Since I replaced my impeller and lost the coolant during the change, I refilled the system and on the first ride I checked the engine compartment to see the bottle was full and coming out the top of the overflow bottle.
****UPDATE**** So after all the great information I went out this am and saw that the FULL bottle had returned back to the system..
So I went to boat supply place and picked up a new pressure cap (14), could not find a 16. Bought new correct coolant, drained the HE, refilled according to mercruiser method, ( thanks Boat Tech) started it up and went for a cruise down the inter coastal about 1200 RPM's the whole time.
Within 20 min. to a half hour it was apparent that the bottle was once again filling. and by 45 Min. it was coming out the overfull on the bottle. So turn around head back to the dock, ( by the way TEMP was always a perfect 165) but I was concerned that eventually I would be low on coolant and overheat as it continued to pee out the top of the bottle. (never budged of 165) So here's what I observed, while my wife was driving I felt all around the H.E the top near the cap was hot, and most of the top was hot, but the end caps were almost cool to the touch as well as the bottom. I did pull the two end caps off just to see if there was a blockage and there was nothing. I just can't figure out why the coolant is being forced out the over flow hose. 1.5 years ago I did have the H.E repaired for leaking tubes but it has been good since. By the way NO BUBBLES and engine is running perfect. Thanks for the help I really appreciate it. Rick
****UPDATE**** So after all the great information I went out this am and saw that the FULL bottle had returned back to the system..
So I went to boat supply place and picked up a new pressure cap (14), could not find a 16. Bought new correct coolant, drained the HE, refilled according to mercruiser method, ( thanks Boat Tech) started it up and went for a cruise down the inter coastal about 1200 RPM's the whole time.
Within 20 min. to a half hour it was apparent that the bottle was once again filling. and by 45 Min. it was coming out the overfull on the bottle. So turn around head back to the dock, ( by the way TEMP was always a perfect 165) but I was concerned that eventually I would be low on coolant and overheat as it continued to pee out the top of the bottle. (never budged of 165) So here's what I observed, while my wife was driving I felt all around the H.E the top near the cap was hot, and most of the top was hot, but the end caps were almost cool to the touch as well as the bottom. I did pull the two end caps off just to see if there was a blockage and there was nothing. I just can't figure out why the coolant is being forced out the over flow hose. 1.5 years ago I did have the H.E repaired for leaking tubes but it has been good since. By the way NO BUBBLES and engine is running perfect. Thanks for the help I really appreciate it. Rick