Page 60 - CARILEC CE Industry Journal_Oct_2019

When the Phased Vibration trace (Fig.26) is included, it
is now very clear that the fuel injection occurs around
TDC which is ~12 degrees later than it should for this
engine type. As can be seen, it is opening as indicated by
the vibration impact at essentially TDC position. The first
area to focus on is the fuel delivery system (Injector,
Rocker Arm, etc.)

Fig. 26 - Phased Vibration and Pressure Time Curve

With the above guidance, the maintenance personnel
performed a targeted physical engine examination and
identified the cause of the bad cylinder performance as
shown in Figure 27.

Fig. 27 - Broken Component from rocker assembly

After repair, the pressure value returned to normal as did
the Pressure trace and Vibration trace, as indicated in
Figure 28 below.

58 CE INDUSTRY Journal