Onan MGKBC Series, Руководство по установке

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8
RAW WATER PICKUP TEST
Objective
The objective is to determine the elevation of the
water line relative to the genset under all anticipated
uses and speeds of the boat.
Method
When the boat is ready for its sea trials and loaded
to its maximum rated capacity:
1. Close the sea cock and disconnect the raw wa-
ter pickup hose from the genset (Figure 1). Al-
ternatively, connect a clear plastic hose to the
strainer or sea cock.
2. Raise the end of the hose above expected wa-
ter level and open the sea cock. The water line
is at the level visible in a clear plastic hose or
where water just begins to spill as the end of the
hose is lowered. While the boat is still docked,
mark the level on the genset enclosure.
3. Operate the boat through its speed range, for-
ward and reverse. While the boat is operating,
have someone monitor the water level in the
hose and mark the highest level on the genset.
Requirement
A siphon break must be installed if the engine ex-
haust-water mixer (Page 23) is not at least 6 inches
(152 mm) above both water lines (docked and mov-
ing).
Note: If the water line when the boat is moving is
much higher than when the boat is docked, the differ-
ence could be due to the through-hull fitting or its
location. If the through-hull fitting is of the forward-
facing scoop-type designed to create ram pressure,
replace it with a flush-type fitting. Another possibility
might be to move the fitting to a location where the
dynamic hull pressure is less.
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