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1. Test Run Tank and Test Propeller
Test Run Tank Requirements and Precautions For Use
q Partition (required when testing two engines
in one tank)
w Ventilation duct
e Water level
r Transom board
• The figure to the right shows the minimum
dimensions required for the test run tank.
• The dimensions shown in the figure are the
minimum that must be provided for a single
engine, whether it be in a tank partitioned for
two engines.
Test Propeller
Out to diameter: 198 mm
Out width: 20 mm
Blade width: 40 mm
Precautions for Operation
• Continuous operation will raise the temperature of water in the tank, potentially causing the engine to
seize up, so it is important to maintain water temperature in the 25°C (77°F) range. It is also
recommended that cooling and overflow systems be installed.
• Over periods of continued use the tank water gradually becomes contaminated by the waste discharged
from the engine. This waste, which eventually coats the interior of the engine's cooling system, will
reduce the engine's cooling capability, so it is important to change tank water on a regular basis.
• Over periods of continued use, engine exhaust fumes will accumulate in the vicinity of the engine.
Engine performance is affected as the engine takes in air with increasing levels of these gases from the
the throttle body, so it is important to install mechanical ventilation system to maintain an exhaust gas-
free environment around the engine.
• The water in the tank will tend to splash and spray out unless a sufficiently high of water is maintained in
the tank.
q
26 cm
Approx. 20 cm gap
Engine speed at full throttle (rpm)
10-2
20 cm or more
w e
10 cm
r
q
75°
140 cm or more
Approx. 5,000
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Troubleshooting
