Maintenance
Refill Engine Coolant Loop
Refill the engine coolant loop when the coolantis
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 thatare 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
radiatorand coolant bottle. Thecaps 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 ofthe neck. Replace cap. See
Coolant Specifications, page 72.
3. Remove the cap from the enginecoolant loop
bottle (EB) and fill until the coolantis at the hot
level. Replace cap.
4. Press start button twice on the engine
control module.
5. Turn main power switch ON.
6. Inspectcoolant loops for leaking fittings or valves.
7. The coolant has reachedoperating 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 lowersto
ambient temperature. Repeat until coolant level
stays at cold level when at ambient temperature.
It may take a few cycles to remove all airout of
coolant system.
Coolant Specifications
NOTICE
Do not refill with straightwaterortapwater.
Changing the 50% mix ratio use oftap water will
allow fittings to rust.
Only refill the coolant loops with a solutionof 50%
distilled or soft water and 50% green ethylene glycol
antifreeze with a corrosion inhibitor. Do not u se
common tap water; itcontains chlorides and minerals
which form scale on the coolant system walls. Do not
use any stop leak products. The additives in these
productswill clog the heat exchanger and fluid valves,
decreasing system performance. Use only antifreeze
that meets specificationASTM 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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