CUMMINS-4BT-6BT-VALVE-SEAT-EX

3904105 is an exhaust valve seat insert for Cummins 4BT and 6BT engines, giving the exhaust valve a hardened seating surface in the cylinder head. Because exhaust seats handle combusted gas at higher temperature than intake seats, they're the more common of the two to need replacement, and a seat that's recessed or pitted reduces compression on that cylinder in a way that a compression test will usually confirm. Orange.net.za stocks this part for fast dispatch across South Africa.