proline2550
Cadet
- Joined
- Nov 20, 2004
- Messages
- 22
After three engines and lots of work, what I thought was fixed is back. I have twin 4.3 FWC mercruisers and have had hydrolocking problems with them ever since I bought the boat. At first I thought the fluid problem was missing shutters and a dieseling engine. I replaced the missing shutters and reconditioned the heads. The problem remained so I installed three inch spacers on both engines due to the boat's low waterline with four adults on board. After having one engine go bad, I decided to replace both with brand new base engines. After one of these engines lost oil pressure resulting in a spun bearing, Upon inspection, the engine showed signs of water intrusion. Lost my warranty and put one of the old engines back in. Right now, the boat has one new engine,(110hrs) the other is one of the old engines with new rings, head gaskets and recon heads on it. Both engines smell of antifreeze when running and the heat exchangers are consistantly low when checked before a trip. Put the boat in for the season last night and when I tried to start the older of the two engines, it was locked up. After inpection, the liquid in the cylinders is coolant. When I left the ramp, both heat exchangers were full. Now, both are low. The newer, port side engine started fine but has the tell tale coolant smell. The only parts that are common to all of the engines in this boat are the exhaust manifolds. I let the engine sit for twenty or thirty minutes with the plugs removed and shot a healthy one out both sides of this morning's hydrolocked engine. I drained the manifolds and waited again. Turned the engine over and no more water in the cylinders. Anybody else think that this boat may have frozen resulting in four cracked manifolds? I don't believe it to be a head gasket problem on any of the engines. Thoughts and suggestions would help clear my thoughts. I would like to repair this boat once and for all before I make my own personal reef site! I was a mechanic for 13 years so gimme all the tech you can muster, I'll understand <br /><br /><br />1994 Mercruiser early Vortec V6 Starboard side,12 bolt intake(currently major problem)<br /><br />2005 GM Base 220 HP Vortec V6 Port side. *this engine has eight bolt intake.(has coolant smell from exhaust and steam from exhaust.<br /><br />WOT is 4200RPM<br />Both are Carbureted- four barrel Webers<br /><br />Just want to be as sure about diagnosis before spending 1000 bucks. Any thoughts about GLM aluminum manifolds and risers? What about using cast spacers in between?
<br /><br /><br />Sorry,......... Rant Over............ 