3.3 For an engine with an internal circulation cooling water system (with circulation
pump and temperature control valve, refer to Figure 8-3), and when the liner wall
temperature is between 60°C and 90°C (for example when the engine is pre-
heated or after engine full stop for a sufficient period), release the unwanted air
with a high flow rate as follows:
Fig 8-3 Cooling water system with circulation
Legend
001 Temperature control valve 02 Connection 02 (cylinder liner cooling water
inlet)
002 Circulation pump 05 Connection 05 (cylinder cooling water drain
outlet)
003 Shut-off valve
3.3.1 Close the shut-off valves (003) in the cylinder liner supply pipes of the
first half of cylinders (for example cylinder 1 to 6 for a 12 cylinder
engine).
NOTE: This increases the pressure and thus the flow rate to the other
cylinders.
3.3.2 Let the cooling water flow through the other cylinder liners for
approximately ten minutes.
3.3.3 Open the shut-off valves (003) in the cylinder liner supply pipes of the
first half of cylinders.
3.3.4 Do Step 3.3.1 to Step 3.3.3 again for the second half of cylinders (for
example cylinder 7 to 12 for a 12 cylinder engine).
3.4 Set all valves to their correct positions for operation.
3.5 Release the unwanted air in the cooling water pipes and the scavenge air
coolers at the related vent valves.
3.5.1 Carefully open the first vent valve.
3.5.2 After water that has no air flows out, close the vent valve.
3.5.3 Do Step 3.5.1 and Step 3.5.2 again with the other vent valves.
3.6 Make sure that the values that follow are in the permitted range:
•
Pressure in the supply pipe of the cylinder cooling water
•
Temperature in the supply pipe of the cylinder cooling water
•
Pressure in the cooling water supply pipe of the scavenge air cooler
(SAC)
•
Temperature in the cooling water supply pipe of the SAC.
X92DF
AA00-0000-00AAA-121A-A
Operation Manual Prepare the engine before start
Winterthur Gas & Diesel Ltd.
- 434 - Issue 002 2020-08
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