As a dedicated source factory and foreign trade exporter, we specialize in the design, manufacturing, and supply of precision engine parts. We proudly support custom development for various specifications of Engine Cylinder Liners and Pistons, including those for the Cummins QSB6.7 engine. Choose factory direct sales to guarantee superior quality, exact fitment, and the most competitive pricing for your Diesel Engine Components needs worldwide.
Honour Time Machinery Limited is your international go-to supplier for essential Engine Spare Parts. Our current featured product line focuses on core components for the popular Cummins QSB6.7 engine model, widely used in heavy machinery across the globe. We provide the specific QSB6.7 Piston with Part Number 5255257 (also referred to as 5255257 without symbols) and the matching Cylinder Liner Part Number 4919951 (or 4919951). These precision-machined parts are critical for restoring combustion efficiency and minimizing oil consumption during a complete engine rebuild.
We maintain an extensive inventory to support the world’s leading construction and industrial engine manufacturers. Our primary business covers engine assemblies and spare parts for top brands: cummins, komatsu, Caterpillar, isuzu, kubota, yanmar, and weichai. Our core products include high-wear components like Cylinder Liners, Pistons, Piston Rings, Crankshaft Bearings, Connecting Rod Bearings, Thrust Washers, Overhaul Gasket Kits, Fuel Pumps, Injectors, Crankshafts, Turbochargers, Water Pumps, Oil Pumps, Cylinder Blocks, Cylinder Heads, and Connecting Rods. We specialize in seamless Engine Parts Export, ensuring fast and reliable delivery globally.
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Crucial components and their roles in various engine models:
Connecting Rod: Located between the Piston and Crankshaft. It converts the reciprocating motion of the piston into rotational motion. (Cummins ISX15 Connecting Rod)
Thrust Washer: Positioned around the Crankshaft. Controls the crankshaft's axial movement (end-play). (Komatsu SAA6D114E-3 Thrust Bearing Set)
Cylinder Head Gasket: Located between the Cylinder Head and Cylinder Block. Seals the combustion chambers and coolant/oil passages. (Caterpillar C15 Cylinder Head Gasket)
Oil Cooler: Integrated into the Engine Block or Filter Housing. Cools the engine oil using engine coolant. (Isuzu 4HK1 Oil Cooler Assembly)
Glow Plug: Located in the Cylinder Head (Diesel Engines). Provides heat for cold starting. (Kubota D1105 Glow Plug)
Flywheel: Attached to the rear of the Crankshaft. Stores rotational energy and smooths out engine power delivery. (Yanmar 3TNV88 Flywheel)
Intake Valve: Located in the Cylinder Head. Controls the flow of the air-fuel mixture or air into the cylinder. (Weichai WP7 Intake Valve)
Camshaft: Located in the Engine Block or Cylinder Head. Controls the opening and closing of engine valves. (Cummins L10 Camshaft)
Rocker Arm: Located in the Cylinder Head. Transmits the motion from the camshaft to the valves. (Caterpillar C7 Rocker Arm Assembly)
Belt Tensioner: Mounted on the Front of the Engine. Maintains proper tension on the engine accessory drive belt. (Komatsu PC400-8 Belt Tensioner)
Fault: A Caterpillar D6T Dozer equipped with a C9 engine experiences low oil pressure immediately after starting, sometimes accompanied by a rattling noise.
Cause and Remedy: Low oil pressure often signals an issue with the lubrication system. Potential causes include a failed Oil Pump, clogged oil pickup screen, or excessive clearance in the main or connecting rod bearings (Crankshaft Bearings or Connecting Rod Bearings) due to wear.
Solution: Immediate shutdown is critical to prevent catastrophic damage (like scoring the QSB6.7 Liner 4919951 or seizing the 5255257 Piston). The recommended fix involves dropping the oil pan to inspect the oil pump and pickup tube. If the pump is functional, the next step is measuring bearing clearances. If clearances are out of spec, the crankshaft should be inspected, and new Main Bearings and Connecting Rod Bearings should be installed to restore the necessary oil wedge and pressure. We supply high-quality Engine Bearings and Oil Pumps for all major equipment.
Honour Time Machinery Limited is committed to supplying reliable Engine Overhaul Kits and components to mechanics, dealers, and fleet owners worldwide. Whether you need the Cummins QSB6.7 Piston 5255257 or a full Engine Assembly for Kubota or Isuzu, our team is ready to assist with your specialized heavy machinery parts requirements.
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