Deflection Method

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NOTE: If the belt is worn or damaged, replace it.

Apply a force of 22 Lbs. (98 N) and measure the deflection between the alternator and crankshaft pulley. See Fig 1Deflection:

Used Belt:37 -.45" (9.5 -11.5 mm)
New Belt:28 -.31" (7.0 - 8.0 mm)

Fig 1: Inspecting Alternator Belt Deflection

Courtesy of AMERICAN HONDA MOTOR CO., INC.