1979 SeaRay 21' cuddy w/250 Mercrusier (350 Chevy) w/A-1 I/O
Boat starts, runs fine. Temp normal at idle (700-750 RPMs) - stays normal until RPMs exceed 1200. After 10 minutes temp slowly climbs to red, reduce to idle and temp comes back down to normal after a few minutes.
Replaced impeller and impeller body, new 140 degree thermostat and cover. Hoses are OK with no pinch or collapse at higher RPM. Going to pull the water pump next.
Comments?
Boat starts, runs fine. Temp normal at idle (700-750 RPMs) - stays normal until RPMs exceed 1200. After 10 minutes temp slowly climbs to red, reduce to idle and temp comes back down to normal after a few minutes.
Replaced impeller and impeller body, new 140 degree thermostat and cover. Hoses are OK with no pinch or collapse at higher RPM. Going to pull the water pump next.
Comments?
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