Typical Cooling System Maintenance Schedules*
* Check owners manual for engine-specific information, including maximum engine-hours between service.
|
OPEN-COOLED GAS |
CLOSE-COOLED |
CLOSE-COOLED DIESEL |
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.
