SWITCH GP-ROCKER 4389517 - Caterpillar

Cylinder Block
The cylinder block is a unique design with a deep counterbore that supports the cylinder liner. The cylinder block also forms the coolant jacket. Two oil manifolds are provided in the cylinder block for engine lubrication. The manifold on the lower right side of the cylinder block provides oil to the following components:
Piston cooling jets
Crankshaft bearings
Oil filter baseThe manifold on the upper left side of the cylinder block provides oil to the following components:
Camshaft bearings
Valve mechanismThe manifold on the right supplies oil to the manifold on the left. The oil travels through the cut above the number one main bearing and the cut above the number four main bearing.
Illustration 1 g00762739
Cylinder liners (1) are seated on a ridge (4) in the middle of the cylinder wall between the crankcase and the coolant jacket. The ridge is created by a counterbore in the cylinder block. The cylinder liners have a lip (2) which rests on the ridge. The seals of the coolant jacket are located in the upper regions and middle regions of the cylinder liners. The lower barrier uses a D-ring seal (3) that is located above the seating surface of the cylinder liner. The upper barrier is the head gasket which is above the coolant jacket.The cylinder block has seven main bearings in order to support the crankshaft. The main bearing caps are fastened to the cylinder block with two bolts per cap.Pistons, Rings, and Connecting Rods
Illustration 2 g00762765
The piston is a two-piece articulated piston. The piston has a forged steel crown (5) and a forged aluminum skirt (6). Both parts are retained by the piston pin to the small end of the connecting rod.The pistons have three rings:
Compression ring
Intermediate ring
Oil ringRings (2) are located in grooves in steel crown (5). The rings seal the crankcase from the combustion gases and the rings also provide control of the engine oil. The design of compression ring (1) is a barrel face with a plasma face coating. The design of intermediate ring (3) is a tapered shape and a chrome finish. Oil ring (4) is double railed with a coil spring expander. The oil ring has a ground profile and a chrome finish.
Illustration 3 g00762786
Connecting rod (8) is a conventional design. The cap is fastened to the shank by two bolts (9) that are threaded into the shank. Each side of the small end of the connecting rod (7) is machined at an angle of 12 degrees in order to fit within the piston cavity. This allows a larger surface area on the piston, and connecting rod in order to minimize bearing load. Crankshaft
The crankshaft converts the linear motion of the pistons into rotational motion. The crankshaft drives a group of gears (front gear train) on the front of the engine. The front gear train provides power for the following components:
Camshaft
Water pump
Engine oil pump
Air compressor
Fuel transfer pump
Accessory driveThe crankshaft is held in place by seven main bearings. The oil holes and the oil grooves in the shell of the upper bearing