have an issue where this boat has readings on new manifolds and riser of over 180 degrees,
back story ,the boat was overheating terribly and the previous owner had another mechanic run tests where he pulled the thermostat and "allegedly" pulled the risers for inspection. which he said were fine. i stepped in after that point., running the boat found that there was no water coming out of the transom when running on muffs the boat went into overheat, raising the idle speed caused the hose to blow off of the elbow from the water distribution housing, when the hose blew off, the temp went back to normal. further inspection found the manifolds and risers terribly corroded with rust.. (original from 2004) now fast forward to now, i replaced the manifolds and risers, and all seamed well, until i was called and informed the boat temp did not raise above 100 degrees. tests with infrared heat gun found the entire system did not go above 100 degrees including the manifolds. i found that the thermostat was removed and not in the system( which the PO said was replaced) and installed the correct one. after that this issue has arrised.
the PO had the seapump impeller replaced when the overheat started happening. once i got involved, the boat was out of the water
anyways, i replaced the manifolds/risers and ran the boat on muffs and it cooled nicely and the water flowed out the exhaust. i did notice the temp was not climbing but i felt the reason was because it was on muffs and the water coming from the house was very cold and pressured. it wasnt until the boat was in the water and we saw the temp still didnt go up that i found the thermostat was missing.
do you think the impeller can be bad even though the engine temp is staying within range?
the hose routing looks to be correct.
i think based on all the other inacurate information i have been fed, it may be possible this impeller was not changed as the said it was
i just don;t see why the engine will be within range if the impeller is bad and how does the engine stay @165 when the manifolds are climing to close to 200 degrees.
this boat is one issue after another, after the thermostat was installed one of the hose clamps going to the lower manifold fitting broke and caused the bilge to fill with water up to the middle of the water circulator pump pulley. this because the bilge pump screen was clogged and stopped the pump from disposing of the water. i immediatly pumped out the bilge and found that the p/s pump took on water. further inspection found the the exhust tubes both melted holes in them and the shutters were gone. on the port side of the engine. i replaced all these parts and found the manifolds were getting extremely hot. so now i need to figure out why this is heating up so much yet keeping the engine temp within range.i am puliing the boat tomorrow to remove the drive and inspect the bellows for water due to this issue.
back story ,the boat was overheating terribly and the previous owner had another mechanic run tests where he pulled the thermostat and "allegedly" pulled the risers for inspection. which he said were fine. i stepped in after that point., running the boat found that there was no water coming out of the transom when running on muffs the boat went into overheat, raising the idle speed caused the hose to blow off of the elbow from the water distribution housing, when the hose blew off, the temp went back to normal. further inspection found the manifolds and risers terribly corroded with rust.. (original from 2004) now fast forward to now, i replaced the manifolds and risers, and all seamed well, until i was called and informed the boat temp did not raise above 100 degrees. tests with infrared heat gun found the entire system did not go above 100 degrees including the manifolds. i found that the thermostat was removed and not in the system( which the PO said was replaced) and installed the correct one. after that this issue has arrised.
the PO had the seapump impeller replaced when the overheat started happening. once i got involved, the boat was out of the water
anyways, i replaced the manifolds/risers and ran the boat on muffs and it cooled nicely and the water flowed out the exhaust. i did notice the temp was not climbing but i felt the reason was because it was on muffs and the water coming from the house was very cold and pressured. it wasnt until the boat was in the water and we saw the temp still didnt go up that i found the thermostat was missing.
do you think the impeller can be bad even though the engine temp is staying within range?
the hose routing looks to be correct.
i think based on all the other inacurate information i have been fed, it may be possible this impeller was not changed as the said it was
i just don;t see why the engine will be within range if the impeller is bad and how does the engine stay @165 when the manifolds are climing to close to 200 degrees.
this boat is one issue after another, after the thermostat was installed one of the hose clamps going to the lower manifold fitting broke and caused the bilge to fill with water up to the middle of the water circulator pump pulley. this because the bilge pump screen was clogged and stopped the pump from disposing of the water. i immediatly pumped out the bilge and found that the p/s pump took on water. further inspection found the the exhust tubes both melted holes in them and the shutters were gone. on the port side of the engine. i replaced all these parts and found the manifolds were getting extremely hot. so now i need to figure out why this is heating up so much yet keeping the engine temp within range.i am puliing the boat tomorrow to remove the drive and inspect the bellows for water due to this issue.
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