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Sorry for the long opening, but I've done quite a bit already, and I'm really confused.
Ran motor all last season with no issues. The motor has never been in salt water. The motor was not used for about 2 months before I winterized it. When I winterized in the fall, just as I was ready to shut it down, the overheat siren came on. Hoping it was a fluke, I put it away anyway. I started it again on earmuffs yesterday. The overheat problem wasn't a fluke.
Here's what I've checked so far:
1) Motor always pees good.
2) Checked thermostats in pan of water. They both open at approx 122 degrees like they are supposed to.
3) Pulled lower unit and checked impeller. Everything looks fine.
4) I drilled a hole through one of my kids bouncy balls and stuck that on the end of my air hose. Stuck the ball/air hose on one thermostat opening, covered the other with the palm of my hand, and had my son make sure there was good air flow coming out the tube in the lower unit. He said yes, so it seems there was no obstruction there. Repeated the test by holding air hose on other thermostat opening and still good air flow.
5) Started motor on earmuffs for about a minute with no thermostats and no thermostat covers, just to see if water was filling the block. No water made it to the top of the motor.
6) Pulled Poppet/PRV pressure relief valve. It seemed like it may have possibly been stuck in the closed position. However, from what I've been reading, it should be closed at low RPM anyway. Cleaned it up a little and don't see any reason it wouldn't be working properly now.
7) Hooked a hose up to the hose connector on the port side of the motor and tried flushing the motor. I had the poppet valve out, and both thermostats out. Water did come into the opening where the poppet valve goes, but didn't seem to have much pressure even though the hose was on full force. I stuck my finger in the PRV hole to plug it, still no water to the top of the motor on either side.
I'm really confused.
I think the water flow is supposed to:
1) Come in water inlets in lower unit to feed water pump
2) Water pump pushes water up the tube to the bottom of the motor where the poppet valve is.
3) If there's too much pressure, some is released from the poppet valve.
4) Water is pushed into water jackets surrounding the cylinders to the top of the motor.
5) Thermostats hold water and keep it from flowing out of the water jackets into the heads until proper temp is reached.
6) Thermostats open and allow water to flow through the heads and back down through the bottom of the motor into the lower unit.
I'm pretty sure water is supposed to get mixed in with the exhaust, but there seems to be very little coming out the center of the prop and none coming out of the ports in the upper lower unit.
Based on what I think I know, I would think the water pump isn't generating enough pressure or there is a blockage between the water pump and the pressure relief valve location. However, if that were the case, I'd think I'd get water to the top of the motor when I hooked it up to the hose connection on the port side of the motor.
Please help!
Ran motor all last season with no issues. The motor has never been in salt water. The motor was not used for about 2 months before I winterized it. When I winterized in the fall, just as I was ready to shut it down, the overheat siren came on. Hoping it was a fluke, I put it away anyway. I started it again on earmuffs yesterday. The overheat problem wasn't a fluke.
Here's what I've checked so far:
1) Motor always pees good.
2) Checked thermostats in pan of water. They both open at approx 122 degrees like they are supposed to.
3) Pulled lower unit and checked impeller. Everything looks fine.
4) I drilled a hole through one of my kids bouncy balls and stuck that on the end of my air hose. Stuck the ball/air hose on one thermostat opening, covered the other with the palm of my hand, and had my son make sure there was good air flow coming out the tube in the lower unit. He said yes, so it seems there was no obstruction there. Repeated the test by holding air hose on other thermostat opening and still good air flow.
5) Started motor on earmuffs for about a minute with no thermostats and no thermostat covers, just to see if water was filling the block. No water made it to the top of the motor.
6) Pulled Poppet/PRV pressure relief valve. It seemed like it may have possibly been stuck in the closed position. However, from what I've been reading, it should be closed at low RPM anyway. Cleaned it up a little and don't see any reason it wouldn't be working properly now.
7) Hooked a hose up to the hose connector on the port side of the motor and tried flushing the motor. I had the poppet valve out, and both thermostats out. Water did come into the opening where the poppet valve goes, but didn't seem to have much pressure even though the hose was on full force. I stuck my finger in the PRV hole to plug it, still no water to the top of the motor on either side.
I'm really confused.
I think the water flow is supposed to:
1) Come in water inlets in lower unit to feed water pump
2) Water pump pushes water up the tube to the bottom of the motor where the poppet valve is.
3) If there's too much pressure, some is released from the poppet valve.
4) Water is pushed into water jackets surrounding the cylinders to the top of the motor.
5) Thermostats hold water and keep it from flowing out of the water jackets into the heads until proper temp is reached.
6) Thermostats open and allow water to flow through the heads and back down through the bottom of the motor into the lower unit.
I'm pretty sure water is supposed to get mixed in with the exhaust, but there seems to be very little coming out the center of the prop and none coming out of the ports in the upper lower unit.
Based on what I think I know, I would think the water pump isn't generating enough pressure or there is a blockage between the water pump and the pressure relief valve location. However, if that were the case, I'd think I'd get water to the top of the motor when I hooked it up to the hose connection on the port side of the motor.
Please help!
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