Cummins 4BT – CAV DPA/DPS Fuel Injection Pump Timing

Correct timing of the Lucas CAV DPA/DPS fuel injection pump can be verified by removing the inspection plate.
NOTE: Special equipment in an authorized shop is required to precisely time the Lucas CAV DPA fuel injection pump.
However, for troubleshooting and in an emergency, visual alignment of the timing mark is close enough for the engine
to run.
Both of these checks are described in the fuel injection pump replacement discussion. Installation of the timing
pin housing is described in the Base Engine Components Section.