877072 Volvo.Penta Valve stem seal

Illustration 1 g00683584
Separate Circuit Cooling System Schematic
(1) Oil temperature regulator
(2) Oil flow
(3) Turbocharger
(4) Cylinder block and cylinder head
(5) Oil coolers
(6) Inlet air
(7) Aftercooler
(8) Right side water pump
(9) Left side water pump
(10) Expansion tank
(11) Water temperature regulator housing
(12) Heat exchanger
(13) Raw water pump
(14) Heat exchanger
Illustration 2 g00683740
Separate Circuit Cooling System
(1) Coolant outlet to the heat exchanger (jacket water)
(2) Mixer housing
(3) Coolant outlet to the heat exchanger (oil cooler and aftercooler circuit)
(4) Aftercooler housings
(5) Turbocharger coolant return tube
(6) Turbochargers
(7) Turbocharger coolant supply tubes
(8) Water manifolds
(9) Oil coolers
(10) Elbow
(11) Right side water pump (jacket water)
(12) Coolant inlet from the expansion tank (jacket water)
(13) Coolant inlet from the heat exchanger (oil cooler and aftercooler circuit)
(14) Left side water pump (oil cooler and aftercooler circuit)
(15) Oil cooler bonnet
(16) Elbow Oil Cooler And Aftercooler Circuit
In the separate circuit cooling system (oil cooler and aftercooler circuit), the left side water pump (14) pulls coolant from the heat exchanger through the inlet (13). Coolant from the left side water pump goes to the oil cooler bonnet (15). Coolant flow is divided at the oil cooler bonnet. Part of the coolant is sent to the oil coolers (9) while the rest of the coolant is sent to the aftercoolers (4). After the coolant flows through the aftercoolers and the oil coolers, the coolant returns to the heat exchanger through the mixer housing (2) and the coolant outlet (3).There is a makeup line from the expansion tank to the coolant inlet (13). This line helps keep the coolant in the circuit (oil cooler and aftercooler) at the correct level.A vent line is required between the top of the engine oil cooler's housing and the expansion tank. The vent line is installed by the customer. This is for the circuit (aftercooler and oil cooler).Jacket Water Cooling Circuit
The right side water pump (11) pulls coolant from the expansion tank through the coolant inlet (12). Coolant from the right side water pump flows to the side of the cylinder block through the elbows (10) and (16).The coolant flows upward through the water jacket. The coolant flows around the cylinder liners from the bottom to the top. Near the top of the cylinder liners, the water jacket is made smaller. This is the area that has the hottest temperature. This shelf (smaller area) causes the coolant to flow faster for better liner cooling. Coolant from the top of the liners flows into the cylinder head which sends the coolant around the parts that have the hottest temperature. The coolant flows to the top of the cylinder head (one at each cylinder). The coolant flows out of the cylinder head through an elbow into the water manifolds (8). The coolant then flows through the manifold to the mixer housing (2). The coolant exits the mixer housing through the outlet and flows through a remote mounted water temperature regulator and the heat exchanger. The coolant then flows back to the expansion tank.Coolant is sent from the water jacket at the rear of the cylinder block throughtubes (7) to the turbocharger (6). Coolant from the turbocharger is returned to the cylinder block throughthe tubes (5). A vent line is required between the top of the turbocharger and the expansion tank. The vent line is installed by the customer. This is for the jacket water system.