How To Measure A Belt For A Car. With the cover removed from the driver pulley, pull the belt past the crankshaft and ensure that there is a gap of about 1/8″ to 3/16″ between the crankshaft and the belt when it’s pulled. How we measure and think about *new* belts :.
Measure the diameters of the small pulley, denoted by d1, and the large pulley, d2. How to measure a belt. With a pencil, mark where the top of their shoulder meets the wall.
Measure the internal length of the belt.
All new belts on our site are spoken of in terms of the total length/circumference, not diameter across a 'circle', like this: Put together the part number: Measure the internal length of the belt. This online length conversion tool is very handy.