Slant 6- Idle and Running

Do this simple test to see if the harmonic balancer is slipping:
Extend the timing mark to the front pulley like this (marked in yellow)...

FBD6F1A7-2979-4262-9960-915488543C18.jpeg

Now run the motor for a few seconds. If the outer ring on the balancer is slipping the lines will no longer line up as the outer pulley is bolted to the inner section of the balancer and the timing mark on the balancer is on the outer ring.