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Old 10-01-2009, 05:38 AM
bhawk bhawk is offline
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2003 sentra
 
Join Date: Apr 2008
Posts: 30
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I just pulled out the service manual for the exact specs on the belt tensions for my 2003 sentra with 1.8 engine.

New generator belt (with air) is 4.5 to 5.0 mm or .177 to .197 inch deflection. Used generator belt is 5.3 to 5.7 mm or .209 to .244 inch. You can see they tell you to tighten a new belt more than a used belt, presumably after a bit of driving that new belt will loosen to their "used belt" specs.

New power steering oil pump belt is 3.9 to 4.4mm or .154 to .173 inch.
Used power steering belt is 4.4 to 4.9mm or .173 to .193 inch.

So, these specs lean to a tighter belt than 1\2 deflection, they indicate more like only a 1\4 inch deflection.
I got these specs from this website, the downloadable pages of a service manual. They are under heading "Engine Maintenance" "Service Data and Specifications" at page MA-39. Check it out for your year and engine size.
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