342761 Volvo.Penta Radiator hose

Illustration 1 g02872056
Engine Oil Flow During Normal Operation
(1) To rocker arm shaft
(2) To gear bearings in flywheel housing
(3) To fuel injection pump housing, governor and fuel ratio control
(4) Rocker arm shaft
(5) To valve lifters
(6) Camshaft bearings
(7) Piston cooling tubes
(8) Left oil manifold
(9) To timing gear housing
(10) To idler gear shaft
(11) Right oil manifold
(12) Main bearings
(13) Oil supply line to filters on left side of block
(14) Oil filters
(15) Oil supply line to turbocharger
(16) Oil bypass line to right manifold in cylinder block
(17) Filter bypass valve
(18) Cooler bypass line
(19) Cooler bypass valve
(20) Turbocharger
(21) Engine oil cooler
(22) Oil return line from turbocharger
(23) Suction line for scavenge oil pump
(24) Scavenge oil pump
(25) Oil pan
(26) Oil pump suction line
(27) Oil pump
Illustration 2 g03070536
Lubrication System Components "Right Side Of Engine"
(21) Engine oil cooler
(28) Transmission oil cooler
Illustration 3 g03070517
Left Side of Engine
(13) Oil supply line to filters
(14) Oil filters
(25) Oil pan With the engine warm (normal operation), oil comes from oil pan (25) through a suction bell on suction line (26) to oil pump (27). The oil pump sends warm oil, under pressure, to engine oil cooler (21), through an outside oil supply line (13). The outside oil line connects to the oil pan, and through a line inside the oil pan to the other side of the cylinder block. The oil then flows though the filter base, into the oil filters, and back to the oil manifold (8) on the left side of the engine.From the oil manifold (8), oil is sent to the right oil manifold (11) through drilled passages in the cylinder block. These drilled passages connect main bearings (12) and camshaft bearings (6). Oil goes through drilled holes in the crankshaft to give lubrication to the connecting rod bearings. A small amount of oil is sent through tubes (7) to make the pistons cooler. Oil goes through grooves in the bores for the front and rear camshaft bearings and then into passages (5) that connect the valve lifter bores. These passages give oil under pressure for the lubrication of the valve lifters.Oil is sent through passages (1), on front and rear, to rocker arm shafts (4) on both cylinder heads. Holes in the rocker arm shafts let the oil give lubrication to the valve system components in the cylinder headThe fuel injection pump and governor get oil from passage (3) in the cylinder block. There is a small gear pump on the right side of the rear governor housing. This pump sends oil under pressure for the hydraulic operation of the hydra-mechanical governor. The automatic timing advance unit gets oil from the injection pump housing, through the camshaft for the fuel injection pumps.The idler gear bores get oil from passages (10) in the cylinder block. Oil then goes through the shaft for the bearings of the idler gears installed on the front and rear of the cylinder block.The rear gear bearings get oil from an external line (2) that connects to the flywheel housing.Pressure oil is sent to the turbocharger bearings through external supply line (15). The oil goes out of turbocharger (20) back to the top of flywheel housing through oil return line (22). This oil lubricates the gears in the flywheel housing and then goes back to oil pan (25).There is a bypass valve in the oil pump. This bypass valve controls the maximum pressure of the oil from the oil pump. The oil pump can put more oil into the system than is needed. When there is more oil than needed, the oil pressure goes up and the bypass valve will open. The bypass valve allows the oil that is not needed to go back to the inlet oil passage of the oil pump. After lubricating the engine, the oil goes back to the engine oil pan .This lubrication system also has a scavenge oil pump. Scavenge oil pump (24) is connected to and is driven by main oil pump (27). Oil from the small reservoir at the rear of the oil pan is pumped from a suction line (23) into the main reservoir at the front of oil pan (25).When the oil pan is tilted up like on a long slope, the oil returning to oil pan, accumulates at the rear of the oil pan. This accumulation can cause the main reservoir level to decrease enough to stop the oil flow to the oil pump (27).Scavenge oil pump (24) is in operation all the time that the engine is in operation. The scavenge oil pump takes the extra oil from the rear of the oil pan and puts the oil back into the main reservoir at the front of the oil pan.
Illustration 4 g02876117
Flow Of Oil "Engine Cold"
(11) Right oil manifold
(13) Oil supply line to filters
(14) Oil filters
(15) Oil supply line to turbocharger
(16) Oil bypass line to right manifold in cylinder block
(17) Filter bypass valve
(18) Cooler bypass line
(19) Cooler bypass valve.
(20) Turbocharger
(21) Engine oil cooler
(22) Oil return line from turbocharger
(23) Suction line for scavenge oil pump
(24) Scavenge oil pump
(25) Oil pan
(26) Oil pump suction line
(27) Oil pump When the engine is cold, bypass valves (17 and 19 ) open because cold oil with high viscosity causes a restriction to the oil flow through oil cooler (21) and oil filters (14). With the bypass valves open, oil flows directly from the oil pump to the right oil manifold (11) and through bypass lines (16 and 18). This oil flow gives immediate lubrication to all components until the engine becomes warm.When the oil gets warm, the pressure difference in the bypass valves decreases and the bypass valves close. Now there is a normal flow through oil cooler (21) and oil filters (14).The bypass valves will also open when there is a restriction in the oil cooler or oil filter. This action does not let an oil cooler or oil filter with a restriction prevent the lubrication of the engine.Pre-Lube Oil Pump
Illustration 5 g03101119
(1) Pressure switch
(2) Starter motor
(3) Magnetic switch
(4) Timer
(5) Outlet line to block
(6) Inlet line from oil pan
(7) Pre-lube oil pump If equipped,