Schley ProductsSchley 64500 GM Harmonic Damper Holding Tool
This harmonic damper pulley holding tool was developed to aid in the removal and installation of the crank bolt. The bolts holding these pulleys are extremely tight and without the #64500, removal is extremely difficult at best. In replacing the center bolt after installation of the pulley, factory specifications require up to 240 pounds of torque to seat the pulley properly. Refer to factory specifications for specific requirements. These tools allow the factory torque to be attained.
4.2L Straight 6 cylinder 2003 and later Trailblazer, Envoy, Bravada and 2004 and later Ranier.
3.5L Straight 5 cylinder 2004 and later Colorado & Canyon also
2006 and later Hummer H3.
2.8L Straight 4 cylinder 2005 and later Colorado & Canyon.
2.0L, 2.2L & 2.4L 4 cylinder 2005 and later.
6.0L V-8 2005 and later, 7.0L V-8 2006 and later LS two engines.
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