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Maintenance
Refill Engine C
oolant Loop
Refill the engine coolant loop when the coolant is
below the cold level line at ambient temperature.
To avoid burns, do not perform maintenance on
the coolant system until the coolant system has
reached ambient temperature.
Only use coolant solutions that are compatible with
the system. See Coolant Specifications, page 72.
NOTICE
Do not refill with drained coolant. Use only fresh,
new coolant to avoid contaminants.
NOTICE
Do not use any “stop leak” additives to prevent
plugged filters and small orifices.
NOTICE
Do not interchange the two caps between the
radiator and coolant bottle. The caps have different
pressure ratings that affect the overflow.
1. Perform Shutdown, page 63.
2. Remove the engine radiator coolant cap
(RC) and fill until the coolant reaches the
bottom of the neck. Replace cap. See
Coolant Specifications, page 72.
3. Remove the cap from the engine coolant loop
bottle (EB) and fill until the coolant is at the hot
level. Replace cap.
4. Press start button
twice on the engine
control module.
5. Turn main power switch ON.
6. Inspect coolant loops for leaking fittings or valves.
7. The coolant has reached operating temperature
when the radiator fan turns on. When the fan
turns on, turn the main power switch OFF.
8. Press to stop the generator.
9. Add more coolant to expansion bottle (EB)
after the coolant system temperature lowers to
ambient temperature. Repeat until coolant level
stays at cold level when at ambient temperature.
It may take a few cycles to remove all air out of
coolant system.
Coolant Specifications
NOTICE
Do not refill with straightwaterortapwater.
Changing the 50% mix ratio use of tap water will
allow fittings to rust.
Only refill the coolant loops with a solution of 50%
distilled or soft water and 50% green ethylene glycol
antifreeze with a corrosion inhibitor. Do not use
common tap water; it contains chlorides and minerals
which form scale on the coolant system walls. Do not
use any stop leak products. The additives in these
products will clog the heat exchanger and fluid valves,
decreasing system performance. Use only antifreeze
that meets specification ASTM D3306–89, BS658, or
AS 2108. A pre-diluted mix is recommended, such
as PEAK Ready Use 50/50 Pre-Diluted.
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