Page 65 - CARILEC CE Industry Journal_Oct_2019

Case Study #4-Lose Fuel Injector Adjustment Lock-Nut As indicated in the report below (Fig. 34), cylinder 11
has the lowest peak firing pressure, the earliest peak
This engine is a two-stroke EMD 645-16 cylinder engine pressure angle and the highest exhaust temperature. If
in nuclear emergency diesel generator service. In this only Exhaust temperatures were monitored there would
example the engine was being tested after a maintenance be no compelling evidence, there was an issue as the
activity per plant procedures.

Fig. 34 - Engine Report

In the two following plots (Figs 35 and 36) the first being clearly that the injector does not “Pop” at the expected
the High Frequency Vibration signature and the second time and is extremely late.
one the Ultrasonic Frequency signature, it can be seen

Fig. 35 - High Frequency Vibration Fig. 36 - Ultrasonic Frequency Vibration

The Exhaust Temperature bar graph for the right bank
is normal as shown in Figure 37.

Fig. 37 - Exhaust Temperatures
CE INDUSTRY Journal 63