10 ENGINE SYSTEMS One piece aluminum alloy pistons are fitted with one keystone cut compression ring, one rectangular intermediate compression ring, and a two piece oil control ring. The combustion bowl (in the piston crown) reduces exhaust emissions. The VGT is electronically controlled and hydraulically actuated. The VGT provides boost control at low and high speeds for improved throttle response. An exhaust gas recirculation valve allows water cooled exhaust gases to be fed into the inlet air stream to reduce exhaust emissions. The camshaft is supported by five insert bushings pressed into the crankcase.
Two cam lobes, cam followers, push rods and valve bridges control four valves per cylinder. The camshaft is gear driven from the rear end of the crankshaft. A thrust flange is located between the camshaft gear and the crankcase. Camshaft thrust is controlled with the rear surface of the number 5 cam journal and the cam gear. A closed crankcase breather system recirculates crankcase vapors back into the intake air system. A chassis mounted Charge Air Cooler (CAC), an air-to-air heat exchanger, increases the density of the air charge. Engine operation is controlled by two engine mounted control modules: Hydraulic cam followers maintain zero valve lash and minimize engine noise.
This eliminates periodic adjustment of valve lash. The hydraulic cam followers have rollers which provide excellent cam lobe and cam follower durability. Electronic Control Module (ECM) Injector Drive Module (IDM) The ECM receives signals from engine and chassis mounted sensors. The ECM controls engine operation with the following actuators: The lubrication system uses a crankshaft driven gerotor pump mounted on the front cover. The oil pressure regulator is built into the front cover and is accessible from outside the engine. Lube oil is routed through an oil cooler equipped with a pressure controlled bypass valve.
Lube oil moves through passages in the crankcase to lubricate all internal components and to supply the piston cooling tubes and high pressure pump reservoir. The VGT and air compressor use external oil lines. IPR VGT control valve EGR Glow plug relay The IDM controls fuel injector operation using data from the ECM. EGES295-2 Read all safety instructions in the "Safety Information" section of this manual before doing any procedures. Follow all warnings, cautions, and notes. ©2006 International Truck and Engine Corporation