North American Clutch & Driveline
Rockford, Illinois
Phone: (800) 383-9204
(815) 282-7960
Fax (815) 282-9160
www.naclutch.com
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8.4.4 Particular attention should be given to the pilot diameter and face where the
bell housing and bearing housing adjoin. The mounting pilot O.D. and mounting face
must be free of protruding metal, rust, corrosion etc., which would prevent the bearing
housing from locating properly in the bell housing bore or against the bell housing face.
An improper fit causes misalignment. Misalignment is a major cause of power take-off
failure.
8.4.5 Configuration C: Maximum allowable bearing movement between snapring (29)
and the housing .015” (.381 mm.)
8.5 Bearing Retainer
8.5.1 Threads must not be damaged. Surface that presses against the bearing or
bearing shims must be smooth, with no metal protrusions above the surface. A small
indentation below the surface is not detrimental.
8.6 Cross Shaft
8.6.1 Be sure the cross shaft moves freely in the bell housing. Remove rust or corrosion
from the cross shaft and the holes in the bell housing. Wear on the cross shaft does
not become detrimental until it inhibits smooth rotation during clutch engagement
(creates a false clutch engagement pressure reading) or allows moisture, dirt, or other
corrosives to enter the housing. This can be prevented by ample greasing through the
grease fittings to keep the cross shaft lubed.
8.6.2 Woodruff key slots must hold the keys straight. If the release yoke has been loose
on the cross shaft the keyways may have one side worn at an angle.
8.7 Clutch Release Yoke
8.7.1 Keyways must not be worn excessively.
8.7.2 Replace if width of cradles is over: .765” (19.43 mm.).
8.8 Drive Shaft
8.8.1 Pilot bearing journal must not be worn. A new pilot bearing should have a sliding-
but-snug fit or tight fit. Replace if the diameter of the pilot is less than shown below.
Various basic sizes are shown.
