Sealing O-Ring Cummins Engine ISB – Engine QSB

O-Ring Seal Cummins Engine ISB 6.7 – Engine QSB 6.7

It is located between the oil pump and its housing or fitting, providing a static seal between mating components and preventing leaks of oil or other fluids in the circuit where it is installed. It also appears in the section on the lubricating oil system/oil pump, but the exact location may vary depending on the CPL and configuration.

Observed on 6C 8.3 / 6CT / 6CTA, ISC 8.3, QSC 8.3, ISL 8.9/9, QSL 8.9/9, QSB 6.7, and ISB 6.7 engines.

We always recommend checking the ESN and CPL in the Cummins OEM catalog, because the same O-ring is used across different engine families, and the quantity and location may vary depending on the engine configuration.