Clutch - Improper Parts Substitution

Article No. 86-20-13


CLUTCH SYSTEM MALFUNCTION - 6.9L/7.5L -IMPROPER PARTS SUBSTITUTION


LIGHT TRUCK 1983-86 F-250/350

Attempts to improve clutch system performance/durability using Ford parts not designed for the system or "will fit" aftermarket parts can create greater durability/performance concerns. Examples of these issues are:

Release Bearings

^ Bearings may not have a self-aligning feature.

^ Bearing grease may have lower temperature grease properties.

^ Anti-rotation bosses may not prevent rotation of the complete bearing assembly in the original equipment release lever fork.

Pressure Plate

^ Pressure plates may not have sufficient clamp load to accommodate high torque requirements of the 6.9L (D) and 7.5L engines, even though the part may measure as a "larger clutch".

^ Geometric lift/stroke requirements of pressure plates may not be compatible with the design of the Ford vehicle system.

Disc

^ Friction properties of discs may not be sufficient for torque requirements of the 6.9L (D) and 7.5L engines.

^ Disc thickness may not be compatible to the Ford system.

^ Disc tuning may not be developed for the 6.9L diesel or 7.5L gasoline engine. This can result in transmission gear rattle (growl).

If the clutch system is experiencing performance/durability concerns, improper parts should be identified and removed. Concerns with systems having proper pans should be serviced in accordance with TSB 86-20-10.

OTHER APPLICABLE ARTICLES: 86-20-10
WARRANTY STATUS: "INFORMATION ONLY"