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| The most common cause of low power in the Cummins PT system is air entering the fuel system. The injection pump can be a contributing factor in this area. In most instances the drive shaft seal area has worn excessively and the seals can no longer seal. This requires replacement of both the seals and shaft. It is recommended that the pump be completely resealed if any seal begins to fail, this prevents other seals from failing soon after the first repair. Another cause of low power is improper boost pressure to the aneriod. Most late style ('77 and newer) pumps have an Air Fuel Control (AFC) which allows turbo boost to open a fuel valve increasing fuel deliver as boost rises. This prevents smoke during acceleration. If improper boost is being fed to the AFC this will result in low fuel delivery and low power. This can be caused by a bad turbo, a faulty line connecting the pump to the intake, or faulty bellows in the injection pump. Low power can also result when
a mistake is made while changing parts on a Cummins engine. Most
Cummins engine components will interchange (e.g. Turbo, Pump,
Injectors). The proper combination must be determined by getting
the engines Control Parts List (CPL) number. This is located on
the engine nameplate. Just putting a 400HP pump on a 300HP engine
will not necessarily result in the horsepower increase. When changing
an engines horsepower, be sure and determine a CPL number before
hand and change all the components accordingly.
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