Cummins 3035026 Injector Tube Seal O-Ring

The Cummins 3035026 is a fuel injector tube seal O-ring designed for M11, ISM, and QSM series diesel engines. It seals the injector tube (sleeve) to the cylinder head, preventing combustion gas and fuel leakage into the coolant or crankcase. Constructed from high-temperature Viton (FKM) elastomer to withstand diesel fuel compatibility and thermal cycling. This seal is installed onto the injector sleeve (Cummins 3417717) during cylinder head assembly or injector replacement. Weight is approximately 5 grams. Sold individually; typically replaced in sets of six per engine.