I was told by the surveyor when I bought Mambo last month that the raw water hose from the seacock to the raw water strainer has some small cuts in it and should be replaced. Looks fairly easy (4 hose clamps and a 2 foot hose). The surveyor mentioned that the hose was nothing special and could be replaced with something from a hardware store. After thinking about removing the hose I was wondering if I should worry about water draining from the raw water system. I expect some water to drain from the hose, but will I have much more coming out of the cooling jacket? I am also concerned that I will introduce air into this system that I won't know how to bleed. Any thoughts about whether these will be problems I'll encounter or will it be simply removing the old hose, catch some water as it drains from the hose and replace it with a new hose? Thanks, Carl
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Lee Hadjiosif
Use marine hose
Carl, The hose replacement should just be simply removing the old hose, catch some water as it drains from the hose and replace it with a new hose just like you said. However, the hose is not just one you can buy at the local hardware store. It should be a marine hose rated for "below waterline" service with metal coil reinforcing. You can buy this at any marine store. It's not worth saving a couple of dollars and risk sinking the boat.
Carl, The hose replacement should just be simply removing the old hose, catch some water as it drains from the hose and replace it with a new hose just like you said. However, the hose is not just one you can buy at the local hardware store. It should be a marine hose rated for "below waterline" service with metal coil reinforcing. You can buy this at any marine store. It's not worth saving a couple of dollars and risk sinking the boat.
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jay
no problem
As long as your intake sea cock is closed, the water you get when you break into the system will be fairly minimal and on most boats has a clear path to the bilge. The resulting air in the system isn't a problem, the sea suction fills up with water as soon as you open the sea cock and when the pup spins it fills the rest of the system, pushing out the air. I'd buy a high quality hose for the job, heavy duty industrial from a plumbing supply or if you don't know how to select, get some from BoatUS, West Marine, etc. that isn't their bottom grade hose. For the extra cents per foot it may be worth not having to float your boat off the bottom should the seacock get left open and the hose fail.
As long as your intake sea cock is closed, the water you get when you break into the system will be fairly minimal and on most boats has a clear path to the bilge. The resulting air in the system isn't a problem, the sea suction fills up with water as soon as you open the sea cock and when the pup spins it fills the rest of the system, pushing out the air. I'd buy a high quality hose for the job, heavy duty industrial from a plumbing supply or if you don't know how to select, get some from BoatUS, West Marine, etc. that isn't their bottom grade hose. For the extra cents per foot it may be worth not having to float your boat off the bottom should the seacock get left open and the hose fail.
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Carl Nencetti
Responses much appreciated
Thanks for the input. I feel much better about doing this little repair now. And I agree that the extra few dollars for the right hose is money well spent. Good advice from the forum, bad advice from the surveyor. Thanks again. C
Thanks for the input. I feel much better about doing this little repair now. And I agree that the extra few dollars for the right hose is money well spent. Good advice from the forum, bad advice from the surveyor. Thanks again. C
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joe phibbs
amen!
A previous owner of our 1986 Hunter 31 replaced the raw water intake hose with one from an auto supply house and caused us much grief. The hose appeared fine, except that we had an intermittent overheating problem that we could not replicate: it just happened sometimes. FINALLY, we discovered that the unr-reinforced hose actually collapsed with the suction of the water pump, thus restricting cooling seawater into the engine and causing Yanmar 2GM20F to overheat. All is better now. joe
A previous owner of our 1986 Hunter 31 replaced the raw water intake hose with one from an auto supply house and caused us much grief. The hose appeared fine, except that we had an intermittent overheating problem that we could not replicate: it just happened sometimes. FINALLY, we discovered that the unr-reinforced hose actually collapsed with the suction of the water pump, thus restricting cooling seawater into the engine and causing Yanmar 2GM20F to overheat. All is better now. joe
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Brian
use wire reinforced hose
I would recommend using wire reinforced hose. It is actually required on most, if not all boats. It is not a high pressure hose, but the simple fact that if the hose fails, and the seacock is left open, you can sink your boat is reason enough not to skimp. You should NEVER take the cheap way out below the waterline. Unless of course, you get a really good deal on the good stuff! You don't have to worry about bleeding air from your raw water system. At least I don't. You may want to check with a mechanic if you have heard otherwise. But raw water does it's cooling, (either to the heat exchanger or the engine block) and goes out with the exhaust. The fuel supply is where you need to bleed air from. You simply close the seacock, remove the old hose, and install the new hose. If you are concerned about salt water leaking back out when you remove the hose, just dump some fresh water on the areas the got wet are rinse it to the bilge. I don't have a fresh water cooling system on my boat, my raw water goes straight through the engine and out the exhaust. When I know the boat is going to sit for more than a week, I close the seacock, disconnect the hose from the engine, and use a spare peice of hose to flush the motor with fresh water from a bucket. I just stick the hose in the bucket, restart the motor and run it until the bucket is empty. Then I reconnect the raw water hose and leave the seacock closed until I run the motor again. My engine zincs were still 99% in tact after one year of doing this. My point for all of this is that replacing the raw water intake hose on most motors (and again, check with a mechanic if you have heard differently) is a simple task.
I would recommend using wire reinforced hose. It is actually required on most, if not all boats. It is not a high pressure hose, but the simple fact that if the hose fails, and the seacock is left open, you can sink your boat is reason enough not to skimp. You should NEVER take the cheap way out below the waterline. Unless of course, you get a really good deal on the good stuff! You don't have to worry about bleeding air from your raw water system. At least I don't. You may want to check with a mechanic if you have heard otherwise. But raw water does it's cooling, (either to the heat exchanger or the engine block) and goes out with the exhaust. The fuel supply is where you need to bleed air from. You simply close the seacock, remove the old hose, and install the new hose. If you are concerned about salt water leaking back out when you remove the hose, just dump some fresh water on the areas the got wet are rinse it to the bilge. I don't have a fresh water cooling system on my boat, my raw water goes straight through the engine and out the exhaust. When I know the boat is going to sit for more than a week, I close the seacock, disconnect the hose from the engine, and use a spare peice of hose to flush the motor with fresh water from a bucket. I just stick the hose in the bucket, restart the motor and run it until the bucket is empty. Then I reconnect the raw water hose and leave the seacock closed until I run the motor again. My engine zincs were still 99% in tact after one year of doing this. My point for all of this is that replacing the raw water intake hose on most motors (and again, check with a mechanic if you have heard differently) is a simple task.
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Mike H
that surveyor worries me
That surveyor advice raises ones eyebrows as to whether or not that guy is in the right profession. I hope for your sake that nothing major was missed during the survey. That hose comment leaves me unimpressed by Mr Surveyor.
That surveyor advice raises ones eyebrows as to whether or not that guy is in the right profession. I hope for your sake that nothing major was missed during the survey. That hose comment leaves me unimpressed by Mr Surveyor.
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Stirling Hasen
That surveyor is going to sink boats, report him!
Hi Mike, Was that surveyor accredited by any of the reputable surveying associations? If he is you might want to relay that advice you were instructed on to them. Some of these associations include: National Association of Marine Surveyors - www.namsurveyors.org US Surveyors Association - www.navsurvey.com among others. Please do all of us a favor and help get this guy some proper training on best practices for below the water line connections!
Hi Mike, Was that surveyor accredited by any of the reputable surveying associations? If he is you might want to relay that advice you were instructed on to them. Some of these associations include: National Association of Marine Surveyors - www.namsurveyors.org US Surveyors Association - www.navsurvey.com among others. Please do all of us a favor and help get this guy some proper training on best practices for below the water line connections!
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Brad
Survey
Stirling you left out The Society of Accredited Marine Surveyors, the largest and most education oriented association. USSA is a joke.
Stirling you left out The Society of Accredited Marine Surveyors, the largest and most education oriented association. USSA is a joke.
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Carl Nencetti
Repair done, survey did not note deficiency
Went to the local boat repair facility and bought 15" of hose for $9 and installed it without incident. Checked the written survey and found the raw water cooling system hose comment was "adequate". Althought the hose has several small cuts it was not enough to be written as a deficiency. With only a verbal comment that the hose could be replaced with "any" hose I'm not comfortable reporting the surveyor to anyone. I guess we are all lucky to have forums like these with pople who we would never had been able to contact 10 years ago for info like this. Thanks again people. Carl
Went to the local boat repair facility and bought 15" of hose for $9 and installed it without incident. Checked the written survey and found the raw water cooling system hose comment was "adequate". Althought the hose has several small cuts it was not enough to be written as a deficiency. With only a verbal comment that the hose could be replaced with "any" hose I'm not comfortable reporting the surveyor to anyone. I guess we are all lucky to have forums like these with pople who we would never had been able to contact 10 years ago for info like this. Thanks again people. Carl
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