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#1
posted to rec.boats
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overheating
I have a thing for driving ancient vehicles, I like to think it is the
ultimate male thing of futiley fighting entropy, other people just think I'm cheap. So, I drive either a 1988 Dodge Ramcharger or a 1986 Nissan. The Nissan has been out of it for awhile so I drive the Ramcharger. Fri night, my son borrowed it for a date. he calls about 12:30 am saying it is steaming and smelling awful. I sleepily tell him to park it at her house and have her give him a ride home and fell asleep. After all, either he has ruined the engine or he hasnt, in either case it isnt a financial disaster. Sat Morn, he is home and the Ramcharger is in the driveway and he told me he drove it home (about 5 miles) steaming. I didnt even get mad, just told him that you cannot treat an old vehicle that way. Somehow this kid who is very computer savvy has no concept how mechanical things work and doesnt like getting his hands dirty. OK, so we decide to go sailing. Get to the coast in my wifes Toyota Highlander, get aboard my 1981 S2 with 13 hp Yanmar diesel and start motoring out the channel. get almost all the way out when the engine alarm comes on indicating overheating. Damn, even if we put up the sail we cannot sail against the wind down the channel. I check for water flow out the exhaust and cannot really tell, although I think that when it flows well I can tell. So, I allow it to cool for a few minutes till the wind pushes us nearly out of the channel and then start the engine and motor a little ways, allow her to cool, motor again etc till I am nearly back. Finally, for no apparent reason, she suddenly starts to work again with no alarm with definite water flow. back at the dock, I run her at high rpm for 15 minutes to see if she will do it again and nothing happens. My working theory about the diesel overheating is that there may be an air bubble in the raw water cooling (it is a heat exchanger type with raw water cooling the fresh water/antifreeze via a heat exchanger). I have changed the impeller and was very careful to follow the diagram to get the vanes pointing the right way last year. I think the air bubble impedes the flow until it finally gets enough flow to overcome it. Thoughts? The Dodge, I simply took to Advance auto and got a bottle of Bars Leak and put it in, I plan to buy a radiator online. The replacement radiators seem to be plastic and without taking the old one out I cannot tell if it is plastic, anybody know? If the old one is metal, I'd rather get it soldered. Anybody know? My radiator in my 1986 Nissan is plastic so the 1988 Dodge may also be. Anybody know? I actually got my Nissan running again, we all thought it had a bad in- tank fuel pump. Weird electrical problems nmade me suspicious of this diagnosis so I went over all the ground connections and replaced the battery, battery terminals and battery cables, dang if she doesnt run again. |
#2
posted to rec.boats
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overheating
On Sep 21, 2:28*pm, wrote:
I have a thing for driving ancient vehicles, I like to think it is the ultimate male thing of futiley fighting entropy, other people just think I'm cheap. *So, I drive either a 1988 Dodge Ramcharger or a 1986 Nissan. *The Nissan has been out of it for awhile so I drive the Ramcharger. *Fri night, my son borrowed it for a date. *he calls about 12:30 am saying it is steaming and smelling awful. *I sleepily tell him to park it at her house and have her give him a ride home and fell asleep. *After all, either he has ruined the engine or he hasnt, in either case it isnt a financial disaster. Sat Morn, he is home and the Ramcharger is in the driveway and he told me he drove it home (about 5 miles) steaming. *I didnt even get mad, just told him that you cannot treat an old vehicle that way. *Somehow this kid who is very computer savvy has no concept how mechanical things work and doesnt like getting his hands dirty. OK, so we decide to go sailing. *Get to the coast in my wifes Toyota Highlander, get aboard my 1981 S2 with 13 hp Yanmar diesel and start motoring out the channel. *get almost all the way out when the engine alarm comes on indicating overheating. *Damn, even if we put up the sail we cannot sail against the wind down the channel. *I check for water flow out the exhaust and cannot really tell, although I think that when it flows well I can tell. *So, I allow it to cool for a few minutes till the wind pushes us nearly out of the channel and then start the engine and motor a little ways, allow her to cool, motor again etc till I am nearly back. *Finally, for no apparent reason, she suddenly starts to work again with no alarm with definite water flow. back at the dock, I run her at high rpm for 15 minutes to see if she will do it again and nothing happens. My working theory about the diesel overheating is that there may be an air bubble in the raw water cooling (it is a heat exchanger type with raw water cooling the fresh water/antifreeze via a heat exchanger). *I have changed the impeller and was very careful to follow the diagram to get the vanes pointing the right way last year. *I think the air bubble impedes the flow until it finally gets enough flow to overcome it. *Thoughts? The Dodge, I simply took to Advance auto and got a bottle of Bars Leak and put it in, I plan to buy a radiator online. *The replacement radiators seem to be plastic and without taking the old one out I cannot tell if it is plastic, anybody know? *If the old one is metal, I'd rather get it soldered. *Anybody know? *My radiator in my 1986 Nissan is plastic so the 1988 Dodge may also be. *Anybody know? I actually got my Nissan running again, we all thought it had a bad in- tank fuel pump. *Weird electrical problems nmade me suspicious of this diagnosis so I went over all the ground connections and replaced the battery, battery terminals and battery cables, dang if she doesnt run again. Don't know for sure, but I'm betting it's metal. Even if it's not, you can repair plastic radiators. Are you sure it's the radiator? If it is a crack in the tank part, you can epoxy it, but first, drill a small hole in each end of the crack to prevent the crack from traveling. |
#3
posted to rec.boats
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overheating
On Sep 21, 3:33 pm, wrote:
On Sep 21, 2:28 pm, wrote: I have a thing for driving ancient vehicles, I like to think it is the ultimate male thing of futiley fighting entropy, other people just think I'm cheap. So, I drive either a 1988 Dodge Ramcharger or a 1986 Nissan. The Nissan has been out of it for awhile so I drive the Ramcharger. Fri night, my son borrowed it for a date. he calls about 12:30 am saying it is steaming and smelling awful. I sleepily tell him to park it at her house and have her give him a ride home and fell asleep. After all, either he has ruined the engine or he hasnt, in either case it isnt a financial disaster. Sat Morn, he is home and the Ramcharger is in the driveway and he told me he drove it home (about 5 miles) steaming. I didnt even get mad, just told him that you cannot treat an old vehicle that way. Somehow this kid who is very computer savvy has no concept how mechanical things work and doesnt like getting his hands dirty. OK, so we decide to go sailing. Get to the coast in my wifes Toyota Highlander, get aboard my 1981 S2 with 13 hp Yanmar diesel and start motoring out the channel. get almost all the way out when the engine alarm comes on indicating overheating. Damn, even if we put up the sail we cannot sail against the wind down the channel. I check for water flow out the exhaust and cannot really tell, although I think that when it flows well I can tell. So, I allow it to cool for a few minutes till the wind pushes us nearly out of the channel and then start the engine and motor a little ways, allow her to cool, motor again etc till I am nearly back. Finally, for no apparent reason, she suddenly starts to work again with no alarm with definite water flow. back at the dock, I run her at high rpm for 15 minutes to see if she will do it again and nothing happens. My working theory about the diesel overheating is that there may be an air bubble in the raw water cooling (it is a heat exchanger type with raw water cooling the fresh water/antifreeze via a heat exchanger). I have changed the impeller and was very careful to follow the diagram to get the vanes pointing the right way last year. I think the air bubble impedes the flow until it finally gets enough flow to overcome it. Thoughts? The Dodge, I simply took to Advance auto and got a bottle of Bars Leak and put it in, I plan to buy a radiator online. The replacement radiators seem to be plastic and without taking the old one out I cannot tell if it is plastic, anybody know? If the old one is metal, I'd rather get it soldered. Anybody know? My radiator in my 1986 Nissan is plastic so the 1988 Dodge may also be. Anybody know? I actually got my Nissan running again, we all thought it had a bad in- tank fuel pump. Weird electrical problems nmade me suspicious of this diagnosis so I went over all the ground connections and replaced the battery, battery terminals and battery cables, dang if she doesnt run again. Don't know for sure, but I'm betting it's metal. Even if it's not, you can repair plastic radiators. Are you sure it's the radiator? If it is a crack in the tank part, you can epoxy it, but first, drill a small hole in each end of the crack to prevent the crack from traveling. The replacement tanks are plastic. if it is plastic, the replacement is only $155. |
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