Break in difference
Okay so here's a question which comes to mind. Most everyone says incl GM, Ford and Ram to run a new diesel at least 500-1,000 miles to break it in before towing. Now, go to a semi dealer and buy a...
Forum Discussion
Have to have an understanding of gear sets and how they work...
They 'marry' themselves to each other during breaking
Design science and manufacturing science has come a long ways and will continue to get better and better...but...they still have to marry themselves to each other
But...there are many factors here...
Like in a perfect world, gear faces do NOT touch each other, metal to metal...the spec'd lube is of high enough film strength and viscosity to keep a film of lube between them and not allow them to touch during all phases of their job...including dynamic loading & shock loads (expected)...in a perfect world
They do touch metal to metal at the extremes of whatever poop situation happens
And the pressures exerted on the lube film does exert the same force on the metal
Risk of not breaking in properly is gear whine...not an absolute that it will happen...just the possibility. Am old and experience enough times trying to help folks who did NOT break in their diff gear sets and their complaints of that whine... Nothing short of changing out the gear set solved it totally....addition of molyb powder knocked one guys down a bit, but it still had some whine to it (regular open diff...molyb is too low in friction to be used in any LS or clutch based diff)
They 'marry' themselves to each other during breaking
Design science and manufacturing science has come a long ways and will continue to get better and better...but...they still have to marry themselves to each other
But...there are many factors here...
Like in a perfect world, gear faces do NOT touch each other, metal to metal...the spec'd lube is of high enough film strength and viscosity to keep a film of lube between them and not allow them to touch during all phases of their job...including dynamic loading & shock loads (expected)...in a perfect world
They do touch metal to metal at the extremes of whatever poop situation happens
And the pressures exerted on the lube film does exert the same force on the metal
Risk of not breaking in properly is gear whine...not an absolute that it will happen...just the possibility. Am old and experience enough times trying to help folks who did NOT break in their diff gear sets and their complaints of that whine... Nothing short of changing out the gear set solved it totally....addition of molyb powder knocked one guys down a bit, but it still had some whine to it (regular open diff...molyb is too low in friction to be used in any LS or clutch based diff)
