be wishful thinking.
Anziani
'93 300DE190K
'95 E420 120K

ashedd · #4 08-03-2010, 08:54 PM

I will get some of that auto-rx stuff. Got my new transmission cooler line today. Got to drive around the neighborhood..

it's no diesel. I think I put about 10 miles on it. Having a little trouble burping the coolant since I had to remove the lower radiator hose. No engine noise so I am confidant I have oil pressure

.

If I ground the oil pressure sender wire does the gauge peg?

What is the ideal engine temp? Stayed about 85 and got up to 100 once. Seems to bounce around from 80 to 90.

emerydc8 · #5 08-04-2010, 01:49 AM

80-90 degrees is where you want to be. If your freon is low, it may cause the low-speed fans not to operate and you could see the temp creep up to the point that the high-speed fans would kick in (around 105).