Need some more help with the overheat problem I described in thread: 88 Suzuki 150hp Overheating
As I explained I just replaced water pump impeller and now Im getting an intermittent beep, beep, which prompted me to check with a laser gun and when it showed about 175/180 degrees on one c-head plus an extremely hot pee stream I turned it off. Other head was holding at about 115/120.
Its been at least one year since I had run the engine and as I remember the pee stream then was almost non existent. After I did the new impeller and restarted at idle the pee stream was coming but not with a lot of force, then about a minute later it started coming with a lot of force for about 30 seconds, then reverted back to
the lesser (but steady) flow.
I had some trouble getting it to fire the other day so I disconnected the oil injection wiring that goes to the top of the oil tank in order to move tank out of way so I could check that fuel pumps were sending fuel to the carbs which they were and eventually I got it to run (I had cleaned the carbs). Now Im wondering whether the beep, beep I was getting was an oil system warning rather than an overheat warning (I was running on fuel that I had premixed so as not to take chances). Nevertheless the laser gun produced the above heat readings and when the pee stream became too hot to feel I quickly turned off the engine. I then pulled the thermostat on the hot side which has since checked out ok on the stove. This prompts the following questions:
1 Im assuming I would have overheat on both heads if I had re-installed lower gear case incorrectly? During the re-installation at one point I kind of cocked the lower unit slightly as I pushed upward. Also, when torqueing the water pump housing down over the new impeller I wasnt sure of the exact mm size of bolt in order to determine the correct foot pounds but I think its probably pretty close.
2. should I have let the temp build beyond that 180 degree (pee stream was real hot too), hoping it might drop down, before turning it off? It had run 3/5 minutes before I turned it off.
3. What should be my next steps? Im not anxious to pull the entire power head unless I absolutely have to. Will removing the cylinder head cover help me or will I need to remove the entire head? Whats best process to clean a caked head?
4. A flushing solution has been suggested so as not to have to remove components? If this makes sense, do you know of any? Could I do it through thermostat hole or somewhere else? Do I need to drop the lower unit again to do a flush? Can I run the engine without causing damage for a short time, leaving the thermostat hole open, if it makes sense? Should I blow compressed air in through thermostat hole or somewhere else, hoping to blow out any obstruction?
Will appreciate your thoughts
Bill
As I explained I just replaced water pump impeller and now Im getting an intermittent beep, beep, which prompted me to check with a laser gun and when it showed about 175/180 degrees on one c-head plus an extremely hot pee stream I turned it off. Other head was holding at about 115/120.
Its been at least one year since I had run the engine and as I remember the pee stream then was almost non existent. After I did the new impeller and restarted at idle the pee stream was coming but not with a lot of force, then about a minute later it started coming with a lot of force for about 30 seconds, then reverted back to
the lesser (but steady) flow.
I had some trouble getting it to fire the other day so I disconnected the oil injection wiring that goes to the top of the oil tank in order to move tank out of way so I could check that fuel pumps were sending fuel to the carbs which they were and eventually I got it to run (I had cleaned the carbs). Now Im wondering whether the beep, beep I was getting was an oil system warning rather than an overheat warning (I was running on fuel that I had premixed so as not to take chances). Nevertheless the laser gun produced the above heat readings and when the pee stream became too hot to feel I quickly turned off the engine. I then pulled the thermostat on the hot side which has since checked out ok on the stove. This prompts the following questions:
1 Im assuming I would have overheat on both heads if I had re-installed lower gear case incorrectly? During the re-installation at one point I kind of cocked the lower unit slightly as I pushed upward. Also, when torqueing the water pump housing down over the new impeller I wasnt sure of the exact mm size of bolt in order to determine the correct foot pounds but I think its probably pretty close.
2. should I have let the temp build beyond that 180 degree (pee stream was real hot too), hoping it might drop down, before turning it off? It had run 3/5 minutes before I turned it off.
3. What should be my next steps? Im not anxious to pull the entire power head unless I absolutely have to. Will removing the cylinder head cover help me or will I need to remove the entire head? Whats best process to clean a caked head?
4. A flushing solution has been suggested so as not to have to remove components? If this makes sense, do you know of any? Could I do it through thermostat hole or somewhere else? Do I need to drop the lower unit again to do a flush? Can I run the engine without causing damage for a short time, leaving the thermostat hole open, if it makes sense? Should I blow compressed air in through thermostat hole or somewhere else, hoping to blow out any obstruction?
Will appreciate your thoughts
Bill