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Don~
To refresh your memory. We chatted a few days ago vai phone regarding an issue with my Atomic 4 which starts immediately, runs beautifully for about 1-2 minutes then fades and stops with a bit of stress, almost as if it was about to seize. Amazingly, she will start immediately and repeat the same process, however the run time becomes shorter and shorter unless she has about a minute or two to recover. My temp gauge indicates she is not running hot. I have no history on the engine and boat (Catalina 27) as I acquired it from a local Rockport Maine YMCA auction in the summer of 2006. Over the winter (2006-2007) I removed the engine from the boat and together with a friend we replaced the exhaust manifold (which had a crack). The block and cylinders looked amazingly clean with very little wear. The valves were ground and seated, the tappets cleaned and adjusted, thoroughly cleaned the water ways and replaced all gaskets. The carburator was cleaned but we did not replace any parts. New plugs, wires, rotor, condenser, coil, hoses, exhaust pipe. Most all essential parts were either cleaned and or replaced.
The compression is at or above 100psi on all four cylinders. Oil pressure indicated is about 40-45 lbs and is level and consistent. I've removed the screen from the gas tank (which was very clean) and have a fuel filter in line. The timing is right on the money. When started, the engine runs superbly and when given the throttle-up she revs up perfectly. Then she slows down (as is a load was on the engine) and stops. There is a little oil smoke too. But as mentioned, she cranks up again immediately without issue. We've checked the neutral position to make sure she is running freely each time (boat is on stands in my home driveway). Uggh! We are really stumped. What could it be?
To refresh your memory. We chatted a few days ago vai phone regarding an issue with my Atomic 4 which starts immediately, runs beautifully for about 1-2 minutes then fades and stops with a bit of stress, almost as if it was about to seize. Amazingly, she will start immediately and repeat the same process, however the run time becomes shorter and shorter unless she has about a minute or two to recover. My temp gauge indicates she is not running hot. I have no history on the engine and boat (Catalina 27) as I acquired it from a local Rockport Maine YMCA auction in the summer of 2006. Over the winter (2006-2007) I removed the engine from the boat and together with a friend we replaced the exhaust manifold (which had a crack). The block and cylinders looked amazingly clean with very little wear. The valves were ground and seated, the tappets cleaned and adjusted, thoroughly cleaned the water ways and replaced all gaskets. The carburator was cleaned but we did not replace any parts. New plugs, wires, rotor, condenser, coil, hoses, exhaust pipe. Most all essential parts were either cleaned and or replaced.
The compression is at or above 100psi on all four cylinders. Oil pressure indicated is about 40-45 lbs and is level and consistent. I've removed the screen from the gas tank (which was very clean) and have a fuel filter in line. The timing is right on the money. When started, the engine runs superbly and when given the throttle-up she revs up perfectly. Then she slows down (as is a load was on the engine) and stops. There is a little oil smoke too. But as mentioned, she cranks up again immediately without issue. We've checked the neutral position to make sure she is running freely each time (boat is on stands in my home driveway). Uggh! We are really stumped. What could it be?
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