Rod bearing noise. Jul 23, 2025 · Rod knock refers to a deep knocking or banging sound that comes from the lower end of the engine. Bad rod bearing will make a knocking, striking and rattling noise. Feb 10, 2026 · Rod bearing issues typically cause a knocking sound that gets louder under acceleration or load, while main bearing wear more commonly leads to low oil pressure and a deeper, more constant rumbling noise. The sound is usually loudest when the engine is under load or when accelerating and becomes more pronounced as engine RPM increases. In this video I discuss the common symptoms of a failing connecting rod bearings. Apr 24, 2025 · Lifter tick vs rod knock—what's the difference? Learn how to identify these engine noises, their causes, potential damage, and how to fix them. This occurs as the result of end-stage bearing wear, which in turn allows a connecting rod to clatter against the crankshaft itself. This sound originates from the bottom of the engine, near the oil pan, and is the direct result of the connecting rod striking the crankshaft journal due to lost clearance. As an engine’s crankshaft Mar 14, 2023 · When the bearings are worn, the piston rods begin rattling against the crankshaft, creating a unique knocking sound. The sound of a failing connecting rod bearing is a distinct, sharp, metallic knock or rap. . It’s caused by excessive clearance between the connecting rod bearing and the crankshaft journal. The only way to repair this is to replace the bearings, which are deep within the engine. Rod knock is a sound that originates within an engine’s crankcase, whenever excessive clearance is present between one or more of an engine’s connecting rods and their corresponding journals. w3pwlh, ffnmn, bxp7, fktjm, si6qg, xoa3ag, fecwo, ipdz, ujeg, jfyv3f,