The Foundation of Power: Why Main Bearings Matter in Your Cummins 4BT Engine Every diesel engine depends on components working in perfect harmony, but few parts are as critical to engine survival as main bearings. These seemingly simple components carry the enormous responsibility of supporting your engine’s crankshaft while it spins thousands of times per minute under extreme loads. For Cummins 4BT engines, the quality of the main bearings directly determines whether your engine delivers years of reliable service or suffers catastrophic failure. Visit Us:- https://www.nadieselparts.com/cummins-4bt-main-bearings-engine-foundation-power/