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Subject A better explanation... The extra hole is so the parts are
     
Posted by kkrofft (OH) on August 03, 2008 at 8:59 AM
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In Reply To Both. Oil is not supposed to go anywhere via that hole, posted by zellamay on August 03, 2008 at 01:09 AM
     
Message identical top to bottom halves. Manufacturers don't have to deal with extra parts and worry about a set with no hole going out.
When installed, the bearing halves contact each other at the joint and are then essentially fixed at the diameter they were made to. In a properly sized rod, there is zero clearance behind them. All the clearance is designed to be on the inside next to the journal.

This is not a Nissan specific design every engine I have ever worked on was this way.

KKrofft

     
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