wc_tx002068gb.fm
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Onan Genset Genset Maintenance
9.7 Changing Engine Coolant
Requirements
Genset shut down and cool
50/50 mixture of ethylene glycol and water
Collection container, 2-liter (1/2-gal)
Funnel
Background
The genset is filled with a 50/50 mixture of ethylene glycol and water at the factory.
This formula is suitable for temperatures as low as -37°C (-34°F).
Use the best quality ethylene glycol solution available; one that is formulated with
rust inhibitors and coolant stabilizers. Use distilled water, or fresh water that
contains small amounts of minerals or corrosive chemicals.
NOTICE: Replace the pressure cap (x) every two years. The pressure cap
provides proper cooling system pressure which is essential for best engine cooling.
Note: In the interests of environmental protection, place a plastic sheet and a
container under the machine to collect any liquid which drains off. Dispose of this
liquid in accordance with local environmental protection laws.
Draining
Perform the procedure below to drain the coolant.
1. Disconnect the battery.
2. Remove the access cover. The fill hose assembly (a) is connected to the access
cover. Disconnect the fill hose from the access cover.
3. Pull the fill hose assembly out of the generator as far as it will go.
4. Relieve any remaining pressure by turning the pressure cap (x) slowly without
pushing down. Then, remove the pressure cap by turning and pushing down.
This procedure continues on the next page.
WARNING
Burn hazard. Hot coolant spray can cause severe burns.
f Allow the engine to cool before changing the coolant.
wc_gr008040
a
x
y
z
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