Triple502
Seaman
- Joined
- Oct 22, 2016
- Messages
- 66
Okay, I have been a reader of topics for years, and always seemed to find my answers to my boating questions. I know the topic of hydrolock has been addressed here many times, but I can't quite find the answer to a question. The other day I took the boat out to pump the head and enjoy the mid 80s day here in Southern MD. After pumping the head, the starboard motor wouldn't turn over. Like many people I assumed the starter went bad and putted back on the port motor. Upon research, I discovered the motor had hydrolocked. I removed the spark plugs, manifolds and risers. I was able to get the motor free with a breaker bar and used fogging oil into the cylinders (it was all I had at the time). The next day I put Marvel's Mystery oil in the cylinders. As I bumped the starter, water shot out of the 2 middle cylinders on the starboard side. I continued the process and water continued to come out. I sprayed the cylinders and left for the day. Came back down and started the process over and water continues to come out only those 2 cylinders. I did a compression check and all cylinders are in the mid to upper 140s. There is no water in the oil. My question is if the exhaust valve is stuck or if there is a problem with the head, would the raw water pump still be pumping water to the problem areas even by just bumping the starter? It seems like the water is never ending. Is there really that much water sitting on top of that piston? Is there an easier/better way of getting it out? I really would prefer not to tear the motor down. I am running 1995 Mercruiser 5.7, 4bbl, Bravo II drives, unknown hours. I should note that the riser and manifolds looked pretty good when I took them off. I am no expert but it appears that the riser gasket may have failed based on the small amount of corrosion where it mates up to the exhaust manifold. There was water sitting in the bottom of that exhaust manifold when I pulled it off, which leads me to believe it was a riser/manifold issue. Also, there appears to be surface rust on the exhaust ports on the starboard side only. Any thoughts would be appreciated.