Diesel Engine Troubleshooting

PF Rack Setting

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Engines equipped with individual PF pumps usually have their fuel racks (control rods) interconnected by adjustable mechanical linkage to permit balancing the fuel flow to each nozzle and the combustion chamber.

Some larger engines employ a micrometer-type knurled knob adjusting screw that the technician can rotate manually to obtain very fine adjustment of fuel delivery. On large, slow-speed engines, fuel delivery and cylinder balance are best achieved by monitoring the individual cylinder exhaust temperatures by looking at the pyrometer gauge(s) and adjusting the individual fuel rack adjustment knobs.

Written by Ed

September 3rd, 2011 at 8:54 am

Posted in Bosch Fuel Systems

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