Dodge D250 1990 Service Manual page 85

Service Procedures
Page 6-4
Clutch
DODGETurbo Diesel
The friction face of the flywheel should have a uniform
appearance throughout the entire clutch contact area. If there
is evidence of heavy contact on one portion of the wear circle
and a very light contact 180° from that portion, the flywheel
may be improperly mounted or sprung. In either case, a dial
indicator mounted on the clutch housing with the plunger in
contact with the wear circle, should show no more than .76mm
[.003 inch] runout throughout complete rotation of the flywheel.
The friction face of the flywheel should also be free from
excessive discoloration, burned areas, small cracks, grooves
or ridges. Wipe the friction surface of the flywheel with
kerosene, mineral spirits or other suitable solvent.