Piston 3934860 For 6BT QSB4.5 B4.5 4BT 4D102 ISB4.5 QSK19 QSL9 6CT QSB5.9 Engine

Keywords: 3934860 piston, 6BT QSB4.5 B4.5 4BT 4D102 ISB4.5 QSK19 QSL9 6CT QSB5.9 engine piston, excavator diesel engine piston spare parts, construction machinery engine replacement piston, aftermarket engine piston

🔹Product Overview

Piston Part No.3934860 is a core reciprocating moving component for multi‑model diesel engines including 6BT, QSB4.5, B4.5, 4BT, 4D102, ISB4.5, QSK19, QSL9, 6CT, QSB5.9, widely used on excavators and heavy‑duty construction machinery. It bears high‑temperature gas pressure inside cylinder, converts combustion energy into mechanical power, cooperates with piston rings to realize gas sealing and heat transfer. This replacement piston solves common engine failures such as piston crown ablation, skirt wear, crack and ring‑groove damage caused by long‑time heavy‑load working, high‑temperature operation and poor lubrication, which will lead to insufficient power, burning oil and abnormal knocking noise. Each piston passes strict hardness test, dimensional inspection and appearance checking before delivery.

🔹Detailed Specifications

🔹Key Features & Advantages

• High‑performance aluminum alloy material, excellent high‑temperature resistance, thermal conductivity and structural strength under heavy‑duty engine operating conditions.
• Precision machined piston skirt, ring grooves and pin bore, guarantee good fitting clearance with cylinder liner and piston pin.
• Optimized surface treatment, reduce friction loss, improve wear‑resistance and extend service life.
• Effectively resolve engine oil burning, power shortage and cylinder knocking caused by damaged original piston.
• Strict dimension consistency, direct fit for multi‑series engine overhaul and repair projects.

🔹Application Scope ‑

Fit Equipment: Excavators and heavy‑duty machinery equipped with above‑mentioned series diesel engines ‑ Widely applied for engine repair workshops and routine equipment maintenance projects.

🔹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 wooden case packing, prevent collision and scratch 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.