Son brought the van home last week with the fan belt 1/2 shredded. 351 Ford w/ AC
i replaced the belt - it walked to the front of the Alt pulley as soon as I fired it up
replaced the tensioner and pulley since its right ahead of the alternator - same result, got a dealer one w steel pulley, same result.
used a ruler and checked pulley alignment. Everything but the Alt looks in line, it sits back about 1/16"
pulled alternator - no place or way to adjust. Since it was the original with 180K on it I thought maybe something internal had worn to allow the pulley to move back
replaced the alternator - pulley in same location - back about 1/16", belt walks right off 1-2 ribs to the front
fixed idler pulley still OEM so pulled it got a new dealer one - same result
im stumped at this point
Tuesday, June 14th, 2011 AT 3:35 PM