which way does the center bearing turn on a 2000 nissan frontier 4x4 xe v6
on 2000 Nissan Frontier

on the drive shaft

Asked by for the 2000 Nissan Frontier
Do you mean crankshaft bearings? If you are that deep into engine repairs you need a manual. There is a company that independent auto repair shops get their information from, this same information is available inexpensively for people that work on their own cars.. The information is year make and model specific, covering repair procedures, torque specifications, fluid capacities and specifications, service bulletins, component locations, wiring diagrams ect.... Alldata is very easy to navigate http://bit.ly/AllData_Repair_Manuals_Online
If it is the bearings you are trying to replace look for the locating tang of the bearing that will lock the bearing in the block, the bearing would be pushed out so as to release the locating tang, pushing it in the other direction would lock it tighter in the engine block. The locking tangs of the bearings (upper and lower) are on the same side of the parting lines of the main cap.
No Pat I think he means the carrier bearing for the driveshaft.
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Why would you ask this question?