Operation Manual

Section:
Page:
Engine:
Operating the Engine
4
4-4-01
S/BVM 628
© 0185
4.5 Taking Combustion Indicator Diagrams
Be sure closely to observe the instructions issued by the indicator manufacturer, or readings
are liable to be incorrect.
The instrument recommended by us is the Mahaik torsionspring indicator, type S, plunger 1/2,
with the following springs:
Max. combustion pressure Spring
100 bar F 100 bar No. 50
120 bar F 120 bar No. 60
140 bar F 140 bar No. 70
160 bar F 160 bar No. 80
Pressures see acceptance records.
Taking Indicator Diagrams
Thoroughly blow through the indicator valves to prevent any carbon particles entering the gauge.
Then screw indicator firmly in its place.
Put indicator paper on the recording drum and draw the zero line.
Open indicator valve and slowly turn drum from recording the combustion pressures
For recording the compression pressure, cut out injection pump (Job Card 07.01.01) and check
that control rod of the injection pump does not abut at its load limit.
The following data should be entered upon the diagram:
Date, spring scale, cylinder No., corresponding exhaust temperature, control rod position, speed
and charge air pressure.
Assessing the Readings
Compare readings with the values given in the Acceptance Record.