Engine System - Operation/General information CTM3274 (01JUL99) 205-3 Saran Liter Engines 060799 PN=316 GENERAL INFORMATION Model 3029, 4039, 4045, 6059 and 6068 engines are The camshaft, supported integrally in cylinder block, vertical, in-line, valve in head, 4-stroke diesel engines. is driven by an intermediate gear of the timing gear train via the crankshaft gear. The camshaft cams The direct fuel injection is effected by means of a determine time and rate of opening of each valve and distributor-type fuel injection pump, which is driven by actuate the fuel transfer pump. an intermediate gear in the timing gear train via the crankshaft gear.
The intake and exhaust valves are supported in the cylinder head. The valve stems slide in bores in the The “wet” cylinder liners (liner forms cylinder and is cylinder head. The rocker arm shaft assembly is fitted surrounded with coolant) can be replaced individually. on top of the cylinder head. The pistons are forged aluminium alloy. The outer The engine is supplied with lubricating oil by a gear surface of the pistons is cam ground. The piston pump. The lubricating oil passes through a full-flow oil crown has a cut-out swirl cup with a truncated cone filter in the main oil circuit. To ensure engine in the center.
Each piston has two compression rings lubrication, the oil filter is provided with a by-pass which form a seal between combustion chamber and valve which opens when the filter element is crankshaft housing and an oil control ring which restricted. On most engines, engine oil is cooled by controls lubrication between piston and wall of liner. means of an oil cooler mounted externally on the All piston rings are located above the piston pin. cylinder block. Engine oil passes through the oil cooler before flowing to the oil filter. A by-pass valve The hardened piston pins are fully-floating and held in located between oil pump and main gallery relieves position by means of snap rings.
any pressure build-up in this area. The crankshaft is a one-piece, heat treated, steel The engine has a pressurized cooling system, forging or cast iron. It is supported in replaceable consisting of radiator, water pump, multi-blade fan two-piece main bearings machined to close and one or two thermostats. tolerances. The rear thrust bearing has a flange on each side to support crankshaft thrust and to limit Some engines are equipped with a turbocharger. end play. Operated by exhaust gases, the turbocharger draws in filtered air to the combustion chambers. The connecting rods are provided with a replaceable bronze bushing as bearing surface for the piston pins.
Some other engines are designed and built with a Whereas the replaceable steel-backed bearing insert turbocharger and an air-to-air aftercooler. Air-to-air halves are aluminium lined and tin plated. aftercooler cools the turbocharger compressor discharge air by routing it through a heat exchanger (usually mounted in front of radiator) before it enters the intake manifold. The heat exchanger uses no liquid coolant, but relies on air flow to cool the charge air. CD,3274,G205,1 -19-15MAY92 205 3