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shaft end play

J

johndeeregreg

Member
if you don't intend to replace the bearings but your there and can measure and adjust end play do you change the end play or just leave it alone? working on 8430 4wd and the counter shaft in the transmission has 0.022 end play, spec is 0.001-0.004. ideally the bearings should be replaced and adjusted but i don't really want to go that deep into it.

i have always felt you shouldn't change the setting on old bearings thinking they are seated into each other and if you change endplay it will make them have to re seat themselves and cause them to go bad quicker. from what i can see of them they appear to be ok yet as in i don't see any pitting or flaking on the rollers or race but i cant see much of it being its still assembled.
 
I would adjust to spec. Spec is there for a reason, would be harder on bearings having to move two ways. IMHO
 
How hard of job is it to adjust ? If easy I'd be inclined to try and adjust it closer to within spec. Maybe tighten it up tight and see if it still turns free if that is possible ? if so maybe the bearings are still good ? and then loosen back to spec.
 
No go ahead and reset the end play to spec. Just got through doing it on a 300,000 mile transmission
cvphoto5164.jpg
 
I'd be curious why the end play is now so large and try to fix the cause while you're already in there (worn bearing on it's last leg, broken spacer, stripped shaft retainer). Otherwise you may need to tear it apart again soon after a lot more damage has occurred.
 
well i adjusted it back to spec, time will tell if that was the right move. it spins good and sounds fine while spinning so with any luck it should be good for another 10,000 hours.
 
I always reset the endplay. Slightly worn bearings are not bad bearings. Used bearings will hold their endplay setting longer than new bearings because they are already seated.
 
Being 45 years old and who knows how many hours the bearings are probably worn and the gears and thrust washers and shims are probably worn a bit 16 or 18 thousandths isn?t very much really in all that time
 
(quoted from post at 15:03:08 02/14/20) if you don't intend to replace the bearings but your there and can measure and adjust end play do you change the end play or just leave it alone? working on 8430 4wd and the counter shaft in the transmission has 0.022 end play, spec is 0.001-0.004. ideally the bearings should be replaced and adjusted but i don't really want to go that deep into it.

i have always felt you shouldn't change the setting on old bearings thinking they are seated into each other and if you change endplay it will make them have to re seat themselves and cause them to go bad quicker. from what i can see of them they appear to be ok yet as in i don't see any pitting or flaking on the rollers or race but i cant see much of it being its still assembled.
Click to expand...

.020" is a LOT of wear for the tapered roller transmission bearings in that sort of application ASSUMING they were set correctly by the last guy in there. If the last guy wasn't careful to be sure that all the cups and cones were perfectly seated before checking the endplay, that COULD explain the problem, and shimming "to spec" would correct it.

However, I would be uncomfortable proceeding without inspecting both bearings and races.

For that matter, what would the two bearings cost to replace vs. all the time and trouble to get back in there, not to mention the metal filings contamination of everything in the transmission and rear end if a bearing IS failing.

Out of curiosity, I just checked, in round numbers about $150 at the dealership.

To SV, in this application, I don't think there's any gears or shims involved to wear, the bearing cones butt up against shoulders on the countershaft, IIRC. Any wear would be in the bearings themselves, and/or the shoulder on the countershaft, or where the cones butt up to in the case, if one of the cups or cones has turned in place.
 
So If it was set at 0.002 from the factory you?ve gained 0.020 in 40 years or the thickness of piece of paper I wouldn?t be to worried about anything to abnormal going on .
cvphoto5697.jpg
 
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