SEAL-WEARBAND 4737449 - Caterpillar

Cooling System Components
Water Pump
The centrifugal-type water pump has two seals. One prevents leakage of water, and the other prevents leakage of lubricant.An opening in the bottom of the pump housing allows any leakage at the water seal or the rear bearing oil seal to escape.Fan
The fan is driven by two V-belts, from a pulley on the crankshaft. Belt tension is adjusted by moving the clamp assembly which includes the fan mounting and pulley.Basic Block
Cylinder Block
The cylinder block has six cylinders arranged inline. There are seven main bearings that support the crankshaft. Thrust bearings installed on the rear main bearing web control the end play of the crankshaft.The cylinder block has cylinder liners that can be replaced. The top surface (deck) of the cylinder block is counterbored for the liner flange.Pistons, Rings And Connecting Rods
The cast aluminum piston has three rings; two compression rings and one oil ring. All rings are located above the piston pin bore. The two compression rings are of the KEYSTONE type and are installed in an iron band that is cast into the piston. KEYSTONE rings have a tapered shape and the movement of the rings in the piston groove (also of tapered shape) results in a constantly changing clearance (scrubbing action) between the ring and the groove. This action results in a reduction of carbon deposit and possible sticking of rings.The oil ring is a standard (conventional) type and is spring loaded. Holes in the oil ring groove provide for the return of oil to the crankcase.The piston pin bore in the piston is offset (moved away) from the center of the piston .030 in. (0.76 mm). The full floating piston pin is held in the piston by two snap rings which fit into grooves in the piston pin bore.The piston pin end of the connecting rod is tapered to give more bearing surface at the area of highest load. The connecting rod is installed on the piston with the bearing tab slots on the same side as the "V" mark on the piston.Crankshaft
The crankshaft changes the combustion forces in the cylinder into usable rotating torque which powers the machine. There is a gear at the front of the crankshaft that drives the timing gears and the engine oil pump. The connecting rod bearing surfaces get oil for lubrication through passages drilled in the crankshaft. Lip seals and wear sleeves are used at both ends of the crankshaft to control oil leakage.Vibration Damper
The twisting of the crankshaft, due to the regular power impacts along its length, is called twisting (torsional) vibration. The vibration damper is installed on the front end of the crankshaft. It is used for reduction of torsional vibrations and stops the vibration from building up to amounts that cause damage.The damper is made of a flywheel ring (1) connected to an inner hub (3) by a rubber ring (2). The rubber makes a flexible coupling between the flywheel ring and the inner hub.
CROSS SECTION OF A VIBRATION DAMPER (Typical Example)
1.