I always knew owning a boat was a major maintenence pita but this boat has me ready to throw in the towel.. 
Hoping some history and symptoms might help get a diagnosis from someone here:
A little quick history - this winter the block cracked on the outer water jacket under the exhaust manifold. Was a small crack, oil was clean so used some JB weld to repair and a month later seems to have help up perfectly. I changed the impeller about 2 weeks ago one day while it was out of the water, had a difficult time getting the halves back together but finally did - and reverse hasn't worked great since. (keep adjusting cable and sometimes it shifts sometimes it doesn't. (forward and neutral are fine). Last week after a lot of rain I found almost a foot of water in the bilge so I drained gas tank and changed oil twice and fuel filter. Finally get her running good again and probably got a good 4-5 hours of use yesterday - all seemed well. I'm OCD with watching the temp guage and never got hotter than 150. After sitting for 2-3 hours a group of my friends took the boat out without me and after only 5 minutes or so we saw them coming around the corner pretty slowly then smoke came pouring out of the engine compartment.. It was significant, looked like a fire from the shore! A couple of us got in paddle boats and pulled the boat back, the engine sounded like it was sizzling, I'm assuming the oil was actually boiling, after a half hour or so I checked the oil and it looked fine but it was thick like molassas.
I've been assuming there's a high likelihood the engine is toast now but decided to take a closer look this morning. I thought maybe something went wrong with the impeller so pulled the hose that comes from the transom to the water pump and started it up for a second - no water was coming out. Thought I'd confirmed the brand new impeller failed for some reason. Got it out of the water and dropped the lower and while there was much more carbon and scorching (including minor bubbling on the impeller housing and a completely melted guide tube) the impeller was fine. I could also tell there was definitely water in this cavity around the impeller housing and drive shaft.
I'd been wondering if all was ok with the exhaust and if an issue there would explain any of this. When I removed the manifold to repair the cracked block, I also replaced the riser gasket, I did notice that after that time, theres been a very small amount of water that trickles out from where the riser connects to the metal exhaust tube - was such a small amount didn't think i was a big deal. I never checked the exhaust flaps, not sure if they'd cause any of this.
Does all this connect in any way??
Hoping some history and symptoms might help get a diagnosis from someone here:
A little quick history - this winter the block cracked on the outer water jacket under the exhaust manifold. Was a small crack, oil was clean so used some JB weld to repair and a month later seems to have help up perfectly. I changed the impeller about 2 weeks ago one day while it was out of the water, had a difficult time getting the halves back together but finally did - and reverse hasn't worked great since. (keep adjusting cable and sometimes it shifts sometimes it doesn't. (forward and neutral are fine). Last week after a lot of rain I found almost a foot of water in the bilge so I drained gas tank and changed oil twice and fuel filter. Finally get her running good again and probably got a good 4-5 hours of use yesterday - all seemed well. I'm OCD with watching the temp guage and never got hotter than 150. After sitting for 2-3 hours a group of my friends took the boat out without me and after only 5 minutes or so we saw them coming around the corner pretty slowly then smoke came pouring out of the engine compartment.. It was significant, looked like a fire from the shore! A couple of us got in paddle boats and pulled the boat back, the engine sounded like it was sizzling, I'm assuming the oil was actually boiling, after a half hour or so I checked the oil and it looked fine but it was thick like molassas.
I've been assuming there's a high likelihood the engine is toast now but decided to take a closer look this morning. I thought maybe something went wrong with the impeller so pulled the hose that comes from the transom to the water pump and started it up for a second - no water was coming out. Thought I'd confirmed the brand new impeller failed for some reason. Got it out of the water and dropped the lower and while there was much more carbon and scorching (including minor bubbling on the impeller housing and a completely melted guide tube) the impeller was fine. I could also tell there was definitely water in this cavity around the impeller housing and drive shaft.
I'd been wondering if all was ok with the exhaust and if an issue there would explain any of this. When I removed the manifold to repair the cracked block, I also replaced the riser gasket, I did notice that after that time, theres been a very small amount of water that trickles out from where the riser connects to the metal exhaust tube - was such a small amount didn't think i was a big deal. I never checked the exhaust flaps, not sure if they'd cause any of this.
Does all this connect in any way??
