Section 6 - Engine

clutch attaching bolts one turn at a time (to prevent cover distortion) until the diaphragm spring pressure is released.
5. Remove the three clutch pressure plate re­tracting springs, then remove the pressure plate from the clutch cover assembly, Fig. 112. Note the position of the "O" marks on the pressure plate and cover. These must be matched when reassembling in order to maintain proper bal­ance.
NOTE—For ease of servicing, the clutch cover, diaphragm spring and two pivot rings are built up as an assembly. If inspection shows that there is a defect in any of these parts it will be necessary to replace the complete cover assembly.
The first step in connection with inspection of the clutch is to wash all parts (except the throw­out bearing and disc) in clean gasoline or cleaning solvent.
CAUTION—The clutch throwout bearing is per­manently packed with lubricant and should not be soaked in gasoline, as this may dissolve the lubricant from around the bearing balls.
1.    Inspect the pressure plate and flywheel for any indication of scores on the contact surface. Then check the three pressure plate drive lugs for burrs. Make sure that these lugs move freely in the three slots in the cover. Check the clearance between the lugs and the cover; this clearance should be from .002" to .008".
2.   Check the throwout bearing for roughness and free fit on the sleeve of the transmission clutch gear bearing retainer.
3.   Check the run-out of the transmission pilot hole in the clutch housing. Fig. 113. This should be within .008" indicator reading.
4. Check fit of the ball in the throwout fork; this should be snug without end-play, Fig. 114.
Fig. 114—Checking Free Fit of Fork Ball in Clutch Fork
5. Inspect the clutch disc for worn, loose or oil soaked facings, broken springs, rivets loose in hub or "riding." Examine the splines and check to see that they move freely on the splines of the transmission clutch gear. If the splines are worn, the clutch disc should be replaced.
To assure a job that will perform smoothly and effectively for many thousands of miles, all of the foregoing inspections and adjustments must be made.
Clutch Disc
Two diameter clutch discs are used in produc­tion and service. The first or the 9-1/8" disc is used on passenger cars and 1/2-ton trucks. The second or l0-1/4" disc is used on all 3/4 and 1-1/2-ton trucks.
Pilot Bearing
The clutch pilot bearing is a cage roller type Hyatt bearing. This bearing requires attention only when the clutch is removed from the car, at which time it should be removed, cleaned, inspected, and replaced if necessary.
To remove the bearing from the end of the crankshaft it is first necessary to remove the bear­ing retainer. Special puller, K-445, is required to remove the retainer without damaging the roller
This puller is designed with a small diameter which centers into the clutch pilot bearing. A large aligning bushing on the puller can be moved for­ward and centered in the transmission pilot hole in the clutch housing so the retainer will be pulled straight out, and there will be no possibility of the lip of the retainer digging into the bore in the crankshaft. When installing this tool, the tool head should be threaded into the retainer two full turns and, with the clamp in position as shown in
Fig. 113-Checking Run-Out of Transmission Pilot Hole





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