WINDOW 3456250 - Caterpillar

Cylinder Block Assembly
Passages supply the lubrication for the crankshaft bearings and the piston crowns. These passages are drilled passages in the oil manifolds. Cooling passages for the top piston ring are located in the top deck of the block. This configuration provides improved rigidity. This configuration will resist the deflection that is caused by combustion.The cylinder liner is an induction hardened liner. A steel spacer plate provides improved reusability and durability.Cylinder Head Assembly
The cylinder head is a one-piece cast iron head. The camshaft is contained within the cylinder head. This improves the rigidity of the valve train. Steel reinforced aluminum bearings are pressed into each journal. The bearings are lubricated under pressure. Bridge dowels have been eliminated as the valve train uses floating valve bridges.Thermal efficiency is enhanced by the use of stainless steel thermal sleeves in each exhaust port. The sleeves reduce the amount of heat rejection to the cooling system. The sleeves then transfer the thermal energy to the turbocharger.The electronic unit injector is mounted in a stainless steel adapter. This adapter has been pressed into the cylinder head injector bore.Pistons, Rings And Connecting Rods
One-Piece Pistons
The piston is a one-piece design that is forged steel. The pistons are cooled by engine oil. The engine oil is sprayed into the cooling chamber of the pistons by the piston cooling jets. The cooling chamber for the piston is formed by the lip that is forged at the top of the piston and the cavity that is behind the ring grooves. The pistons have three rings that are located in grooves in the crown of the piston. The rings seal the combustion gas and the rings prevent excessive amounts of engine oil from entering the combustion chamber. The top ring has a Physical Vapor Deposition (PVD) coated barrel face. This ring is a KEYSTONE ring. The second ring is the intermediate ring. The intermediate ring has a tapered rectangular face with a chrome coating. The third ring is the oil ring. The oil ring is double railed and the ring is ground with a profile. This ring is also coated with chrome. The oil ring has a coil spring expander. There are four holes that are drilled from the piston oil ring groove to the interior of the piston. These holes drain excess oil from the oil ring. The connecting rod is a conventional machined cap design. The cap is secured to the connecting rod by four bolts that are threaded into the connecting rod. There is a lubricant passage that is machined through the shank of the connecting rod in order to provide engine oil to the piston pin.Crankshaft
The crankshaft converts the combustion force in the cylinder into rotating torque. The rotating torque powers the equipment. On this engine, a vibration damper is used at the front of the crankshaft in order to reduce the torsional vibrations. The torsional vibrations can cause damage to the engine.The crankshaft drives a group of gears (front gear train) on the front