79Formula233
New member
Hi all, I am a new owner of a 79 Formula 233 with twin inline 4's. I'm really excited about this boat, it is in great shape, has been pampered all of its life apparently. The port engine is overheating when running, but it stays cool at an idle. I don't know much about I/O units, this boat has OMC 400's. Each engine has its own cooling system and I think it has heat exchangers in a cylinder about 4 inches across. What is likely causing my engine to overheat and how do I go about testing and repairing it? Thanks, Roy