New to me 2006 Caravelle 187 LS , ran well first day on the water, but kept running on dieseling, read everything on here about that, put in premium gas before heading out for 4 days, still was running on "dieseling", read the part about rpm and at idle in gear it was around 900, adjusted the screw until it was 650 stopped dieseling, and was fixed
next day hit the water and the temp alarm went off as it reached 200 F, scratched my head as it cooled off, ran rest of the day no problem but seemed higher 180 ish the rest of the day than the usual 165, start out the next day and it does it again, as I'm looking at it while it cools off I notice the one hose clamp on the large intake hose on left side is totally loose, probably allowing air in or at least less water flow to the pump, I tighten it and all is perfect the rest of the day and its running back at 165-170.
next day exact opposite, the engine warms up and reaches 165 but as soon as you start cruising it gradually swings down to 100, than still while cruising it gradually climbs back to 165, then it swings back down to 100, did this for a good hour or so....only explanation I have is that the thermostat is sticking open, but wondering if anyone has any other thoughts, Im pretty sure the sensors and gauges are good, as the gauge and buzzer are two different sensors and they were corroborating each other
when I winterized it last fall right after buying it, the engine block wouldn't drain without poking wires in the holes and fishing some debris out, so I would also be interested in a procedure for giving the engine a good flush, I never once had a blockage when draining the block on my 95 4.3, so have a feeling this boat was ran in a cruddy lake
next day hit the water and the temp alarm went off as it reached 200 F, scratched my head as it cooled off, ran rest of the day no problem but seemed higher 180 ish the rest of the day than the usual 165, start out the next day and it does it again, as I'm looking at it while it cools off I notice the one hose clamp on the large intake hose on left side is totally loose, probably allowing air in or at least less water flow to the pump, I tighten it and all is perfect the rest of the day and its running back at 165-170.
next day exact opposite, the engine warms up and reaches 165 but as soon as you start cruising it gradually swings down to 100, than still while cruising it gradually climbs back to 165, then it swings back down to 100, did this for a good hour or so....only explanation I have is that the thermostat is sticking open, but wondering if anyone has any other thoughts, Im pretty sure the sensors and gauges are good, as the gauge and buzzer are two different sensors and they were corroborating each other
when I winterized it last fall right after buying it, the engine block wouldn't drain without poking wires in the holes and fishing some debris out, so I would also be interested in a procedure for giving the engine a good flush, I never once had a blockage when draining the block on my 95 4.3, so have a feeling this boat was ran in a cruddy lake
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