Larry , compression is down - around 18 bar all round and starting has become more slightly more difficult. It did not achieve full 24 bar when newly overhauled and I can only ascribe this to not optimal machining. honing by engineering shop - perhaps this is the cause of the malay?? Oil pressure is 2 bar at idle hot and it pegs at 3 immediately. Was thinking - what actually lubricates the bores? is it splash/leaks from the small end? What is also unusual is that when I overhauled the engine all the rings where carboned up onto the piston on all 5 pistons. I suspect the same might be happening again. I was not however my driveing that contributed to this as I had just bought the car when I overahuauled it. My other Om617's show now sighn of similar problems - I also overhauled my 300GD ( a crack in head that had been repaired by previous owner was starting to leak ) and thats going well. Oil consumption is still low ( arround 0.2 l/ 1000 km ) PEter
2008/10/27 LarryT <[EMAIL PROTECTED]> > is the oil consumption from leaks or is it being burned? > > If burning, the time it is burning will help understand what might be > wrong. If after idling for a few minutes you accelerate and leave a smoke > trail bad valve guides are indicated. If it has white oil smoke > whiledriving at a steady speed, rings are likely the problem - or something > related to the pistons. > > A single oil sample is not as informative as several - preferably at > intervals of 1500 miles or more. > > As Curt pointed out, results are best evaluated over time. The history of > the engine is helpful info also - if used for short trips where it was not > warmed enough to burn off carbon deposits a misleading indication can ccur > -- > > Sincerely, > Larry T (74 911, 91 300D 2.5T) > www.youroil.net Oil Analysis Kits & > Porsche Posters/Weber parts > ----- Original Message ----- From: "Peter Merle" <[EMAIL PROTECTED]> > To: "Mercedes Discussion List" <mercedes@okiebenz.com> > Sent: Sunday, October 26, 2008 4:04 AM > Subject: [MBZ] Oil analysis problem > > > Sent oil samples from my 5 300D 's to the lab ( 3 x W123's , 1x 300GD ( >> OM617 ) and 1xW124 ) and got satisfatcory results from 3 off them . The >> one >> W123 ( the only one running Mobil 1 ) had high levels of Copper and Iron ( >> 29 and 71 ppm ) after 2000 km. Sodium, Siicon, Al , Cr , particulates, >> soot >> are all low . Lab suggested the oil pump is worn and I should test oil >> pressure . Well the oil pump had done only 60000 km and oil pressures are >> good. The engine is loosing compression and oil consumption has increaseed >> since engine rebuild a few years ago so something is not right. Any >> ideas >> anyone? >> >> Am going to change oil to delo 400 and then see what the results are. >> >> Regarding the other car with poor results - I had just bought it - has >> been >> running on WVO for 30000 km - well its oil had high levels of iron ( 93 >> ppm >> ) as well as particlates - diagonis by lab was that oil filter was being >> bypassed ie filter blocked. is this a problem with WVO ? Does the stuff >> get >> into the engine oil and block the filter? >> >> Peter >> _______________________________________ >> 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
