Chapter 3 OPERATION
3-7
Checking Valves for Open/Closed
Position
Make sure the following valves, plugs and cocks
are open or closed properly.
• Fuel feed valve: Open
• Coolant drain cock (coolant tank): Closed
• Coolant drain cock (engine): Closed
• Coolant drain cock (water pump): Closed
• Oil drain valve: Closed
• Air supply valve (air tank): Open
Test Operation
To conduct a test operation, follow the procedures below.
Note: Refer to "Normal Engine Operation" (3-8) to operate the engine.
1 To circulate engine oil throughout the engine, pull the manual stop lever fully to the STOP position and hold
it in that position to keep the fuel injection pump in no-injection condition, then supply starting air and crank
the engine for about 10 seconds.
Then, wait for about one minute, and repeat the above process twice to fully circulate engine oil.
2 Start the engine.
3 Operate the engine under no load and at low idling speed for 10 minutes.
4 Stop the engine.
Leave the engine for about 30 minutes. While waiting, check the engine exterior for leakage of fuel, engine
oil, coolant and exhaust gas.
After 30 minutes, check the engine oil level and coolant level. If they are low, add engine oil or coolant to
the specified level.
5 Operate the engine under no load and at low idling speed for 5 minutes.
6 Operate the engine under no load and at rated speed for 5 minutes.
7 Operate the engine under 25% rated load and at rated speed for 30 minutes. (In the case of a main marine
engine, apply load according to a cube curve.)
8 Operate the engine under 50% rated load and at rated speed for 30 minutes. (In the case of a main marine
engine, apply load according to a cube curve.)
9 Operate the engine under 70% rated load and at rated speed for 30 minutes. (In the case of a main marine
engine, apply load according to a cube curve.)
10 Operate the engine under 100% rated load and at rated speed for 60 minutes. (In the case of a main
marine engine, apply load according to a cube curve.)
11 Stop the engine.
fig.3-15 Checking valves for open/closed position
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