More Power
02-25-2013, 14:14
I received the following email this morning about an ongoing accessory drive belt problem. I thought some here might either benefit from the information or might have a different solution. Your thoughts....
After about 5 belts and 3 vacuum pumps on my 1996 GMC with 6.5 diesel, I have finally solved the problem as follows.
Remove the tensioner and note the limit stops for the pulley mount arm.
Grind about 3/4 inch of the limit stop that keeps the tensioner pulley from being raised further.
Re mount everything except this time use a 100 inch belt instead of the 101 as per factory specs.
What this does is prevent the tensioner from "locking-over", preventing extreme tension on belt driven components. As noted earlier, 3 vacuum pumps had to be replaced as well as an alternator (bad bearing) and A/C pump for the same reason. Hope this helps someone.
After about 5 belts and 3 vacuum pumps on my 1996 GMC with 6.5 diesel, I have finally solved the problem as follows.
Remove the tensioner and note the limit stops for the pulley mount arm.
Grind about 3/4 inch of the limit stop that keeps the tensioner pulley from being raised further.
Re mount everything except this time use a 100 inch belt instead of the 101 as per factory specs.
What this does is prevent the tensioner from "locking-over", preventing extreme tension on belt driven components. As noted earlier, 3 vacuum pumps had to be replaced as well as an alternator (bad bearing) and A/C pump for the same reason. Hope this helps someone.