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Mercruiser 170 Problems
I have this old fresh water cooled 170HP Mercruiser inboard, that runs
great. I replaced the impeller, and still no water circulates into the heat exchanger. I looked for clogs, with no luck. I removed the old stator charging circuit, which I had replaced with a standard alternator this past summer. So my question is can I install a radiator with an electric fan to eliminate the salt water altogether? If so, any tips? Thank you Jim Rojas |
Mercruiser 170 Problems
On Sat, 05 Apr 2008 15:27:13 GMT, Jim Rojas
wrote: So my question is can I install a radiator with an electric fan to eliminate the salt water altogether? If so, any tips? Not if you want to be in compliance with USCG and ABYC standards. It's really not a good idea - check with your insurance company. It really shouldn't be that difficuly to get your FWC working. My guess is that the problem is in the leg. There is a procedure that must be followed when replacing the impeller to make sure that the water passage stays open. |
Mercruiser 170 Problems
Ok. What if I just used a continuous duty electric water pump instead?
I have seen some that are self priming, and wont burn out if ran dry. I guess this would be a cheaper alternative. I may also install a seperate water pickup under the engine area to reduce lift issues. I am also thinking that installing a weep hole to insure the damn thing is pumping as it should. Jim Rojas Wayne.B wrote: On Sat, 05 Apr 2008 15:27:13 GMT, Jim Rojas wrote: So my question is can I install a radiator with an electric fan to eliminate the salt water altogether? If so, any tips? Not if you want to be in compliance with USCG and ABYC standards. It's really not a good idea - check with your insurance company. It really shouldn't be that difficuly to get your FWC working. My guess is that the problem is in the leg. There is a procedure that must be followed when replacing the impeller to make sure that the water passage stays open. |
Mercruiser 170 Problems
"Jim Rojas" wrote in message news:lTMJj.615$4Q1.344@trnddc06... I have this old fresh water cooled 170HP Mercruiser inboard, that runs great. I replaced the impeller, and still no water circulates into the heat exchanger. I looked for clogs, with no luck. I removed the old stator charging circuit, which I had replaced with a standard alternator this past summer. So my question is can I install a radiator with an electric fan to eliminate the salt water altogether? If so, any tips? Thank you Jim Rojas To your question the answer is no. Does water pump to the heat exchanger? You need to undo a hose to know. |
Mercruiser 170 Problems
Jim wrote:
"Jim Rojas" wrote in message news:lTMJj.615$4Q1.344@trnddc06... I have this old fresh water cooled 170HP Mercruiser inboard, that runs great. I replaced the impeller, and still no water circulates into the heat exchanger. I looked for clogs, with no luck. I removed the old stator charging circuit, which I had replaced with a standard alternator this past summer. So my question is can I install a radiator with an electric fan to eliminate the salt water altogether? If so, any tips? Thank you Jim Rojas To your question the answer is no. Does water pump to the heat exchanger? You need to undo a hose to know. Yes, I have done that. I took it apart and ran water through the heat exchanger. The engine stays cool. I also ran water downwards to the intake, and it flows. If I use the muffs and try to pump water up, there is no continuous flow at all. Jim Rojas |
Mercruiser 170 Problems
On Apr 5, 11:07*am, Jim Rojas wrote:
Jim wrote: "Jim Rojas" wrote in message news:lTMJj.615$4Q1.344@trnddc06... I have this old fresh water cooled 170HP Mercruiser inboard, that runs great. I replaced the impeller, and still no water circulates into the heat exchanger. I looked for clogs, with no luck. I removed the old stator charging circuit, which I had replaced with a standard alternator this past summer. So my question is can I install a radiator with an electric fan to eliminate the salt water altogether? If so, any tips? Thank you Jim Rojas To your question the answer is no. Does water pump to the heat exchanger? You need to undo a hose to know. Yes, I have done that. I took it apart and ran water through the heat exchanger. The engine stays cool. I also ran water downwards to the intake, and it flows. If I use the muffs and try to pump water up, there is no continuous flow at all. Jim Rojas- Hide quoted text - - Show quoted text - |
Mercruiser 170 Problems
On Apr 5, 11:20*am, Tim wrote:
On Apr 5, 11:07*am, Jim Rojas wrote: Jim wrote: "Jim Rojas" wrote in message news:lTMJj.615$4Q1.344@trnddc06... I have this old fresh water cooled 170HP Mercruiser inboard, that runs great. I replaced the impeller, and still no water circulates into the heat exchanger. I looked for clogs, with no luck. I removed the old stator charging circuit, which I had replaced with a standard alternator this past summer. So my question is can I install a radiator with an electric fan to eliminate the salt water altogether? If so, any tips? Thank you Jim Rojas To your question the answer is no. Does water pump to the heat exchanger? You need to undo a hose to know.. Yes, I have done that. I took it apart and ran water through the heat exchanger. The engine stays cool. I also ran water downwards to the intake, and it flows. If I use the muffs and try to pump water up, there is no continuous flow at all. Jim Rojas- Hide quoted text - - Show quoted text -- Hide quoted text - - Show quoted text - I don't know what happened. Sorry. But with a hose, you're actually injecting water into the block. have you tested the engines water pump? I was going to say with salt it could have eroded the inside impeller. Also possible to have a bad thermostat. |
Mercruiser 170 Problems
Jim Rojas wrote:
I have this old fresh water cooled 170HP Mercruiser inboard, that runs great. I replaced the impeller, and still no water circulates into the heat exchanger. I looked for clogs, with no luck. I removed the old stator charging circuit, which I had replaced with a standard alternator this past summer. So my question is can I install a radiator with an electric fan to eliminate the salt water altogether? If so, any tips? Thank you Jim Rojas It wouldn't be practical. There are, though, completely closed cooling systems that do not require the usual sort of heat exchanger. _ http://tiny.cc/0jZfP The exchanger is mounted outside the boat, on or along or adjacent to the keel. No outside water enters the system anywhere. But then you have to accommodate the exhaust. There are "dry" ways to do that, too. |
Mercruiser 170 Problems
On Sat, 05 Apr 2008 17:07:40 GMT, Jim Rojas
wrote: Yes, I have done that. I took it apart and ran water through the heat exchanger. The engine stays cool. I also ran water downwards to the intake, and it flows. If I use the muffs and try to pump water up, there is no continuous flow at all. It sounds like you have an obstruction in your leg. Have a qualified Mercruiser guy take a look at it, might be a simple fix if it was assembled incorrectly after the impeller change. There is an insert that has to be positioned properly as you re-attach the leg. |
Mercruiser 170 Problems
"Jim Rojas" wrote
I took it apart and ran water through the heat exchanger. The engine stays cool. I also ran water downwards to the intake, and it flows. If I use the muffs and try to pump water up, there is no continuous flow at all. There aren't a whole lot of things that can go wrong with that type of pump. If it isn't pumping water and there's no obstruction in the line, the base gasket could be installed incorrectly or the key that locks the impeller to the shaft could be missing. It may also be possible for the cylinder liner that the impeller rotates in to spin inside the housing, but I've never seen that happen. |
Mercruiser 170 Problems
Regarding the original question, anything's possible, and I know firsthand
what a PITA it is to have to dissassemble a drive unit that you just put back together, but when all is said and done it would be easier, cheaper, and more reliable to fix the pump than to cobble together a closed cooling system. |
Mercruiser 170 Problems
"Tim" wrote in message ... On Apr 5, 11:07 am, Jim Rojas wrote: Jim wrote: "Jim Rojas" wrote in message news:lTMJj.615$4Q1.344@trnddc06... I have this old fresh water cooled 170HP Mercruiser inboard, that runs great. I replaced the impeller, and still no water circulates into the heat exchanger. I looked for clogs, with no luck. I removed the old stator charging circuit, which I had replaced with a standard alternator this past summer. So my question is can I install a radiator with an electric fan to eliminate the salt water altogether? If so, any tips? Thank you Jim Rojas To your question the answer is no. Does water pump to the heat exchanger? You need to undo a hose to know. Yes, I have done that. I took it apart and ran water through the heat exchanger. The engine stays cool. I also ran water downwards to the intake, and it flows. If I use the muffs and try to pump water up, there is no continuous flow at all. Jim Rojas- Hide quoted text - - Show quoted text - The muffs must fit tightly and there has to be sufficient water pressure. You may have put the pump together wrong. Pieces from a disintegrated impeller might be blocking or stopping flow. The copper tube in the upper unit might have fallen out. The plastic piece that holds that tube might have melted due to an overheat. The rubber hose that connects the bell housing to transom plate may have ruptured. the fitting that connects the intake hose to the aforementioned hose might have rotted out. Finally make sure the prop spins when you put it in gear. If it doesn't the driveshaft is probably broken. Good luck man |
Mercruiser 170 Problems
I installed the 12v electric water pump, where the old stator module use
to be...now the water flows just fine, and picks up water from the lower end. I still plan to install a water pickup directly under the engine through the hull floor. Jim Rojas |
Mercruiser 170 Problems
Hey Jim,
Just wondering how your 470 is running. We have some cooling system information for that motor online at http://www.sterndrives.com/470_coolant_leak.html which might help. Sterndrives.com also has the information for servicing your sterndrives water pump if you need it. Thanks! |
Mercruiser 170 Problems
On Mar 1, 11:52*am, wrote:
Hey Jim, *Just wondering how your 470 is running. We have some cooling system information for that motor online at *http://www.sterndrives.com/470_coolant_leak.htmlwhich might help. Sterndrives.com also has the information for servicing your sterndrives water pump if you need it. Thanks! It's great to see an old boating thread revived. Thank you! |
Mercruiser 170 Problems
On Saturday, April 5, 2008 at 8:27:13 AM UTC-7, Jim Rojas wrote:
I have this old fresh water cooled 170HP Mercruiser inboard, that runs great. I replaced the impeller, and still no water circulates into the heat exchanger. I looked for clogs, with no luck. I removed the old stator charging circuit, which I had replaced with a standard alternator this past summer. So my question is can I install a radiator with an electric fan to eliminate the salt water altogether? If so, any tips? Thank you Jim Rojas internal water systems are good as far as water cooling. although i have attempted that with results good and bad. I have found that allowing the original system to be connected to the radiator is by far the best result with my experience. i since have installed a couple ball valves inline to restrict some flow from one to the other, for pressure reasons. |
Mercruiser 170 Problems
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