Ok i bought a new Harmonic balancer, and I am having a few problems:

1. They are different sizes, the diameters are both 6 3/4in. but the thickness of the outer ring is different, fig 1.
New:1 5/8in. Old: 1 3/16

2. BTDC marking in relation to the key way on the crankshaft is different, fig 1. according to the timing marks on the new one, the marks are 30 degrees apart, fig 1.

ok heres my questions,
1. Is it possible for the outer ring to have moved on the old one?
(the elastomer ring is sticking out bout 1/8 inch)

2.before i took the motor out, it ran good, and i had replaced the distributor 2months ago,and the timing and everything was ok, i set it using the marks on the old balancer


misc. info :
they are the same length on the hub that slips over the crank snout, fig 2. The thickness of the outside ring doesnt really bother me as much, because the old one is a solid outer ring, and the new one is a hollowback one, fig 3. also both dampers weigh the same.
Before i took the motor out, it ran good, and i had replaced the distributor 2months ago,and the timing and everything was ok, i set it using the marks on the old balancer
I am rebuilding the motor, it has 140k miles on it,

 

I think all you need it a correct timing tab for that balancer. The key way is diffrent ,so the timing will still be the same but you need a tab to be at 0 when the balancer is at 0/.


Brian Felts

 

yea the balancer will work, the tpi motors just had the timing mark moved from 12oclock because the intake was blocking it, just use the tape or paint a new one at tdc

 

When I did my motor swap I used my original balancer from my 1988 motor but I inadvertently used the timing cover from the 1974 motor. Now my timing marks are off. You mentioned that it is 30 degrees off and now if I think of your picture, the mark of your old balancer is on the 30 degree mark of the new one. To fix my problem I either need to change the balancer or the timing cover. You may just have to change your timing cover or get the right balancer.
Thanks to your pic I can now do the timing on my car to an actual number. Thanks

 

well i got the right balancer, i needed one with 2:00 timing mark, the one i have is a 12:00 marked balancer,so my problem is al straightened out, thanks for all your responses and im glad i could help you out SC88