Engine Bearing K19 QSK19 Crankshaft Main Bearing AR12271

Keywords: AR12271 crankshaft main bearing, K19 QSK19 main bearing shell, diesel engine main bearing, excavator engine spare parts, construction machinery engine bearing, aftermarket replacement main bearing

Crankshaft Main Bearing Part No.AR12271 is critical crankshaft support bearing shell for K19, QSK19 diesel engines, widely installed on excavators and heavy‑duty construction machinery. It bears large radial load of crankshaft during engine running, forms stable lubricating oil film and reduces friction loss between crankshaft and engine cylinder block. This replacement main bearing solves typical engine malfunctions including abnormal knocking noise, metal clatter, low engine oil pressure and bearing burn‑out caused by original bearing wear, surface scratch and alloy layer peeling. Each main bearing set passes strict material inspection and dimensional tolerance test before delivery.

• Premium bimetallic alloy raw material, excellent load‑bearing and anti‑friction performance under heavy‑load working environment.
• Precise dimension control, good fitting tolerance, maintain stable lubricating oil film.
• Fine surface finishing, resist scratch and alloy layer peeling, extend service life.
• Exact installation size, direct fit, perfect for K19 QSK19 engine overhaul maintenance.
• Effectively resolve abnormal knocking noise and low oil pressure problems resulted from worn original bearing.

Fit Equipment: Excavators and heavy‑duty machinery equipped with K19, QSK19 diesel engine ‑ Widely applied for engine repair workshops and routine equipment maintenance projects.

We are professional supplier of full‑range construction machinery spare parts, supplying engine parts, hydraulic parts, electrical parts, seal kits and complete overhaul kits. ‑ Large ready stock for various machinery spare parts ‑ Factory‑direct wholesale competitive price ‑ Mixed‑order & one‑stop spare‑parts procurement supported ‑ Professional part‑number matching technical support service

Neutral export carton box with shock‑proof inner packing, avoid scratch and collision during long‑distance transportation ‑ Multiple shipping options: sea freight, air freight, international express for small trial orders ‑ Export documents such as Commercial Invoice, Packing List can be provided.

If you need more excavator spare parts or other construction machinery replacement components, please send your parts list to us. We will offer our best quotation for you quickly.