A week or so back I posted this-
http://forums.iboats.com/showthread.php?t=196975
I have since used a fiberoptic bore scope to peek up the water tube from water pump to powerhead, found it clear- then looked up the exhaust tube, again clear, and in the thermostat hole, and cylinders. NO signs of water intrusion.
I used a solution called Trac Buster, a biodegradeable solution that eats scale and growth- with the lower unit removed (water pump was good too) I plugged the water tube, I removed the thermostat cover and thermostat, and filled the powerhead with this stuff, figuring I had nothing to loose and perhaps a piece of impeller or something was lodged in a coolant passage possibly restricted by salt growth and crud in the passages (this was a salt water used engine prior to my getting it)
It sizzled and bubbled like crazy! Now the aluminum when you look in the thermostat port is clear as new aluminum. I reassembled everything but left out the 'stat (what did I have to loose?) and by eyeball it flows a LOT more water on the flusher.
Took the boat out- as soon as you advance into gear, "BEEP BEEP BEEP!" but the engine is NOT running hot, using an infared heat gun while another person drives the boat and I have the cowling off I got 176* at the base of the temp alarm sensor with 75* river water. As far as oil pressure? Well I did not have a gauge on it, but I theorize if I had that low of oil pressure I would have slug a rod out the side of the thing by now.
Unhooking the wire from the temp switch does not stop the alarm, nor does unhooking the oil switch wire.
NOW- after a lot of start, stop, operation from idle to WOT up and down current, the alarm finally started the steady tone, and "de rated" or hit the rev limiter to power it down.
I will get out my service manual, but am now firmly in belief there is not a powerhead problem or an over heat. I have some sort of electrical ghost.
What do the Iboats gurus have to offer?
Eric in Savannah
http://forums.iboats.com/showthread.php?t=196975
I have since used a fiberoptic bore scope to peek up the water tube from water pump to powerhead, found it clear- then looked up the exhaust tube, again clear, and in the thermostat hole, and cylinders. NO signs of water intrusion.
I used a solution called Trac Buster, a biodegradeable solution that eats scale and growth- with the lower unit removed (water pump was good too) I plugged the water tube, I removed the thermostat cover and thermostat, and filled the powerhead with this stuff, figuring I had nothing to loose and perhaps a piece of impeller or something was lodged in a coolant passage possibly restricted by salt growth and crud in the passages (this was a salt water used engine prior to my getting it)
It sizzled and bubbled like crazy! Now the aluminum when you look in the thermostat port is clear as new aluminum. I reassembled everything but left out the 'stat (what did I have to loose?) and by eyeball it flows a LOT more water on the flusher.
Took the boat out- as soon as you advance into gear, "BEEP BEEP BEEP!" but the engine is NOT running hot, using an infared heat gun while another person drives the boat and I have the cowling off I got 176* at the base of the temp alarm sensor with 75* river water. As far as oil pressure? Well I did not have a gauge on it, but I theorize if I had that low of oil pressure I would have slug a rod out the side of the thing by now.
Unhooking the wire from the temp switch does not stop the alarm, nor does unhooking the oil switch wire.
NOW- after a lot of start, stop, operation from idle to WOT up and down current, the alarm finally started the steady tone, and "de rated" or hit the rev limiter to power it down.
I will get out my service manual, but am now firmly in belief there is not a powerhead problem or an over heat. I have some sort of electrical ghost.
What do the Iboats gurus have to offer?
Eric in Savannah
