This engine has been driven has been using WVO for arround 12000 km . It is using a 1micro filter. He has another W123 300D also on WVo and its been going for arround 32000 km now without issues.
What gets damaged in the pump? Surely it would be terminal and not intermittant. Thanks Peter 2008/10/8 Mathieu J. Cama <[EMAIL PROTECTED]> > Peter, > > Intermittent missing can be a sign of weak compression on a particular > cylinder. Cover your bases and do a compression test or, better yet, a leak > down test if you have the equipment. Prior to checking compression, make > sure valve lash has been set properly for all valves. While checking valve > lash, also carefully inspect each cam lobe for wear/scoring. A worn cam lobe > can also cause this symptom. > > FYI, per the factory 1980 TDM, the specs are as follows: > > Wear limit for compression is 15 bar (220.50 psi), below that the motor > will likely not run. (Installation tolerance is 22-24 bar (323-352 psi)) > Maximum loss for leakdown test is: 25%. > Maximum compression differential between cylinders at operating temperature > is 3 bar (~45 psi). > > If compression/ leak down checks out OK, make sure the cam timing is on the > mark. Is there any sort of smoke or other symptom(s) that would be > indicative of the IP being off-time? > > If these check out fine, I would delve into the fuel side of the motor. > Diesels are simple, with correct timing, good compression, and fuel, it has > to ignite. Not many variables, here. > > If this car has been running WVO, the injection pump may have suffered > damage and in turn cause this symptom. I have seen that before. > Insufficiently heated or poorly filtered WVO will trash an IP in short > order. > > Mathieu > www.oldworldauto.com > > > > > > > > On Oct 7, 2008, at 4:29 PM, Peter Merle wrote: > > A friend of mine brought his W123 300D ( Non turbo ) to me to try and >> sort >> out his intermittent idle problem. - Usually the engine purrs nicely but >> then every now and then the idle speed drops and engine runs roughly. When >> this occurs I isolated the problem to #1 cyl - ( by disconnecting each >> fuel >> line in turn #1 did not have a affect ) . When engine runs #1 is fine as >> are >> all other cylinders. I initially checked spray pattern on the tester - Ok >> . >> I replaced the injector with a known good one and the problem was still >> there. I then replaced dellivery valve an dth eproblem is still present. I >> am now a bit stumped - coul dit be a stuck injection pump element? what >> about an engine valve not closing? Any ideas are welcome! >> >> 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
