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Important Service Notice
Any time an engine experiences a high coolant temperature alarm condition the primary cause of the overheat
must be determined and the cause corrected to prevent a recurring overheat event.. Additionally, if an event of
a restricted flow, collapsed hose, insufficient coolant level or failed pressure cap is experienced, further
investigation of the cooling system is required.
- The coolant should be drained (after de-energizing the coolant heater
- Replace the engine thermostat(s)
- Remove the engine water pump and inspect the impeller and seal for damage, replace as necessary.
Reassemble and refill coolant according to the Installation and Operations Instruction Manual.
- Run the engine to verify normal operating temperature.
Cavitation
Cavitation is a condition that occurs when bubbles form in the coolant flow in the low pressure areas of the cooling
system and implode as they pass to the higher pressure areas of the system. This can result in damage to cooling
system components, particularly the water pump impeller and cylinder liners. Cavitation in an engine can be caused by:
• Improper coolant
• Restricted coolant flow caused by collapsed hose or plugged system
• Coolant fill cap is loose or unable to retain the required pressure
• Insufficient fluid level
• Failure to de-aerate
• Overheat
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