GMC 1989 Light Duty Truck Repair Manual page 443

87. T h ru s t Plate
88. S crew
N O T IC E : The in e rtia w e ig h t s e c tio n o f th e
torsional d a m p e r is assem b led to the hub with
ru b b e r type m aterial. The co rre c t installation
p ro c e d u re s (w ith th e p ro p e r to o l) m u s t be
fo llo w e d or m o v e m e n t o f the in ertia w e ig h t
section o f the hub w ill destroy the tuning o f the
torsional dam per.
2. Stud (item A, figure 32) to the crankshaft. Thread
the stud fully into the tapped hole in the crankshaft.
Figure 3 0 — Installing th e C am shaft
Figure 29— C am shaft and C om ponents
B-07892
4.3 LITER V-6 6A3-19
Figure 3 2 — Installing the Torsional D am per
B-07615