Usage:
3306, 3306B, 3306C, 3406B and 3406C Truck Engines
Description of Change: The AFRC has been improved to help extend serviceable life of the diaphragm. The edges of components that contact the diaphragm have been smoothed to help prevent damage to the diaphragm. The new diaphragm seal washer will help reduce leakage. A new lock washer will help prevent loosening of the locknut (see the illustration).
Adaptable To: The new 106-6493 Diaphragm Seal Washer is a direct replacement for the former 7W-1691 Diaphragm Seal Washer. The new 115-3358 Lock Washer is an addition to the group. The AFRC improvements are effective with 3306C (9TL4656) Truck Engine and 3406C (8PN1, 3ZJ61100) Truck Engines. The new diaphragm washer and lock nut washer are adaptable to the AFRC's on 3306 and 3306B (63Z1-UP), 3306C (7RJ1-UP, 9TL1-UP), 3406B and 3406C (3ZJ1-UP, 5KJ1-UP, 4MG1-UP, 7FB1-UP) Truck Engines. When servicing the AFRC, smooth edges (see illustration) to provide a surface free of nicks and sharp edges.
1. New 115-3358 Lock Washer. 2. New 106-6493 Diaphragm Seal Washer. 3. Locations where the edges have been smoothed.