Archived help? vibration damper orientation

[Hpark]

Does anyone know how to correctly orient the vibration damper to the crankshaft?



To make a long story short. Please pardon my ignorance in advance. I have a 97' 3500 QC, 4x4 5spd, 125k. In an attempt to open the timing case cover to do a tab fix on the kdp. One of my personel was assigned to take off everthing required to do the job. (not trying to shift the blame, I know it's my fault!) In the proccess, the orientation of the vibration damper was not noted as it was being unbolted from the crankshaft. The vibration damper has four bolts which hold it to the crankshaft. 12:00, 3:00, 6:00, & 9:00 o'clock positions. There are two square notches cut into the perimeter of the V. D. at 12:00 & 6:00 positions, also there is a small hole drilled on the outer flange, facing the engine block at 2:30 o'clock position. I am hesitant to put it back togather without being sure as to the original orientation. Any help on this is greatly appreciated as the rig is down and it serves as our refueling vehicle.

P. S. The KDP was protruding about 3/16" when we took the cover off. Thanks for all the postings. No doubt it would have fallen out eventually.

 

[Phil Stuart]

Just my input here....

In rebuilding small block gasser Mopars I do know that the bolt pattern on the dampers is what they call asymmetrical (I think that's it) in that it will only allow the bolts to go in one way.



Now I don't think that if the bolt pattern was symmetrical (meaning that the bolt pattern is even)that it would make any difference in installation. just my . 02 cents



Phil

 

[MidwestMotorman]

asymetrical

When checking for asymetrical patterns on any motor, compare the crank pulley with the balancer holes. Just put the two together and turn one or the other. If the holes line up in any position, it is nonasymetrical.

 

[kaffine krazed]

As long as the bolt holes line up your fine. The dampner is not balanced with the crankshaft.

 

[Phil Stuart]

Yeah! that's it!

Originally posted by kaffine krazed

As long as the bolt holes line up your fine. The dampner is not balanced with the crankshaft.

I agree!



Phil

 

[dremelts]

As others have already said: the orientation of the damper is not critical. The notches are for the tach sensor, they don't sense the position of the crank, just the rotation speed.



When replacing the tach pickup sensor use a non-magnetic spacer about . 050 (fifty thousandths) thick.

 

[Hpark]

mahalo for all the replies re: V.D. install.

Thanks for all the helpful info on the V. D. orientation.

I think I'll try putting the rig back together tommorrow.

The tab fix went OK. I don't know how anyone can get the crank seal on without taking the cover off the engine though. Having it out and pressing it in a vice was a life saver.

mahalo nui loa!