adjusting w115 differential pinion preload

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adjusting w115 differential pinion preload

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Mercedes Forums >> Mercedes Benz Models >> Diesel Discussions >> adjusting w115 differential pinion preload

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adjusting w115 differential pinion preload - 4/9/2007 2:28:20 AM

otm646

Posts: 63
Joined: 11/21/2006
Status: offline

i have a loud whine produced by the differential when i let off the throttle. it ceases during down shifts. after much reading i have sourced it to a improper pinion preload. alignment is fine under power but as soon as the throttle is lifted the whine begins.

"The symptoms are : 1) The whine usually starts after the differential oil has warmed up
2) The pitch changes or disappears with throttle variation. Pinion pre-load is lost gradually over the life of the differential as the bearings and or race wears with use. This wear can cause enough pre-load to be lost that the pinion will actually move when torque is applied or removed to the pinion via the driveshaft under engine acceleration or deceleration."

http://bernardembden.com/xjs/diff/index.htm

he also describes a practical adjustment method

has anyone one had hands on experience adjusting the preload? any tips or tricks would be valued.