Lafayette 3608 Engine BJQMZ00 - Caterpillar

Illustration 1. Components of a fuel injection pump group.B. Be sure the fuel injection pump is completely seated in the fuel injection pump housing when the O-ring seal and bushing are installed. Because of higher spring force, the 6V7050 Compressor Group must be used to seat the fuel injection pumps in 3406 Engines with new scroll fuel systems. See Illustration 2.C. Tighten the bushing, with the pump firmly seated in the housing, until the bushing contacts the pump. Then remove the tooling and tighten the bushing to the correct torque. Failure to have the fuel injection pump correctly seated in the fuel injection pump housing when the O-ring seal and bushing are installed, can cause the O-ring seal to be damaged. The result can be a fuel leak.
Illustration 2. 6V7050 Compressor Group used to install fuel injection pumps in the fuel injection pump housing.