PUMP GP-LUBRICATION 2113336 - Caterpillar

Water pump inlet pipe (13) is connected to the expansion tank outlet. Coolant from the pump (12) flows through the piping to oil cooler (11). On D399 Engines, a portion of the coolant from the piping is directed into cylinder block (10). The flow from the oil cooler is to flywheel housing (9).
FLOW OF COOLANT (SCHEMATIC)
1-Aftercooler. 2-Elbow. 3-Exhaust manifold. 4-Cylinder head. 5-Bypass line. 6-Temperature regulator housing. 7-Expansion tank. 87ndash;Marine gear oil cooler. 9-Flywheel housing. 10-Cylinder block. 11-Oil cooler. 12-Water pump. 14-Inlet pipe. 14-Raw water pump. 15-Heat exchanger.The flywheel housing has two separate passages. The upper passage directs the flow of coolant to the junction housing, at the left side of the flywheel housing. From the upper connection of the junction housing, when equipped with a fresh water aftercooler, part of the flow is directed through the pipe to the front core of the aftercooler (1). The crossover pipe, on the right side of the aftercooler, directs the flow through the rear core. Coolant then flows through the pipe connected to the lower connection of the junction housing where it joins with the bypassed coolant from the flywheel housing upper passage. On engines equipped with a raw water cooled aftercooler, all coolant turns 180° at the left side of the flywheel housing and flows back across the housing through the lower passage. See the topic RAW WATER SYSTEM.Coolant flows back across the flywheel housing through the lower passage where the flow is divided, an equal part going to each bank of cylinders of the cylinder block.On engines equipped with attachments that have heat exchanger-type oil coolers such as a marine gear oil cooler (8). which requires fresh water, an adapter is attached to the left side of the flywheel housing. Part of the coolant flows through the cooler and is then directed back to the lower passage of the flywheel housing and then directed to the cylinder banks on each side of the cylinder block (10).The coolant then circulates around the cylinder block, around the cylinder liners and upward through the cylinder heads (4).The coolant flows from the cylinder heads, through elbows (2) to the exhaust manifold shields (3). The coolant circulates through the exhaust manifold shield and forward to the temperature regulator housings (6) at the front of each exhaust manifold.
FLOW OF COOLANT (D399 Illustrated)
1-Aftercooler. 2-Elbow. 3-Exhaust manifold shields. 4-Cylinder head. 6-Temperature regulator housing. 7-Expansion tank. 9-Flywheel housing. 10-Cylinder block. 11-Oil cooler. 12-Water pump. 13-Inlet pipe.Regulators, positioned in each regulator housing, control the flow of coolant to the heat exchanger (15) to regulate the temperature of the engine coolant. The regulator housings are connected by a crossover tube. The coolant flows through the heat exchanger to the expansion tank (7). The inlet pipe (13) of the water pump is connected to the expansion tank.A bypass line (5) extends from the inlet side of the temperature regulator housing to the inlet side of the water pump. When the temperature of the coolant is not high enough to open the