Operation and Maintenance Manual for WP2.1C/WP3.9C Series Marine Diesel
14
The fuel feed pump is of single-acting and plunger type. It is mounted on one side
of the injection pump and driven by a cam on the camshaft of the pump. A primer
pump is attached on the feed pump to bleed air from the fuel pipeline before starting
the engine. When it is not in use, lock the primer pump handle by pressing and turning
the nut on the top of it to prevent leakage of fuel.
Fuel should be kept absolutely clean to ensure a long service life of the parts in
the fuel supply system. Replace the cartridge with a new one if it is clogged.
The fuel injection pump is the BQ or PL series injection pumps. The injection
pump has been adjusted and sealed in the factory. It should not be readjusted by
customers except when absolutely necessary. All the service operations should be
carried out by qualified servicemen on an injection pump tester according to the
instructions in the service manual of the injection pump.
The TQA type governor is a centrifugal and variable-speed governor. The
maximum speed setting screw is used to set the maximum speed of the engine and the
idle speed setting screw is for low idle setting. The speed setting screws have been
properly adjusted in the factory and are not allowed to be readjusted by customers.
The P type injector has a nozzle with 5 holes of dia.0.22mm. It is mounted with
one clamping plate and one tightening bolt. The injector nozzle tip protrusion is
3.3±0.1mm.
Special shims are used for adjusting the protrusion. The nozzle needle and valve
seat are finely matched to each other and should not be interchanged. Keep the
injector parts absolutely clean during maintenance operation.
3.6 Lubricating System
The lubricating system consists of the oil pump, oil pump strainer, oil filter and
oil pipeline.
The lubrication of the engine is of the splash-and-pressure combined type. Some
bearings such as the main bearing, connecting rod bearing, camshaft bearing and
rocker arm bearing are pressure-lubricated, while other friction surface such as the
cylinder liner, piston, piston pin, valves and gears are lubricated by splashed oil.
The lubricating oil drawn by the oil pump flows into the oil filter. Filtered oil
flows through the main oil gallery in the cylinder block to lubricate the crankshaft
main bearings, camshaft bushings and rocker arm bushings, and oil through the oil
hole from the crankshaft journal to the crank pin to lubricate the connecting rod
bearing.
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