TP-5594 5/953-10 Scheduled Maintenance
Cooling System
WARNING
Hot coolant and steam.
Can cause severe injury or death.
Before removing pressure cap, stop generator set
and allow it to cool. Then loosen pressure cap to
relieve pressure.
Hot coolant can cause severe injury or death. Allow
engine to cool and release pressure from cooling
system before opening pressure cap. To release
pressure,coverthepressurecapwithathickcloth;then
slowlyturnitcounterclockwisetothe first stop. Remove
cap after pressure has been completely released and
the engine has cooled. Check coolant level at tank if
generator set is equipped with a coolant recovery tank.
To prevent the inconvenience of having the generator
set shut down or become damaged due to overheating,
keep the cooling air inlets clean and unobstructed at all
times. Inspect the exterior of the radiator for
obstructions; remove all dirt and foreign material with a
soft brush or cloth (to avoid damaging radiator fins).
Check all hoses and connections for leaks and replace
any hoses that are cracked, frayed, or feel spongy.
Whencoolantlevelchecksaremade,checkconditionof
the radiator cap rubber seal; replace if cracked or
deteriorating. Remove dirt and other debris from the
radiator cap and filler neck.
Coolant capacity for the 7 kW inline-radiator model is
2.44 qts. (2.3L). The 10 kWinline-radiator model hasa
coolant capacity of 5.1 qts. (4.8 L). Consult the coach
manufacturer for remote radiator cooling system
capacity. Drain petcocks are provided on the bottom
tank of the radiator and another in the engine block to
drain the system. When draining the coolant, remove
the radiator cap and open the block drain located near
the flywheel housing; this will allow the entire system to
drain and prevent air pockets from forming and
restricting coolant passage in the block. To refill the
cooling system, close the drain petcock and fill the
radiator to the proper level with the recommended
coolant mixture. See Figure 3-10 and Figure 3-11 for
coolantfillanddrainlocations. Replacetheradiatorcap
and operate the engine until the thermostat opens and
the radiator upper hose becomes hot. Stop the engine
and allow to cool. Add coolant to the radiator to just
below the overflow tube on the filler neck. Replace the
radiator cap.
A coolant solution of 50% ethylene glycol and 50%
clean, softened water is required to inhibit corrosion,
prevent freezing to --34_F (--37_C), and to improve
cooling. Use antifreeze that contains a rust inhibitor.
Change coolant everytwo years. Do notuse alcoholor
methanol antifreeze or mix them with the coolant. Do
not add coolant to an engine that has overheated until
the engine has cooled. Adding coolant to an extremely
hot engine can cause a cracked block or cylinder head.
Check coolant level frequently and add antifreeze
solution as needed to maintain level just below the
overflow tube and at the min. level in the coolant
recovery tank when cold (max. when hot).
NOTE
Pay special attention when checking for proper coolant
level. After a radiator has been drained, some time is
normally required before completerefill ofall aircavities
take place.
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