Rear Main Seal Kit Cummins Engine 4B 3.9 – Engine 4BT 3.9 – Engine 6BTA 3.9

The kit provides a seal at the rear of the crankshaft, preventing engine oil from leaking at the point where the crankshaft exits the engine block toward the flywheel/transmission housing. It is therefore installed at the rear of the engine block, on the flywheel side. The sealing component is typically made of a technical elastomer that is resistant to oil and high temperatures, combined with metal support/reinforcement elements.

Compatible engines: 4B, 4BT, 6B, 6BT, 6C, 6CT, 6CTA, ISB, QSB, ISC, QSC, ISL, QSL

However, we recommend checking the ESN/CPL before the sale: not all configurations within the same engine family necessarily use the same oil seal.