EDGE-CUTTING 7T9978 - Caterpillar

This system includes a single section pump, and V-bottom pan. A prelube oil pump system on standard D399 and G399 engines is driven by a 115/230 V AC motor. Air and 32V DC driven prelube systems are available as attachments. The main lubrication system will be discussed first, then the prelube oil pump systems.Main Lubrication System
Under normal operating conditions oil flow is as follows: lubricant from the oil pan base (17) is pumped through oil cooler (7), filter housings (8) and to oil distribution manifold (6).A pressure regulating valve (14) mounted on the oil pan base controls the maximum pressure of oil from pump (16).Oil filter bypass valves in each filter housing, bypass oil to the oil manifold when the flow is momentarily restricted because of cold oil. When the oil is warm, only filtered oil is furnished to the engine bearings. If the oil filter elements become restricted, the bypass valves open and the oil flows directly to the oil distribution manifold.The oil distribution manifold directs oil through connecting passages to the engine internal and external components, timing gears and front accessory drive.External Component Lubrication
The turbocharger, governor, governor booster pump (4), fuel injection pump housing and the governor and fuel pump drive shaft receive lubricant from the fuel pump and governor drive housing oil manifold (3). When equipped with an oil pressure shutoff it is also supplied with lubricating oil from this manifold. Drain back oil from these components returns to the oil pan base.
In this D399 Engine schematic, pressure oil flow is shown in dark grey and suction oil, drain back oil or splash lubricated points are shown in light grey. 1-Turbocharger oil return line. 2-Turbocharger oil supply line. 3-Fuel pump and governor drive housing oil manifold. 4-Governor booster oil pump. 5-Valve rocker mechanism. 6-Oil distribution manifold. 7-Oil cooler. 8-Two filter housings. 9-Camshaft bearings. 10-Crankshaft main bearings. 11-Crankshaft connecting rod bearings. 12-Oil spray orifices. 13-Prelube system pump. 14-Pressure regulating valve. 15-Suction bell. 16-Single section oil pump. 17-Oil pan base.Internal Components
The oil distribution manifold (6) directs filtered lubricant through passages and tubes to: piston oil spray orifices (12), valve rocker mechanism (5), camshaft bearings (9), crankshaft bearings (10), connecting rod bearings (11), fuel pump and governor drive housing oil manifold (3).Timing Gears
Oil under pressure flows to the camshaft thrust bearing. The gears receive lubrication from drain back oil from the turbocharger, camshaft and crankshaft rear bearings.Front Accessory Drive
The oil distribution manifold (1), delivers oil through a drilled passage to the front main bearing, and from this passage to the front accessory drive. Steel tubes in the front accessory drive housing supply oil to the bearings which support the idler gears (7) and (8), water pump gear (2), oil pump gear (3), main idler gear (4) and on D379 Engine the balancer gear (5).
In this schematic pressure oil flow to the accessory drive gear bearings is shown in grey. 1-Oil distribution manifold. 2-Water pump gear. 3-Oil pump gear. 4-Main idler gear. 5-Balancer gear. 6-Crankshaft gear. 7-Idler gear. 8-Idler