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#1
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Antifreeze leak and boat leak
Two minor prods with the 1987 Sea Ray. It has a 3.7 liter mercruiser I/O
engine with a closed coolant system. So I have a antifreeze tank, overflow tank, and a big cylinder on the side that antifreeze and water runs through. To keep the antifreeze in the overflow tank between the add and full lines I usually have to add in one to three cups of coolant into it each time I take the boat out. I can start the boat up and turn it on and off and run it for a while in the yard and the coolant amount stays the same and no smoke comes out the back. When I take it out on the lake and I turn it off in the water and let it sit there for any amount of time more than a minute or so, and then start it up a bunch of whitish smoke comes out of the back appearing to come from the exhaust. It smells like exhaust with a hint of antifreeze. This is where I am losing the coolant, but I dont know where its leaking at. Oil is not milky and this problem has stayed consistant for the whole summer so far. The second problem that may or may not be related to the first problem is that I have a leak in hte boat. The leak is down at the bottom of where the outboard peice comes through the transom. The leak is not big enough to make the bilge pump run for for a little bit every once in a while, but water is definitly coming in. To get to whatever is leaking the outboard peice is going to have to come off. How much to places usually charge for such a task? Thanks for any info you got! Cameron |
#2
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Antifreeze leak and boat leak
"Ree-Yees" wrote in message news Two minor prods with the 1987 Sea Ray. It has a 3.7 liter mercruiser I/O engine with a closed coolant system. So I have a antifreeze tank, overflow tank, and a big cylinder on the side that antifreeze and water runs through. To keep the antifreeze in the overflow tank between the add and full lines I usually have to add in one to three cups of coolant into it each time I take the boat out. I can start the boat up and turn it on and off and run it for a while in the yard and the coolant amount stays the same and no smoke comes out the back. When I take it out on the lake and I turn it off in the water and let it sit there for any amount of time more than a minute or so, and then start it up a bunch of whitish smoke comes out of the back appearing to come from the exhaust. It smells like exhaust with a hint of antifreeze. This is where I am losing the coolant, but I dont know where its leaking at. Oil is not milky and this problem has stayed consistant for the whole summer so far. The second problem that may or may not be related to the first problem is that I have a leak in hte boat. The leak is down at the bottom of where the outboard peice comes through the transom. The leak is not big enough to make the bilge pump run for for a little bit every once in a while, but water is definitly coming in. To get to whatever is leaking the outboard peice is going to have to come off. How much to places usually charge for such a task? Thanks for any info you got! Cameron White smoke out the exhaust and a loss of coolant points towards a blown head gasket. Water coming in at the transom, looks like a bad bellows. |
#3
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Antifreeze leak and boat leak
"Ree-Yees" wrote in message . ..
Two minor prods with the 1987 Sea Ray. It has a 3.7 liter mercruiser I/O engine with a closed coolant system. So I have a antifreeze tank, overflow tank, and a big cylinder on the side that antifreeze and water runs through. To keep the antifreeze in the overflow tank between the add and full lines I usually have to add in one to three cups of coolant into it each time I take the boat out. I can start the boat up and turn it on and off and run it for a while in the yard and the coolant amount stays the same and no smoke comes out the back. When I take it out on the lake and I turn it off in the water and let it sit there for any amount of time more than a minute or so, and then start it up a bunch of whitish smoke comes out of the back appearing to come from the exhaust. It smells like exhaust with a hint of antifreeze. This is where I am losing the coolant, but I dont know where its leaking at. Oil is not milky and this problem has stayed consistant for the whole summer so far. The second problem that may or may not be related to the first problem is that I have a leak in hte boat. The leak is down at the bottom of where the outboard peice comes through the transom. The leak is not big enough to make the bilge pump run for for a little bit every once in a while, but water is definitly coming in. To get to whatever is leaking the outboard peice is going to have to come off. How much to places usually charge for such a task? Thanks for any info you got! Cameron Sounds like a cracked head. When the motor is cool or lighly loaded - no leak. Once its loaded and heated the head contorts slightly and the crack opens, letting small amounts of water into the cylinder. You can try a coolant system pressure test, but if its cool it may not happen. You can warm it up first - With the radiator cap OFF!! and try a pressure test. I had the same problem on my old I/O, but it was intermittent. Finally had the motor torn down and the mech showed me the head cracked near a valve seat. Thats the bad news. The good nes is that if you have to pull the motor anyway you're going to have to pull the outdrive and you can fix that other leak. Good Luck FishFan |
#4
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Antifreeze leak and boat leak
Oh, I meant to say that when you fire it up in the water it will only smoke
for 5-10 seconds, smelling like antifreeze, and then it is gone. If you go out on the lake for 3 hours and never turn the boat off it never smokes and never loses antifreeze. I dont know if that makes a difference or not? How much about to fix a cracked head gasket? I feared that this could be the case, but I thought normally if you had a cracked head gasket a little water would make its way into the oil and it would turn milky? Also, can I just keep adding a little coolant forever? Problem doesnt seem to be getting any better or worse. Getting the leak fixed at the same time would be a plus I guess. I need new shift cables installed anyways ($200) so maybe I can get it all done at the same time. How do I do the pressure test? If I take the radiator cap off wouldnt the coolant just come up out of the top? Also if it was letting water into the cylinder how woudl this explain it smelling like antifreeze and loozing some antifreeze? Thanks for the info! --Cameron Sounds like a cracked head. When the motor is cool or lighly loaded - no leak. Once its loaded and heated the head contorts slightly and the crack opens, letting small amounts of water into the cylinder. You can try a coolant system pressure test, but if its cool it may not happen. You can warm it up first - With the radiator cap OFF!! and try a pressure test. I had the same problem on my old I/O, but it was intermittent. Finally had the motor torn down and the mech showed me the head cracked near a valve seat. Thats the bad news. The good nes is that if you have to pull the motor anyway you're going to have to pull the outdrive and you can fix that other leak. Good Luck FishFan |
#5
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Antifreeze leak and boat leak
It also seems like I could recreate the leak with the smoke in the driveway
if it was a head gasket. Could it be some kidn of exhaust manifold leak if it was water cooled? I dont know if mine is, but I'll try to checkand see tonight. --C "Ree-Yees" wrote in message ... Oh, I meant to say that when you fire it up in the water it will only smoke for 5-10 seconds, smelling like antifreeze, and then it is gone. If you go out on the lake for 3 hours and never turn the boat off it never smokes and never loses antifreeze. I dont know if that makes a difference or not? How much about to fix a cracked head gasket? I feared that this could be the case, but I thought normally if you had a cracked head gasket a little water would make its way into the oil and it would turn milky? Also, can I just keep adding a little coolant forever? Problem doesnt seem to be getting any better or worse. Getting the leak fixed at the same time would be a plus I guess. I need new shift cables installed anyways ($200) so maybe I can get it all done at the same time. How do I do the pressure test? If I take the radiator cap off wouldnt the coolant just come up out of the top? Also if it was letting water into the cylinder how woudl this explain it smelling like antifreeze and loozing some antifreeze? Thanks for the info! --Cameron Sounds like a cracked head. When the motor is cool or lighly loaded - no leak. Once its loaded and heated the head contorts slightly and the crack opens, letting small amounts of water into the cylinder. You can try a coolant system pressure test, but if its cool it may not happen. You can warm it up first - With the radiator cap OFF!! and try a pressure test. I had the same problem on my old I/O, but it was intermittent. Finally had the motor torn down and the mech showed me the head cracked near a valve seat. Thats the bad news. The good nes is that if you have to pull the motor anyway you're going to have to pull the outdrive and you can fix that other leak. Good Luck FishFan |
#6
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Antifreeze leak and boat leak
How does one test the heat exchanger to see if Im leaking a little out of
that? "Ree-Yees" wrote in message .. . It also seems like I could recreate the leak with the smoke in the driveway if it was a head gasket. Could it be some kidn of exhaust manifold leak if it was water cooled? I dont know if mine is, but I'll try to checkand see tonight. --C "Ree-Yees" wrote in message ... Oh, I meant to say that when you fire it up in the water it will only smoke for 5-10 seconds, smelling like antifreeze, and then it is gone. If you go out on the lake for 3 hours and never turn the boat off it never smokes and never loses antifreeze. I dont know if that makes a difference or not? How much about to fix a cracked head gasket? I feared that this could be the case, but I thought normally if you had a cracked head gasket a little water would make its way into the oil and it would turn milky? Also, can I just keep adding a little coolant forever? Problem doesnt seem to be getting any better or worse. Getting the leak fixed at the same time would be a plus I guess. I need new shift cables installed anyways ($200) so maybe I can get it all done at the same time. How do I do the pressure test? If I take the radiator cap off wouldnt the coolant just come up out of the top? Also if it was letting water into the cylinder how woudl this explain it smelling like antifreeze and loozing some antifreeze? Thanks for the info! --Cameron Sounds like a cracked head. When the motor is cool or lighly loaded - no leak. Once its loaded and heated the head contorts slightly and the crack opens, letting small amounts of water into the cylinder. You can try a coolant system pressure test, but if its cool it may not happen. You can warm it up first - With the radiator cap OFF!! and try a pressure test. I had the same problem on my old I/O, but it was intermittent. Finally had the motor torn down and the mech showed me the head cracked near a valve seat. Thats the bad news. The good nes is that if you have to pull the motor anyway you're going to have to pull the outdrive and you can fix that other leak. Good Luck FishFan |
#7
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Antifreeze leak and boat leak
I have twin 3.7's and what you describe is a common problem for these. The
leak in normally between the manifold and reservoir. It usually means that you have to replace the reservoir and the gasket. If you pull the #4 plug you will probably see that the piston in that cylinder looks very clean on top. That is because that is the first cylinder it leaks into. Mine broke the piston in half before I paid attention to it. You might want to check it a little sooner to save LOTS of money. Terry "Ree-Yees" wrote in message news Two minor prods with the 1987 Sea Ray. It has a 3.7 liter mercruiser I/O engine with a closed coolant system. So I have a antifreeze tank, overflow tank, and a big cylinder on the side that antifreeze and water runs through. To keep the antifreeze in the overflow tank between the add and full lines I usually have to add in one to three cups of coolant into it each time I take the boat out. I can start the boat up and turn it on and off and run it for a while in the yard and the coolant amount stays the same and no smoke comes out the back. When I take it out on the lake and I turn it off in the water and let it sit there for any amount of time more than a minute or so, and then start it up a bunch of whitish smoke comes out of the back appearing to come from the exhaust. It smells like exhaust with a hint of antifreeze. This is where I am losing the coolant, but I dont know where its leaking at. Oil is not milky and this problem has stayed consistant for the whole summer so far. The second problem that may or may not be related to the first problem is that I have a leak in hte boat. The leak is down at the bottom of where the outboard peice comes through the transom. The leak is not big enough to make the bilge pump run for for a little bit every once in a while, but water is definitly coming in. To get to whatever is leaking the outboard peice is going to have to come off. How much to places usually charge for such a task? Thanks for any info you got! Cameron |
#8
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Antifreeze leak and boat leak
Your leak "at the bottom" of the outdrive may be a rotten transom......
Bill "Terry Rago" wrote in message news:MJlJc.82343$%_6.81673@attbi_s01... I have twin 3.7's and what you describe is a common problem for these. The leak in normally between the manifold and reservoir. It usually means that you have to replace the reservoir and the gasket. If you pull the #4 plug you will probably see that the piston in that cylinder looks very clean on top. That is because that is the first cylinder it leaks into. Mine broke the piston in half before I paid attention to it. You might want to check it a little sooner to save LOTS of money. Terry "Ree-Yees" wrote in message news Two minor prods with the 1987 Sea Ray. It has a 3.7 liter mercruiser I/O engine with a closed coolant system. So I have a antifreeze tank, overflow tank, and a big cylinder on the side that antifreeze and water runs through. To keep the antifreeze in the overflow tank between the add and full lines I usually have to add in one to three cups of coolant into it each time I take the boat out. I can start the boat up and turn it on and off and run it for a while in the yard and the coolant amount stays the same and no smoke comes out the back. When I take it out on the lake and I turn it off in the water and let it sit there for any amount of time more than a minute or so, and then start it up a bunch of whitish smoke comes out of the back appearing to come from the exhaust. It smells like exhaust with a hint of antifreeze. This is where I am losing the coolant, but I dont know where its leaking at. Oil is not milky and this problem has stayed consistant for the whole summer so far. The second problem that may or may not be related to the first problem is that I have a leak in hte boat. The leak is down at the bottom of where the outboard peice comes through the transom. The leak is not big enough to make the bilge pump run for for a little bit every once in a while, but water is definitly coming in. To get to whatever is leaking the outboard peice is going to have to come off. How much to places usually charge for such a task? Thanks for any info you got! Cameron |
#9
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Antifreeze leak and boat leak
Bill Sheffield wrote:
Your leak "at the bottom" of the outdrive may be a rotten transom...... (snip) OR a leaky boot. Rotten transom - sheesh!!! |
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