North American Clutch & Driveline
Rockford, Illinois
Phone: (800) 383-9204
(815) 282-7960
Fax (815) 282-9160
www.naclutch.com
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8.3.2 Threads for the bearing retainer should not be damaged.
8.3.3 If a bearing failure has occurred, be sure the bearing has not spun in the housing,
destroying the shoulder or bore contacted by the bearing. Although the moveable
bearing retainer will compensate for small amounts of shoulder wear, it is imperative
the bearing contact the housing only at the O.D. of the race, and not anywhere else on
the bearing in its assembled and adjusted position.
8.3.4 The mounting pilot O.D. and mounting face must be free of protruding metal,
rust corrosion etc., which would prevent the housing from locating properly in the
flywheel housing bore or against the flywheel housing face. An improper fit causes
misalignment. Misalignment is a major cause of power take-off failure.
8.3.5 (2-piece designs: Configurations A, C, F, and G only) The mounting pilot I.D. and
mounting face that locate the bearing housing 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.
8.3.6 Cross shaft holes should not be worn more than .015” (.381 mm.) out of round.
A little wear does not render the parts unserviceable, but excessive wear can cause
binding of the cross shaft under load during clutch engagement.
8.4 Bearing Housing
8.4.1 Check the bearing fit. Bearing races usually are designed with a sliding or
slightly snug fit in the housing bore. They should not have side movement in the bore.
Labyrinth seal bores at the output end of the bearing housing should be round, not
worn oval and should be approximately .020” - .025” (.508 mm. - .635 mm.) diameter
larger than the drive shaft.
8.4.2 Threads for the bearing retainer should not be damaged.
8.4.3 If a bearing failure has occurred, be sure the bearing has not spun in the housing,
destroying the shoulder or bore contacted by the bearing. Although the moveable
bearing retainer will compensate for small amounts of shoulder wear, it is imperative
the bearing contact the housing only at the O.D. of the race, and not anywhere else on
the bearing in its assembled and adjusted position.
