It was mentioned earlier, but be sure to check the oil pressure regulator, sometimes also called overpressure bypass. The springs can break or the valve become jamed in its bore.
Bob DuPuy Parrish, FL On 6/29/06, LarryT <[EMAIL PROTECTED]> wrote:
Sorry to hear it wasn;t one of the easy things (relatively) to fix that was suggested - hopefully the pump intake is only blocked and the main bearings are not damaged. Good luck - Larry T (67 MGB, 74 911, 78 240D, 91 300D) www.youroil.net for Oil Analysis and Weber Parts Test Results http://members.rennlist.com/oil Weber Carb Info http://members.rennlist.com/webercarbs Porsche Road Test http://members.rennlist.com/roadtest/ . ----- Original Message ----- From: "J.B. Hebert" <[EMAIL PROTECTED]> To: "Mercedes Discussion List" <mercedes@okiebenz.com> Cc: <[EMAIL PROTECTED]> Sent: Wednesday, June 28, 2006 9:54 PM Subject: Re: [MBZ] Sudden loss of oil pressure >I tested the gauge and sender tonight. The gauge goes right to 3 > when disconnected, and back to 0 when grounded, so it is fine. I > removed the sender and made a fixture that allowed me to pressure > test it. At 0 bar, it read about 7.3 ohms. At 15 PSI (around 1 bar) > I got around 62 ohms. At 30 PSI, 111 ohms. At 45 PSI, I got 172 > ohms. So the sender is a little low based on the manual (or maybe my > gauge is off), but the sender is certainly responsive. > > So it looks like I'll be pulling the pan next... and I was depressed > to see that it's a once piece pan, unlike my old OM617 with the 2 > piece unit. That would have made it much easier. So I'll have to > track down a gasket at the very least. I am now hoping that it's > just a blocked pickup, but we'll see. > > Thanks, > > J.B. > > At 12:18 PM 6/27/2006, you wrote: > >>On my way into work today my low oil light came on. Oil pressure was >>fine, so I continued on another minute or 2 and the light went >>out. A few miles later I noticed that my oil pressure had started to >>fall. When it dipped below .5 bar, I shut off the motor and coasted >>to the side of the road. The low oil light had not come back on >>again. I popped the hood and checked for leaks or any indication of >>a problem. I found no leaks, and the oil level was between min and >>max on the dipstick. I restarted the car and the oil pressure went >>to about 1.2 bar, but would not go higher as RPMs increased. After >>10 seconds or so of running it started to drop again so I shut the >>motor off again. The vehicle has shown no signs of a failing oil >>pump or any other issues. It normally idles around 1.8 to 2 bar and >>pegs the needle quickly. There are no odd sounds, smells, or >>sights. Now, I changed the oil filter last night (Mann filter, just >>like always), which is the only thing I've done to the car >>recently. I have no idea if it's coincidence or not, but I plan on >>pulling the filter tonight to see if I can see anything wrong. Even >>if the filter was faulty and stopped oil flow, there is a filter >>bypass so I should not have seen the symptoms I'm seeing. It appears >>that the oil is not flowing back down to the sump quickly enough and >>the pump is sucking air. I'm having the vehicle towed home for >>further diagnosis, but welcome any suggestions. >> >>Thanks, >> >> >>J.B. Hebert >> >>---------------------------------------------- >>Current Vehicles: >> >>'76 Ford Bronco >>'78 Volvo 262C Bertone V8 >>'80 Alpina B7 Turbo Coupe >>'82 Mercedes 300CD (Deceased) >>'93 GMC Sierra 2500 >>'95 Mercedes E300D >> >> >>-- >>No virus found in this outgoing message. >>Checked by AVG Anti-Virus. >>Version: 7.1.394 / Virus Database: 268.9.5/376 - Release Date: 6/26/2006 >> >> >> >>_______________________________________ >>http://www.okiebenz.com >>For new parts see official list sponsor: http://www.buymbparts.com/ >>For used parts email [EMAIL PROTECTED] >> >>To Unsubscribe or change delivery options go to: >>http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com >> >> >> >> >> >>-- >>No virus found in this incoming message. >>Checked by AVG Anti-Virus. >>Version: 7.1.394 / Virus Database: 268.9.5/376 - Release Date: 6/26/2006 > > > -- > No virus found in this outgoing message. > Checked by AVG Anti-Virus. > Version: 7.1.394 / Virus Database: 268.9.5/377 - Release Date: 6/27/2006 > > > > _______________________________________ > http://www.okiebenz.com > For new parts see official list sponsor: http://www.buymbparts.com/ > For used parts email [EMAIL PROTECTED] > > To Unsubscribe or change delivery options go to: > http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com _______________________________________ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
