Service Manual for WP6 Diesel Engine
80
(6) Remove the hollow bolts that connecting fuel injection pump and lubricating pipe.
(7) Remove engine front cover upper plate, refer to disassembly of engine front cover for details.
(8) Screw off injection pump camshaft nuts, remove injection pump gear.
(9) Remove fixing nuts between injection pump and engine front cover, take down the pump.
3723 Inspection and Maintenance of Fuel Injection Pump
(1) Check fuel pump appearance for crack and oil leakage; if so, replace the pump or feedback the
problem to the manufacturer.
(2) Check whether the lead seal on injection pump is damaged; if so, replace the pump or readjust
fuel supply rate.
(3) Check whether there is crack on smoke limiter air pipe, whether there is air leakage in pipe
joints, the pipe should be replaced if there is crack, and replace the bolt gaskets if there is air
leakage.
(4) Check lubricating pipe for oil leakage; if so, replace the pipe or bolt gaskets.
3724 Steps to Assemble Fuel Injection Pump
Assembling steps are contrary to disassembling ones. But note that when assembling fuel injection
pump gear, the mark on fuel injection pump gear should be aligned to the one on engine front cover.
Before tightening the fixing nuts between injection pump and engine front cover, it is required to
rotate the flywheel to set the engine in correct fuel supply advance angle, and then tighten the nuts.
373 Disassembly, Inspection, Maintenance and Assembly of High Pressure
Fuel Pipe
3731 Exploded View of High Pressure Fuel Pipe
Refer to Fig. 3-46 Exploded view of fuel injection pump.
3732 Steps to Disassemble High Pressure Fuel Pipe
(1) Remove intake and exhaust pipe module, refer to disassembly of intake and exhaust pipe for
details.
(2) Remove the high pressure fuel pipe fixing cylinder cover and the fixed support on engine
block.
(3) Remove connecting nuts between high pressure fuel pipe and each injector successively.
(4) Remove connecting nuts between high pressure fuel pipe and each injection pump successively.
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