0307055 JOHNSON SCREW, Lower front cover

Radiator Or Heat Exchanger
COOLING SYSTEM SCHEMATIC
1 - Aftercooler. 2 - Water temperature regulator housing. 3-Radiator. 4-Cylinder head. 5-Diesel engine cylinder block. 6-Diesel engine water pump. 7-Oil cooler.Coolant is circulated by a gear driven, centrifugal-type water pump. Temperature regulators located at the front of the cylinder head, restrict coolant flow through the radiator or heat exchanger, until the coolant reaches operating temperature.The water pump has two outlets. One outlet directs coolant to the aftercooler. The other outlet directs coolant to the engine oil cooler. Both streams join and are directed to the area around the cylinder liners, into the cylinder head, and then to the water temperature regulator housing.Until the coolant reaches the temperature required to open the temperature regulators, coolant bypasses the radiator or heat exchanger and flows directly back to the water pump.A pressure relief cap assembly is used to control the pressure in the cooling system. The cap allows pressure (and some water if the cooling system is too full) to escape when system pressure exceeds the relief pressure of the cap.Raw Water Aftercooled With Expansion Tank And Heat Exchanger
Jacket water is circulated by a gear-driven, centrifugal-type water pump. Water temperature regulators located at the front of the engine, bypass coolant back to the water pump until the coolant reaches operating temperature.Coolant from the diesel engine water pump is directed through a passage in the flywheel housing to the diesel engine oil cooler. From the diesel engine oil cooler, coolant is directed through the marine gear oil cooler into the cylinder block, around the cylinder liners, and into the cylinder head to cool the area around the precombustion chambers and cylinder head valves. Coolant is then directed to the water temperature regulator housing.
COOLING SYSTEM SCHEMATIC
1-Aftercooler. 2-Cylinder head. 3-Water temperature regulator housing. 4-Expansion tank. 5-Raw water pump. 6-Heat exchanger. 7-Diesel engine oil cooler. 8-Marine gear oil cooler. 9-Diesel engine water pump. 10-Turbocharger heat shield. 11 - Exhaust manifold heat shield. 12 - Diesel engine cylinder block.Coolant is also directed to the turbocharger and exhaust manifold heat shields. The coolant then flows to the water temperature regulator housing where it joins with coolant from the cylinder head. Until the coolant reaches normal operating temperature, it is bypassed back to the water pump.Raw water is circulated by a gear-driven, centrifugal-type water pump. Coolant is directed to the aftercooler, to the heat exchanger and then to waste.A pressure relief cap assembly is used to control the pressure in the cooling system. The cap allows pressure (and some water if the cooling system is too full) to escape when system pressure exceeds the relief pressure of the cap.Keel Cooled (Marine)
Coolant is circulated by a gear-driven centrifugal type water pump. Temperature regulators located at the front of the engine, bypass coolant flow back to the water pump until the coolant reaches normal operating temperature.Coolant flow is divided at the water pump. A portion of the coolant is directed to the aftercooler, and then flows into the cylinder block. The remainder of the coolant flows through the engine oil cooler to the marine gear oil cooler, and then enters the cylinder block. Coolant from the pump is also directed to the turbocharger water shield, exhaust manifold water shield, and then to the temperature regulator. Coolant in the cylinder block is directed around the cylinder liners, into the cylinder head, around the pre-combustion chambers and then to the temperature regulator housing.
COOLING SYSTEM SCHEMATIC
1-Aftercooler. 2-Cylinder head. 3-Water temperature regulator housing. 4-Expansion tank. 5-Cylinder block. 6-Diesel engine oil cooler. 7-Marine gear oil cooler. 8-Diesel engine water pump. 9-Turbocharger and exhaust manifold water shields. 10-Keel cooler.When the coolant reaches normal operating temperature, the temperature regulators direct the coolant to the keel cooler and then to the expansion tank.A pressure relief cap assembly is used to control the pressure in the cooling system. The cap allows pressure (and some water if the cooling system is too full) to escape when system pressure exceeds the relief pressure of the cap.Lubrication System
LUBRICATION SYSTEM COMPONENTS
1-Camshaft journal oil supply line. 2-Turbocharger oil supply line. 3-Oil filter. 4-Oil manifold in cylinder block. 5-Turbocharger oil drain line. 6-Oil pump (located within oil pan). 7-Oil pan (sump). 8-Oil cooler.The lubrication system consists of a sump (oil pan), oil pump, oil cooler and oil filter. The engine contains an oil manifold and oil passages to direct lubricant to the various components.The oil pump draws lubricant from the sump and forces it through the oil cooler, oil filter, and then into the oil manifold. Oil flows through connecting passages to lubricate the engine components. A regulating valve in the pump body controls the maximum pressure of the oil from the pump.When the engine is started, the lubricating oil in the oil pan is cold (cool). This cool oil forces bypass valves in the oil filter base to open, and allows an immediate oil flow through the engine. When pressure through the oil cooler and oil filter has been equalized, the turbocharger lubrication valve closes. Filtered oil is then delivered to the turbocharger.As oil viscosity and pressure decrease the oil filter bypass valve closes. Oil temperature continues to increase and the oil cooler bypass valve closes. Oil now flows through the oil cooler and oil filter before reaching the engine components.A contaminated or restricted oil filter element will not prevent lubricating oil from being delivered to the engine components. The oil filter bypass valve will open, allowing oil to bypass the element.An oil manifold, cast into the cylinder block, directs lubricant to the main bearing supply passages. Oil is also directed up through the cylinder head to lubricate the camshaft journals and the camshaft idler (drive) gears.Oil spray orifices in the cylinder block spray oil on the underside of the pistons. This cools the pistons and provides lubrication for the piston pins, cylinder walls and piston rings.The connecting rod bearings receive oil through drilled passages in the crankshaft between the main bearing journals and connecting rod journals.When the engine is warm and running at rated speed, the oil