I think there is also one in the filter housing so it can bypass if the filter plugs.
Bob DuPuy On 6/30/06, J.B. Hebert <[EMAIL PROTECTED]> wrote:
According to 18-5031HA, the oil pressure relief valve is part of the oil pump, so if I end up dropping the pan I will check it. I do not want to have to drop the pan, though... so I'm going to first hook up a mechanical gauge to be absolutely sure it isn't a gauge issue. Then I will likely remove the oil to water head exchanger on the passenger side of the sump, which should give me a decent view of the oil pump and surrounding area. Thanks, J.B. Hebert At 08:33 AM 6/29/2006, you wrote: >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 > > > >_______________________________________ >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: 268.9.6/378 - Release Date: 6/28/2006 -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.1.394 / Virus Database: 268.9.7/379 - Release Date: 6/29/2006 _______________________________________ 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
