88 regal , twin 350, alpha one Gen one, raw water cooled
I bought an 88 280 Regal commodore back in Oct that is moored (have owned trailered boats for 15 years and am a mechanic). About two month after the starboard engine began to overheat at idle but anything over 1k RPM would drop down to running tem. Two weeks later the Port side started to do the same?. will overheat at idle but temp would drop with any RPM increase. I took both T housings off, replaced thermostats (142 degree) and checked for blockage but both are fine.
For test purposes I hooked up a known good temp sender and gauge, both engines came to a (idle) running temp of 190 but dropped down to 150-ish once the rpm was brought above 1,000 rpm.
I assumed impeller so I called my local Marina to schedule a haul out. After explaining the situation the mechanic doesn?t seem to think its an impeller issue but something else?.like a blockage.
Im up for ideas and suggestions?at the same time I want to throw this out there. My marina was recently rebuilt, meaning lots of new wood with lots of saw dust in the water? could this be the issue?
I bought an 88 280 Regal commodore back in Oct that is moored (have owned trailered boats for 15 years and am a mechanic). About two month after the starboard engine began to overheat at idle but anything over 1k RPM would drop down to running tem. Two weeks later the Port side started to do the same?. will overheat at idle but temp would drop with any RPM increase. I took both T housings off, replaced thermostats (142 degree) and checked for blockage but both are fine.
For test purposes I hooked up a known good temp sender and gauge, both engines came to a (idle) running temp of 190 but dropped down to 150-ish once the rpm was brought above 1,000 rpm.
I assumed impeller so I called my local Marina to schedule a haul out. After explaining the situation the mechanic doesn?t seem to think its an impeller issue but something else?.like a blockage.
Im up for ideas and suggestions?at the same time I want to throw this out there. My marina was recently rebuilt, meaning lots of new wood with lots of saw dust in the water? could this be the issue?
