Engine Radiator Maintenance
DAILY:
COOLANT LEVEL
Check the engine radiator coolant level and add coolant if necessary. A solution of 50%
ethylene glycol by volume is the recommended yearround coolant. Replenish the corrosion
inhibitor according to engine manufacturer’s recommendation.
In warm climates a coolant based on water with corrosion inhibitors is approved for use.
Water only systems need to be treated with the proper dosage of corrosion inhibitors.
Inadequate concentration of the coolant additive can result in major corrosive
damage to cooling system components. Over concentration can cause formation
of “gel” that can cause restriction, plugging of coolant passages, and overheating.
MONTHLY:
RADIATOR EXTERIOR
Clean any foreign matter from the radiator cooling fins and through-core cooling passages
by directing compressed air and flushing water over the entire area of the core in the
reverse direction of normal air flow.
QUARTERLY
CORROSION INHIBITOR FILTER
Replenish the cooling system corrosion inhibitor filter every 250hours of operation.
Never use a chromate base corrosion inhibitor when the coolant contains
ethylene glycol. Use only non-chromate base inhibitors. Chromate base inhibitors
reacting with ethylene glycol can produce chromium hydroxide, commonly
known as “green slime”. This substance reduces the heat transfer rate and can
cause serious engine overheating.
SEMI ANNUALLY
COOLING SYSTEM
Clean the cooling system every 2,000 hours or 2 years whichever comes first. Use a
radiator cleaning compound, following the instructions on the container. Flush the system
thoroughly and refill with an ethylene glycol solution of 50% by volume.
Refer to the topic, “Corrosion Inhibitor,” above, when cleaning the cooling system and be
certain the inhibitor used is compatible with the coolant.
T300-1_T500-1_T780
Maintenance
336 P/N 12261-683
REVISED: January 2015
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