Swampmouse2
Seaman
- Joined
- Mar 26, 2014
- Messages
- 52
Hey Guys,
I got something that I am completely stumped and am just looking for a little advice before I take it to the professionals at the repair shop tomorrow. I have 1992 Yamaha 4.3 stern drive. When I put her up for the winter, she ran like a top! No issues at All.
I got a new impeller from Capt. Ken and put her in..everything good on that front. I took her to the lake the other day and fired her up. By the time I got out of the no wake zone (50 yds.) and romped down on the throttle, I started running hot almost immediately. I cut it off and got a friendly passerby to give me the short tow back to the dock.
I was thinking thermostat....so I took it home, removed the thermostat, rtv'd the housing back together, and went back to the lake.
Without the thermostat in it, it was running great for about 5 minutes, water temp was staying around 125-130 degrees. When I got back to the bouys, I noticed the temp started going up quickly. I ran it another short distance, and sure enough up it went again to about 200-210. I quickly got it back to the dock. That was without the thermostat in it. Seems like I read somewhere that that motor will not cool correctly if the thermostat is not in it???? By the way, just as a side note, I put the thermostat in a pot and it was opening and closing at temperature ( I believe it was opening around 150 , with no gaps or holes in it when closed either.
I know the water pump is pumping because : 1) I physically put my hand on the impeller cover when the motor was running hot and it was cool to the touch, 2) when I was replacing my impeller (at Capt. Ken's advice - thank you Capt.!) I sucked on one of the ports and was able to draw suction and hold it against my hand on the other port for a while.
I also checked for debris at the power steering oil cooler, and even back flushed the hose going from the oil cooler to the thermostat housing from the top down. There were a few small pieces of impeller vanes in there but nothing major to clog water flow. (I had already cleaned that before I winterized it)
Also the oil is crystal clear - no water in the oil.
I am at a loss at this point.
Anyone got any suggestions on another part that may have went bad??
Thanks!
SM
I got something that I am completely stumped and am just looking for a little advice before I take it to the professionals at the repair shop tomorrow. I have 1992 Yamaha 4.3 stern drive. When I put her up for the winter, she ran like a top! No issues at All.
I got a new impeller from Capt. Ken and put her in..everything good on that front. I took her to the lake the other day and fired her up. By the time I got out of the no wake zone (50 yds.) and romped down on the throttle, I started running hot almost immediately. I cut it off and got a friendly passerby to give me the short tow back to the dock.
I was thinking thermostat....so I took it home, removed the thermostat, rtv'd the housing back together, and went back to the lake.
Without the thermostat in it, it was running great for about 5 minutes, water temp was staying around 125-130 degrees. When I got back to the bouys, I noticed the temp started going up quickly. I ran it another short distance, and sure enough up it went again to about 200-210. I quickly got it back to the dock. That was without the thermostat in it. Seems like I read somewhere that that motor will not cool correctly if the thermostat is not in it???? By the way, just as a side note, I put the thermostat in a pot and it was opening and closing at temperature ( I believe it was opening around 150 , with no gaps or holes in it when closed either.
I know the water pump is pumping because : 1) I physically put my hand on the impeller cover when the motor was running hot and it was cool to the touch, 2) when I was replacing my impeller (at Capt. Ken's advice - thank you Capt.!) I sucked on one of the ports and was able to draw suction and hold it against my hand on the other port for a while.
I also checked for debris at the power steering oil cooler, and even back flushed the hose going from the oil cooler to the thermostat housing from the top down. There were a few small pieces of impeller vanes in there but nothing major to clog water flow. (I had already cleaned that before I winterized it)
Also the oil is crystal clear - no water in the oil.
I am at a loss at this point.
Anyone got any suggestions on another part that may have went bad??
Thanks!
SM