Typical Cooling System Maintenance Schedules*

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* Check owners manual for engine-specific information, including maximum engine-hours between service.

 

OPEN-COOLED GAS
(FRESH WATER)

CLOSE-COOLED
GAS (SALT WATER)

CLOSE-COOLED DIESEL
(SALT WATER)

Rubber Raw-Water Impeller

Every year; two at most

Every year; two at most

Every year; two at most

Bronze Raw-Water Impeller

n/a

n/a

At overhaul or if leaking

Raw-Water Pump Rebuild

At overhaul or if leaking

At overhaul or if leaking

At overhaul or if leaking

Circulating Pump

Every few years or if leaking

At overhaul or if leaking

At overhaul or if leaking

Heat Exchanger

n/a

Every three years

Every two years**

Thermostat

Every few years or if sticking

At overhaul

At overhaul

Oil Cooler

Check for obstructions or leaks at springtime launch

When heat exchanger is cleaned

When heat exchanger is cleaned

Transmission Oil Cooler

Check for obstructions or leaks at springtime launch

When heat exchanger is cleaned

When heat exchanger is cleaned

Antifreeze-Cooled Charge-Air Cooler

n/a

n/a

Every two years or 2,000 hours

Raw-Water-Cooled Charge-Air Cooler

n/a

n/a

Every two years or 2,000 hours

Engine Zincs

Check every Spring—more often for boats kept on shore power

Check every 30 days and replace when 50% eroded

Check every 30 days and replace when 50% eroded

Belts

Every year; two at most

Every year; two at most

Every year; two at most

** With new lightweight aluminum heat-exchanger and charge-air cooler housings, timely maintenance is key to longevity.

Return to "How to Maintain Your Boat's Cooling-System"

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