CARRIER 6G2295 - Caterpillar

Industrial Engine: 3406C (S/N: 3ER1-UP)Track-Type Tractor: D8R (S/N: 9EM1-UP)Introduction
The problem that is identified below does not have a permanent solution. Until a permanent solution is available, use the solution that is identified below.Problem
Some 3406C Engines have experienced fuel leakage at the 131-3719 O-Ring Seal under the pump retainer bushing. This issue has been accompanied by low fuel pressure fault codes and external fuel leakage. Most of the failures have occurred on machines with less than 1100 hrs of service. When the retainer bushing is removed, the seal is found damaged.Solution
Caterpillar is aware of this problem. As an interim repair, replace any damaged seals with same part number. Use service tooling as defined in the Testing & Adjusting, SENR1028 procedure when servicing fuel pumps.
Illustration 1 g03171138
(1) 131-3719 O-Ring Seal Special care is required when assembling the retainer bushing to the pump housing. Before installing the retainer bushing and seal into the bore, fully depress the pump assembly into the bore. Fully depress the pump assembly to allow the O-ring seal to be inserted below the threads. While the pump assembly is depressed, thread the retainer bushing into place. If the O-ring seal is not inserted past the threads, the seal may be damaged when the retainer bushing is threaded into place.