
DIESEL FUEL INJECTION SYSTEMS 157
Plunger
^—clearance
gauge
SAAAAA
Figure 8.15 Plunger stroke measuring tool used in phasing
operation
2 The use of a graduated degree plate that can be set to
zero on the test bench, so that the commencement of
injection for no. 1 pumping element will serve as a
datum for all the others, in order of cylinder injection
sequence. The phase angle or angular difference
between each commencement of injection reading
should be 60° for a six-cylinder engine or, of course,
equal increments of 360° depending upon whatever
other number of cylinders is involved. Phase angles
normally have to be held within the limits o ...