Question: What oil have you used in the diff's that failed? Ring and Pinion gears are held in strict position by properly shimmed bearings. As long as that strict position is maintained, they will run silently. As soon as shim or bearing wear happens the relationship of Ring to Pinion shifts, and because it is a complex gear cut relationship,, they start to make noise and failure is in their future.. because once a bearing fails even a little, it is on par with being "only a little pregnant.." It's is going to get more out of tolerance.. I posit the base cause of failure lies with bearings.. likely pinion bearings, since they are smaller and more highly loaded.. further, properly lubricated bearings seldom fail and last a long time, thus, my speculation is, the culprit in this serial failure could be lubrication used was not up to the task it was given... Just my thoughts on the subject.. yours may be different..
On Sat, Jun 10, 2023 at 9:52 PM Karl Wittnebel via Mercedes < mercedes@okiebenz.com> wrote: > The original differentials in the 85 wagon and the 88 560sel both started > to make progressively louder whirring sounds, so they were on their way > out. I replaced both. Wagon had about 211k on the clock and the 560 99k. > Not nearly the hundreds of thousands others seem to get. > > Replacememt on 560 locked up within a few hundred miles with new oil. > Diff#2 was loud from the start and had a lot of klunk on downshifts and > into reverse. Diff 3 is in the car now and is much quieter, so maybe it > will go for awhile. > > Wagon is a longer story. > > If I replace the valve cover gaskets on the 560 it should be leak free for > awhile. > > K > > On Thu, Jun 8, 2023, 9:09 AM Randy Bennell via Mercedes < > mercedes@okiebenz.com> wrote: > > > On 07/06/2023 1:46 PM, Karl Wittnebel via Mercedes wrote: > > > Has anyone else run into a serial differential swapping issue . . . but > > then the replacement on the wagon seems to have blown a seal > > > and is trying to seize up while the 560 locked up tight on the 405 > > > yesterday > > > > Is there enough play in the bearings on the wagon to have caused the > > seal to leak or did the seal just get old and the rubber get harder? > > > > Was there evidence that the seals were leaking on the 560 as well? > > > > Running out of oil is no doubt going to cause major differential failure > > no matter what brand of vehicle. > > > > Randy > > > > > > _______________________________________ > > http://www.okiebenz.com > > > > To search list archives http://www.okiebenz.com/archive/ > > > > To Unsubscribe or change delivery options go to: > > http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > > > > > _______________________________________ > http://www.okiebenz.com > > To search list archives http://www.okiebenz.com/archive/ > > To Unsubscribe or change delivery options go to: > http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > > _______________________________________ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
