jmaxj
NAXJA Forum User
- Location
- in My shorts.
i keep shredding my serpantine belt on my 91 xj with the 4.0ho and can't figure it out there is nothing that i can see that it's hitting on so any help would be appreciated
thanks
thanks
Erik the Red said:Chances are your harmonic dampener is failing and has moved out of alignment in relation to the serpentine belt. The dampener is attached to the crank stub and is a two piece affair that contains a concentric vibration dampener pressed between the inner wheel and outer pulley ring. When the rubber gives out, the outer ring of the dampener begins to creep against the edge of the serpentine belt.
Erik
88 Comanche
Erik the Red said:I should have added that if your dampener is the culprit, it'll need to be replaced.
Erik
jmaxj said:well there is a piece of rubber sticking out of it(the dampener)would that cause it?
jmaxj said:yeah its about five steps closer than what i was thanks but one more question, how much do they usually run and if the rubber in a used one is good would that be ok?
Greg Smith said:Get a new one not a used one otherwise the problem will soon come back. Also you need a harmonic balancer for pre 99s I believe since they changed the design thereafter and it wont fit on yours. An aftermarket one is usually available. On the install be careful not to damage the crank treads when drawing down the balancer on to the crankshaft. To reinstall the harmonic use a stud and nut in the end the crank to draw down the balancer on to the crank. To reduce tension while doing so hit on the inner ring a few taps w. a hammer after every couple of turns of the wrench. The next turn of the wrench will then be easier. Using this method is similar to the method in the factory manual and helps avoid stripping threads (when using the bolt instead of stud method or due to excess tension) inside the crank. Remember to line up the woodruff key slot on the balancer with the woodruff key on the crankshaft (it may only bevisible just inside the t-case opening for the crank end). Good Luck. Greg