I like to think it is a rodbearing myself. It does not overheat. The knock is louder near # 2 at the head and as I said loudest at the lower front. My good friend and Indy has some reservations about the balancer. What happens when it lets go?
On 3/14/07, Loren Faeth <[EMAIL PROTECTED]> wrote:
Sounds like a spun bearing on #1 rod. Hope for your sake I am wrong. Does it overheat? When that happened on my OM621, 4 cyl, it also overheated. It is a harsh metal on metal knock. #1 always fails first unless there is damage caused by an injector or valve etc. At 06:00 PM 3/14/2007, you wrote: >One other observation: the frequency of the knock is as close as I can >tell 1/2 the rpm i.e. the result of the powersroke of one of the >cylinders. > >On 3/14/07, Hans Neureiter <[EMAIL PROTECTED]> wrote: > > Today I went to do some more investigating: > > Excessive blow-by is not evident. The turbo is slightly oily, but the > > shaft is moving a little in radial direction. > > The motor started right up. A huge, scary clunk at first that turned > > into a steady, loud hammering. Oil pressure first pegged and went to > > 2.5 bar at a steady 800 RPM idle. > > When operating temp reached 85 C (after ~ 5 min.) pressure dropped to > > slightly above 1 with a few short excursions to below 1 bar. > > Loosening the injector lines resulted in a noticeable reduction of > > knock intensity but was equal for each cylinder. > > Using a stethoscope, the highest intensity of the knock is apparent > > near the front crank seal and at the Vac.pump housing. > > Lots of blue smoke at first that never really cleared. > > Motor ran for at least 20 minutes until turned off. > > Questions: > > Can injectors/prechambers be ruled out as major cause? > > Does oil pressure behavior indicate crank bearing failure? > > Does most noise coming from front crank seal indicate balancer failure? > > Do I have a conglomeration of failing parts (Turbo seal = blue smoke, etc.) > > My conclusion so far: 90% bottom end problem. But what? > > > > On 3/14/07, Trampas <[EMAIL PROTECTED]> wrote: > > > I have two W126s with OM617s that my wife is after me to get rid of. I am > > > located in Raleigh NC. Just in case you need an engine. > > > > > > One of the cars is a 1985 300SD with around 300k miles, runs and > drives but > > > needs front end rebuilt (tie rods etc). Also the body is a bit rough > as it > > > does have 300k miles. > > > > > > The other one is a 1984 500SEL which I put a OM617 in, the engine runs > > > great, but the body is rusted. The engine came from a 1982 300D that > was in > > > worse shape. > > > > > > I have been meaning to get some pictures of the two beasts, will let you > > > guys know when I get some up. > > > > > > Trampas > > > > > > -----Original Message----- > > > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] > > > On Behalf Of Peter Frederick > > > Sent: Tuesday, March 13, 2007 9:08 PM > > > To: Mercedes Discussion List > > > Subject: Re: [MBZ] 126 pre chambers > > > > > > Worst case it ingested water and it's toast (bent rods), but in that > > > case the response would have been pretty fast and probably wouldn't > > > have started. Lots of blue smoke out the back before it died? > > > > > > Don't know -- time to pull the injectors and do a compression test. > > > > > > 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 > > > > > > > > > -- > > Hans Neureiter, Houston, TX > > '82 300SD, '95 E300D > > > > >-- >Hans Neureiter, Houston, TX >'82 300SD, '95 E300D > >_______________________________________ >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 Loren Faeth _______________________________________ 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
-- Hans Neureiter, Houston, TX '82 300SD, '95 E300D
