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
