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Assessing pinion bearings Posted by Cmyles [Email] (#1126) [Profile/Gallery] (more from Cmyles) on Tue, 30 Jun 2015 07:49:21 In Reply to: Re: SO i bought a spare 5 speed (what to do with it?), RS [Profile/Gallery] , Tue, 30 Jun 2015 05:34:53 Members do not see ads below this line. - Help Keep This Site Online - Signup |
I don't mean to be argumentative here, but i feel like I should point this out. You can not fully assess the condition of either pinion bearing by simply viewing it from the differential case. The ability to feel play in the pinion gear at that location is a unidirectional test: If you can feel play then the bearings are certainly shot but if you don't feel any play the bearings may be just as shot. Consider that the only practical assessment is one that finds and reports worn bearings BEFORE they cause any damage to the gears and other hard parts and the bearing has be spinning fast, and ideally under load, for that.
I'm saying that the only useful TEST of pinion bearings is to listen for them during a road test (unless you have a transmission dyno). There's nothing wrong with pulling the differential and having a look but you can not truly conclude that the pinion bearings are good in that fashion, only that they are bad (if they ARE bad) and then only if they have reached (and probably passed) the point of doing damage. Also, you can't SEE the forward pinion bearing at all and what little you can see of the rear pinion bearing is irrelevant to it's condition unless it's blue or the rollers are stacked in which case you are pretty late in the game.
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