My 424 is an ’81 but with an ’87 engine. I recently had a cracked exhaust elbow spewing soot into the boat. My mechanic replaced all 4 elbows with new gaskets, etc and removed the manifold tank and flowconqtroller for cleaning. There is no longer an exhaust leak but the end result is we can’t adequate coolant to go to the hot water tank – so no hot water. I followed up after the mechanic – replaced all the 7/8″ hoses and even flushed out the coolant coil inside the hot water tank as well as the reservoir tank and T fitting in the port cockpit locker. STILL no hot water!! Has anyone had this problem? Are there special tricks to make sure the system has no air bubbles. I’m certain the flowcontroller “spring” is in place. I’m convinced the reverse position of the engine with V drive and the longer hoses and bends contribute to the problem, no?? Any advice is greatly appreciated. My W58 runs great; I can’t justify an engine replacement just to get hot water…..Bob T.