Alright I am going to start from the beginning because I am a total novice and need all the guidance I can get from you wise gentlemen on the forums. I'm gonna swallow my pride and be totally honest with all my boneheaded mistakes.
I live down in San Diego and bought my first boat, a 1993 Searay Overnighter 240 with a Mercruiser 7.4L 454 with a Bravo outdrive (I'm not sure if its 1 2 or 3) towards the end of last summer. It was running well the first 5 or 6 trips I took it on but in December I was out lobster diving and I blew the hose going from my water pump to my thermostat. I got and OEM replacement hose and installed it. I hooked the boat up to my garden hose to run it and everything was running good. I ran it for about 15 minutes and right after turned it off steam started billowing out of the engine compartment. After some investigation I saw the raw seawater pump was cracked on the impeller housing. I bought an OEM replacement for the seawater pump (not the whole pump, just the impeller and housing) Once I put water through it there was water streaming out of the a hole on the seawater pump which I was told was the weep hole and that the pump needed to be replaced so I bought an aftermarket seawater pump (the entire assembly) and installed it. I also broke the FlushPro that was installed while trying to get the impeller out so I replaced that as well. (the boat came with a flushpro so the hose hookup on the rear of my boat runs down to a flushpro and then into the seawater pump)
Once I got that installed I was trying to turn it over and it was trying for 10 seconds or so without firing up and then I heard a concerning clunk/grinding noise. I stopped immediately when I heard that. The engine would still turn with a wrench though so I figured it was a starter issue not a seized engine. I got the battery charged and cleaned up the terminals and then it would fire up but only with start fluid sprayed on the carb now. Also now when when I turn off the engine there is a clunk after I turn it off as if its doing one extra revolution or something. I also noticed that while I was running it the water in the flushpro looked like it was sitting still not flowing through even though there was water coming out of the drive with the exhaust. I took the hose from the thermostat to the water pump off and turned the garden hose on and had water coming through so I figured it was getting water even though the water in the flushpro looked still.
I foolishly took it on a test drive with a broken temperature gauge and it seemed to be running fine when I put it in the water. I squeezed that water hose going from the water pump to the thermostat and there seemed to be water in it (I realize now it could've just been air pressurizing it) and it seemed to be running fine when I was at idling and at slow speeds. After about 10-15 minutes of the motor running I went to go to higher speed and the engine wouldn't go up to higher rpms (my rpm gauge is also broken new gauges will be at the top of my to do list) it did go up a bit but not enough to get on plane or anything. I then brought it back to idle and and was going to check how hot the engine was and saw white smoke (smelled like burning oil) coming out of the black exhaust hoses and the engine was white hot and then it died.
I got towed back and the next day hooked it up to the hose to run it again. It turned over and ran like before but water is coming out of different spots in my outdrive I think I may have blown some seals in the drive. I ran it for about five minutes and then checked the oil and it doesn't like there's water in it so hopefully the head gasket is still good.
Sorry for the long post I just wanted a complete picture because I didn't want to leave out anything that could have been a contributing factor. I am chalking this up to an expensive learning experience but I don't know where to start to get this thing back in the water. Please help!
I will attach photos and videos in the following order. 1. The hose blowout that started this whole saga. 2. The seawater pump with water coming out of the weephole. 3. The engine running before the test drive (showing still water in the flushpro and water coming out of the outdrive)
4. the engine smoking when it died on the water.
5. the engine on the hose with water coming out of all over the outdrive.
I live down in San Diego and bought my first boat, a 1993 Searay Overnighter 240 with a Mercruiser 7.4L 454 with a Bravo outdrive (I'm not sure if its 1 2 or 3) towards the end of last summer. It was running well the first 5 or 6 trips I took it on but in December I was out lobster diving and I blew the hose going from my water pump to my thermostat. I got and OEM replacement hose and installed it. I hooked the boat up to my garden hose to run it and everything was running good. I ran it for about 15 minutes and right after turned it off steam started billowing out of the engine compartment. After some investigation I saw the raw seawater pump was cracked on the impeller housing. I bought an OEM replacement for the seawater pump (not the whole pump, just the impeller and housing) Once I put water through it there was water streaming out of the a hole on the seawater pump which I was told was the weep hole and that the pump needed to be replaced so I bought an aftermarket seawater pump (the entire assembly) and installed it. I also broke the FlushPro that was installed while trying to get the impeller out so I replaced that as well. (the boat came with a flushpro so the hose hookup on the rear of my boat runs down to a flushpro and then into the seawater pump)
Once I got that installed I was trying to turn it over and it was trying for 10 seconds or so without firing up and then I heard a concerning clunk/grinding noise. I stopped immediately when I heard that. The engine would still turn with a wrench though so I figured it was a starter issue not a seized engine. I got the battery charged and cleaned up the terminals and then it would fire up but only with start fluid sprayed on the carb now. Also now when when I turn off the engine there is a clunk after I turn it off as if its doing one extra revolution or something. I also noticed that while I was running it the water in the flushpro looked like it was sitting still not flowing through even though there was water coming out of the drive with the exhaust. I took the hose from the thermostat to the water pump off and turned the garden hose on and had water coming through so I figured it was getting water even though the water in the flushpro looked still.
I foolishly took it on a test drive with a broken temperature gauge and it seemed to be running fine when I put it in the water. I squeezed that water hose going from the water pump to the thermostat and there seemed to be water in it (I realize now it could've just been air pressurizing it) and it seemed to be running fine when I was at idling and at slow speeds. After about 10-15 minutes of the motor running I went to go to higher speed and the engine wouldn't go up to higher rpms (my rpm gauge is also broken new gauges will be at the top of my to do list) it did go up a bit but not enough to get on plane or anything. I then brought it back to idle and and was going to check how hot the engine was and saw white smoke (smelled like burning oil) coming out of the black exhaust hoses and the engine was white hot and then it died.
I got towed back and the next day hooked it up to the hose to run it again. It turned over and ran like before but water is coming out of different spots in my outdrive I think I may have blown some seals in the drive. I ran it for about five minutes and then checked the oil and it doesn't like there's water in it so hopefully the head gasket is still good.
Sorry for the long post I just wanted a complete picture because I didn't want to leave out anything that could have been a contributing factor. I am chalking this up to an expensive learning experience but I don't know where to start to get this thing back in the water. Please help!
I will attach photos and videos in the following order. 1. The hose blowout that started this whole saga. 2. The seawater pump with water coming out of the weephole. 3. The engine running before the test drive (showing still water in the flushpro and water coming out of the outdrive)
