High Quality K38 KTA38 QSK38 Main Bearing Set With Thrusting Bearing +0.25 AR12251

Keywords: AR12251 main bearing set +0.25, K38 KTA38 QSK38 crankshaft main bearing kit, 0.25 undersize main bearing with thrust washer, diesel engine bearing shell, excavator engine spare parts, construction machinery aftermarket replacement bearing

Product Overview

Main Bearing Set Part No.AR12251 is +0.25 undersize complete main bearing set including thrusting bearing, compatible with K38, KTA38, QSK38 diesel engines for excavators and heavy‑duty construction machinery. It supports crankshaft radial load, bears axial thrust force, builds stable lubricating oil film and reduces friction loss for overhauled crankshaft journal which has been ground to +0.25 dimension. This repair bearing set fixes typical engine faults such as abnormal knocking noise, metal rattling, low oil pressure, crankshaft axial displacement and bearing melting caused by original bearing wear, scratch and alloy layer peeling. Each main bearing set undergoes strict material test and dimensional tolerance inspection before shipment.

Detailed Specifications

Key Features & Advantages

• ✅ High‑quality bimetallic alloy material, excellent load‑bearing and anti‑friction performance under heavy‑duty working conditions.
• ✅ Precise +0.25 undersize machining dimension, perfect matching for reground crankshaft journal.
• ✅ Good wear‑resistance and anti‑spalling property, effectively prevent crankshaft journal secondary scratch damage.
• ✅ Equipped with matched thrusting bearing, accurately controls crankshaft axial clearance.
• ✅ Reliable surface treatment, extend service life of crankshaft and related engine assemblies.
• ✅ Direct replacement installation, ideal for engine overhaul after crankshaft grinding repair.
• ✅ Effectively eliminate abnormal knocking and low oil pressure troubles caused by worn original bearings.

Application Scope

Fit Equipment: Excavators and heavy‑duty machinery equipped with K38, KTA38, QSK38 diesel engines ‑ Specially used for engine overhaul projects when crankshaft journal has been reground to +0.25 size ‑ Widely applied for engine repair workshops and heavy‑duty equipment maintenance.

Our Company Advantage

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

Packaging & Shipping

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.

Contact Us

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.