Join Date: Sep 2005
Location: Kincardine, ON, Canada
Can you predict rear drive failure?
I often wondered if it was possible and my experience might provide some insight.
I've been having the oil analyzed every time I've changed the rear drive lube. (Engineeres have to have data!!)
Typically I change the rear drive lube at every engine oil change. This has varied from 3500 Km to 8500 Km.
The analysis checks for wear products such as: iron, chromium, nickel,titanium,copper,aluminum, tin, lead and lists them as ppm in the volume of oil in the drive.
I "normalize" the results by dividing these ppm values by the number of Km driven between changes.
This graph shows the results since 2008. The amount of iron has been steadily increasing which indicates increasing wear on the ring and pinion.
Chromium has also been increasing and chromium is one of the metals used in the ball bearings.
At this point, my LT has 54000 km and a leak has started to develop at the rear drive and a slight looseness can be felt in the rear wheel.
All of this would seem to indicate that failure is close.
Thoughts and comments????
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