In working on a 606 yesterday and removing that bolt/valve which is the same as 602-603 I can tell you it is not serviceable on those cars as in you can't remove the spring. Those would just have to be replaced.
Sent from my iPhone > On Mar 27, 2017, at 8:19 AM, MG via Mercedes <mercedes@okiebenz.com> wrote: > > That is my thought. I believe the spring may have been weak enough to lower > the pressure in the pump to the point where the fuel wasn't filling the > injector pistons all the way especially the last ones in line. It may also > have advanced the timing some. In the injection pump on the GM 6.2 and 6.5 > when the ignition is turned to start a wire that goes to the injection pump > pulls the relief valve open which the manual says, if I remember correctly, > drops the pressure in the injection pump to 0, retarding the injection timing > by I think 4 deg. The normal pressure in there is about 10-12lbs. My thought > is the same thing is happening here even though the pumps are different the > principle is probably the same. > > In any case the more even idle and the quieter engine under power as well as > the better response seem to point to that conclusion. Though I really need to > do that 2mm chain stretch test to see what my chain stretch actually is. The > quick and dirty method says around 4-5deg but that's not very precise. > > Anyway even the manual recommends stretching the spring to 27mm if the > pressure is low. No I didn't check the pressure but given the age of the car > I have little doubt that it wasn't where it once was when new. > > My next little project is to put an electric pressure gauge on the line > between the final filter and the pump to keep track of the pressure while > driving. This should tell me when my filter is getting to the point of > needing a change. > > Manfred > > Dan Penoff via Mercedes wrote: >> Manfred, >> Are you suggesting that the changes in your engine operation are due to your >> stretching the relief valve spring? >> And Curley - have you tinkered with the same spring on the OM603 engines and >> seen a difference in performance or operation? >> -D >> >>> On Mar 26, 2017, at 10:22 AM, MG via Mercedes <mercedes@okiebenz.com> wrote: >>> >>> My 300TD is still doing a nice smooth idle and does seem to have more power >>> and oddly enough the engine is quieter both at idle and going down the >>> road. I have the impression that it accelerates as well now as it did >>> before I put in the lower ratio differential from the 84 TD. After I had >>> put the differential in I noticed a definite slower acceleration that is >>> now gone. The mileage on the first tank, and I always fill till I see the >>> actual liquid fuel at the top of the fill pipe, with the 5% correction for >>> the difference in the gear ratios has gone up to 26.2 from 24.6. That was >>> mostly a trip down to Orlando including a lot of stop and go both on the >>> way down (441) and in town there as well as using the AC all the way back. >>> I expect that it may go up a bit with my normal driving around the G'ville >>> area. >>> >>> Dan Penoff via Mercedes wrote: >>> >>>> Did the spring stretch on the 300D pressure valve. The spring is >>>> definitely the original based on a visual inspection, and was barely 2 cm >>>> long. I stretched it to 27 mm and installed it. A definite difference in >>>> idle smoothness - he engine doesn’t sway nearly as much as it had >>>> previously, so this is good. >>>> Might just do the steering stabilizer on the 350SDL in the driveway, since >>>> it won’t take but a couple of minutes. I’m thinking I’ll save the SL500 >>>> for tomorrow. Gotta pace myself…. >>>> -D >>> _______________________________________ >>> http://www.okiebenz.com >>> >>> To search list archives http://www.okiebenz.com/archive/ >>> >>> To Unsubscribe or change delivery options go to: >>> http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com >>> >> _______________________________________ >> http://www.okiebenz.com >> To search list archives http://www.okiebenz.com/archive/ >> To Unsubscribe or change delivery options go to: >> http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > > _______________________________________ > http://www.okiebenz.com > > To search list archives http://www.okiebenz.com/archive/ > > To Unsubscribe or change delivery options go to: > http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > _______________________________________ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
