Re: [MBZ] Belt tensioning lever replacement - 602.962
OK Don wrote: I was using the torque wrench, but don't think I reached much more than 40-50 Lb/Ft. before it started feeling scary. I remember Dave's ordeal -- Guess I was hoping that the '90 model would have been improved already. Have there been any reports of successfully replacing the bearings in the lever arm?? You DON'T replace the bearings, you replace the complete arm/bearing assembly. I've done it half a dozen times without any problem. If the threads ARE damaged, you MAY not be able to use the damaged cover or if you use it, it may fail unexpectedly. I don't know what to tell you other than do the best you can and keep an eye on it. Marshall -- Marshall Booth (who doesn't respond to unsigned questions) der Dieseling Doktor [EMAIL PROTECTED] '87 300TD 182Kmi, '84 190D 2.2 229Kmi, '85 190D 2.0 161Kmi, '87 190D 2.5 turbo 237kmi
Re: [MBZ] Belt tensioning lever replacement - 602.962
You DON'T replace the bearings, you replace the complete arm/bearing assembly. I've done it half a dozen times without any problem. If the threads ARE damaged, you MAY not be able to use the damaged cover or if you use it, it may fail unexpectedly. I did replace the whole assembly, but kept the old one thinking about replacing the bearings for future use. I don't know what to tell you other than do the best you can and keep an eye on it. Exactly what I'll do. Maybe I should have used epoxy instead of Locktite - LOL. -- OK Don, KD5NRO Norman, OK '90 300D, '87 300SDL, '81 240D, '78 450SLC The FSM created the Diesel Benz http://www.venganza.org/
Re: [MBZ] Belt tensioning lever replacement - 602.962
Have there been any reports of successfully replacing the bearings in the lever arm?? Our SDL ate its new tensioner arm's bearings in what I consider to be short order (two years?), so I replaced the bearing in it. The original is an odd size, a double-race job that is quite deep. I couldn't easily source it, so I used two single-race bearings with a spacer in between. So far, so good. -- Jim
Re: [MBZ] Belt tensioning lever replacement - 602.962
OK Don wrote: I replaced the badly worn belt tensioner lever (and pulley) on the '90 300D 2.5. last Wed. (beautiful day - 65F, sunny). The bolt that holds the assembly to front of the timing case is supposed to be torqued to 100NM, about 74Lb/Ft. I don't know how far I got, but as I was tightening it, it reached a point where it felt like the pressure was constant, and the bolt was still turning. It was very similar to the felling you get from a bolt that is about to strip out the treads. Since this is screwing into the aluminum case, I stopped. The bolt does have a copious quantitiy of blue locktite (after cleaning the threads), so I'm going to watch it and see if it stays in place. I vagely remember a similar experience when I replaced the same part on the SDL. Anyone else have this experience? Were the bearings just getting pressed into place, or are the threads really in danger of stripping? The answer is YES! In early OM60x engines MANY timing covers were stripped when tightened down. I can't tell you if it was carelessness (not using a torque wrench) or that the cover (its been revised at least once - maybe more) really was inadequate. Dave M. has had the cover fail (really messy) and has pictures to prove it. Replacement of the timing cover is a BIG job (8-10 hours flat rate time as I recall). I have seen the threads strip. Later models should not be as vulnerable (I have NOT heard of NEARLY as many tensioner arm failures of any sort in '90s cars as with the assemblies in mid '80s cars) Marshall -- Marshall Booth (who doesn't respond to unsigned questions) der Dieseling Doktor [EMAIL PROTECTED] '87 300TD 182Kmi, '84 190D 2.2 229Kmi, '85 190D 2.0 161Kmi, '87 190D 2.5 turbo 237kmi
