mechanical engineering

LUBRICATION SYSTEM The engine oil pressure has a normal operating range from 345 to 480 kPa (50 to 70 psi) and will be approximately 450 kPa (65 psi) at full load rpm. Flow of oil through the engine at rated rpm is approximately 340 litres/min (90 gpm). In this diagram of the lubrication system, we see the oil reservoir (sump in the oil pan), the oil pump (1) with a pressure relief valve (2); the oil cooler (3) with a bypass valve (2); the oil line from the cooler to the oil filter base/housing (4); with bypass valve (2) [one bypass valve for each filter]. The oil goes from the oil filters through the oil line to the oil elbow (manifold) on the left top front of the block. The oil pump takes oil from the sump and sends it through the oil cooler, oil filters, and into the oil elbow (manifold). Oil is sent to the turbochargers through outside lines (9) that are connected to the elbow on the left from (if turbocharger is top mounted). Turbocharger drain lines empty into the camshaft compa...

Cooling System COOLING SYSTEM SCHEMATIC This diagram shows the basic cooling system. We can use it to see the components of the system and see how they are connected. In the diagram, we see the engine block, cylinder heads (separate heads for each cylinder), coolant manifold, housing of the temperature regulators (thermostats), water outlets bypass line from regulator housing to water pump, water pump, water inlet from radiator or heat exchanger, coolant line to the aftercooler, and the oil cooler. 1. water pump 2. oil cooler 3. cylinder heads 4. water manifold (right side) 5. aftercooler 6. temperature regulator housing 7. bypass line from regulator housing to water pump. COOLING SYSTEM FLOW Coolant flow comes from the elbow which is connected to the radiator or other heat exchanger into the center of the water pump. The cooler flow is divided at the outlet of the water pump. One partflows to the aftercooler; the other part to the oil cooler. Coolant sent to the aftercooler goes throu...

Clean each crankcase breather element every 1000 service hours or oil change. Wash the breather with clean solvent or clean diesel fuel. Air Induction system AIR INDUCTION AND EXHAUST SYSTEM In this diagram of the air induction and exhaust system, we seethe turbochargers (two), the air inlet system piping, theaftercooler, the air inlet plenum and elbows, the inletport and intake valves, the combustion chamber, the exhaust valves and the exhaust manifolds. The location of the air inlet system, exhaust manifolds, turbochargers, piping, aftercooler and air plenum are all in the center of the vee of the block. Intake air comes through the air cleaners (not shown) and into the compressor inlet of each turbocharger. Velocity of the air is increased by the turbocharger compressor impeller. The air is sent through the piping into the aftercooler inlet where it has increased in pressure and temperature. The air then goes down through the aftercooler into the plenum chamber in the center of the ...

CRANKCASE EXPLOSION RELIEF VALVES Crankcase explosion relief valves, seen here, are normally attachments but are required on marine engines. They are available for industrial and generator set arrangements. These valves relieve the pressure of an explosion in the crankcase. An explosion is possible when combustible gases start to burn because of heat or sparks. A common cause of ignition is heat from a failed bearing. Explosion relief valves open to release the pressure of an explosion - then close to prevent a second cycle of combustion. Basically they stop oxygen from getting in, which would permit further combustion. This is the idler pulley used on some arrangements to tighten or loosen the belts. To tighten the fan (drive) belts, loosen the bolts that hold the bracket of the idler pulley. Move the idler pulley out until the tension of the belt is correct and tighten the bolts. Install new belts if they show signs of too much wear. Belts come in sets. If one belt is bad, install a...