SEAL-RING 3P2792 - Caterpillar

3306C (7RJ) Truck EnginesDescription of Change: A new bonnet and insert are used in the 4P9827 Fuel Injection Pump Group on the above engines. The new bonnet has an internal spherical spring seat and that requires the new insert. See the illustration. This change is required for the higher injection pressures to prevent bonnet cracking.
Location of the new 6I1327 Bonnet (1) and 7C9966 Insert (2) in the 4P9827 Fuel Injection Pump Group.Adaptable To: The 4P9827 Fuel Injection Pump Group with the new 6I1327 Bonnet and 7C9966 Insert can be used as a direct replacement for the earlier 4P9827 Fuel Injection Pump Group with the 1W9171 Bonnet. But, an earlier 4P9827 Fuel Injection Pump Group with the former 1W9171 Bonnet can NOT be used to replace a 4P9827 Fuel Injection Pump Group with the new 6I1327 Bonnet and 7C9966 Insert. The new 6I1327 Bonnet and 7C9966 Insert can be used as a direct replacement for the 1W9171 Bonnet. But, the 1W9171 Bonnet can NOT be used as a replacement for the new 6I1327 Bonnet and 7C9966 Insert. The new bonnet and insert are in effect with fuel injection pump sequence number 341571, and with 3306C Truck Engine 7RJ2695.New fuel lines groups are required because the new 6I1327 Bonnet is approximately 3 mm (.1 in) longer than the former 1W9171 Bonnet. The new 1005673 and 1005674 Fuel Line Groups are used on engines in Ford Trucks. The new 1004634 and 1004635 Fuel Line Groups are used on other OEM trucks. The new fuel lines can be used with the older bonnets by gently bending the new lines until the nuts can be started without forcing lines into place. Then purge air and tighten fuel line nuts to 40 7 N m (30 5 lb ft). Loosening some of the clamps may be required to service individual lines. Install clamps and tighten them to 2.25 N m (20 lb in).