Verification of the Internal Combustion Engine
The internal combustion engine Cummins 4BT3.9, used in machines such as loaders, dumpers, and wheeled excavators, has come to our service. Our mechanics conducted a thorough verification of the power unit and based on that, we performed an engine overhaul.
Reconditioning of the Crankshaft and Piston System
The first step in the overhaul process was the reconditioning of the crankshaft and piston system components.
The crankshaft was polished, and the connecting rods were completely replaced with new ones. We used new pistons with pins, a complete set of main and connecting rod bearings, as well as a camshaft bearing.
The engine block was restored to nominal parameters.
Cylinder Head and Timing System
The engine head underwent full reconditioning, which included planning, replacement of valve guides, valves, and valve seats.
The camshaft was replaced, which, combined with other new components of the timing system, guarantees precise valve control and optimal engine cycle performance.
Lubrication and Cooling System
We replaced the oil pump and water pump with new ones, ensuring safe operating conditions for the new crankshaft and piston system.
Additionally, a new thermostat and new oil filter were installed, protecting the engine from overheating and contaminants during the initial phase of operation after the overhaul.
Engine Accessories – Reconditioning and Installation
As part of the service work, we reconditioned the turbocharger and injector nozzles, which allows for maintaining the full efficiency of the boost system and ensures proper fuel injection. The replacement of gaskets included a complete set of seals: timing cover gasket, block cover, oil cooler, oil pickup, and crankshaft seal.
Assembly and Testing of the Engine
The engine was professionally assembled by our team, adhering to all service standards. After assembly, it underwent a test on the engine dynamometer, during which stable operating parameters were achieved:
- at 850 rpm – operating temperature 92°C and oil pressure 2.1 bar,
- at 2500 rpm – constant power 100 HP, peak power 117 HP.
The tests confirmed very good condition of the unit and effectiveness of the repair work performed. The engine started without any issues and is ready for further operation.
Cummins Construction Machinery Service – Warranty and Support
The Cummins 4BT3.9 engine after the overhaul is covered by a warranty. Our specialists recommend a check-up after 50 operating hours, which includes not only filter replacement but also inspection of all connections and any potential leaks.
We also offer full service for construction machinery and Cummins diesel engine service – both at our facility and as part of mobile service.
Cummins 4BT3.9 engines are used in a wide range of machines. Example machines: Case 580 Super L, JCB 3CX, Bobcat 873, Hyundai R55-7, Hitachi EX60, Komatsu FG25T-16, Ingersoll Rand VR-90, Genie S-65, Terex TX760, Takeuchi TB175, New Holland LB75, Skyjack SJ8841, Clark C500-Y80, Dynapac CA152, Hamm HD10, Vermeer V8550, Ditch Witch RT115, Bomag BW120, Volvo EC35, Grove RT530C, Yale GDP080, Manitou MT 932, LiuGong 835H, TCM FD30
