146 Manual Drive Trains and Axles
Figure 7-29. Study the types of clutch disc damage. (Luk)
A—Burned disc facing—Oil contamination, slipping clutch,
insufficient clearance adjustment.
B—Hub splines worn—Improper engine-to-transmission align-
ment, damaged input shaft, bad pilot bearing.
C—Worn disc facing—Weak pressure plate springs, normal
wear, scored or cracked flywheel.
D—Damaged hub splines—Transmission drawn into place with
bellhousing bolts.
E—Scored disc facing—Flywheel not machined when needed,
bad pressure plate reused.
F—Wear on hub—Installed backwards, wrong parts.