Houston....we have a problem!
Houston....we have a problem!
Just finished up going through an engine that never ran after Winky rebuilt it. It now cranks and runs great, but......it is blowing coolant back out of the overflow bottle. It will suck the coolant out of the bottle when you cut the engine off and will fill the bottle back up and overflowing after just a minute or so of running. I wondered about it having an air pocket, but this is a self bleeding sytem and it has run more than long enough to bleed itself out. My suspicion is that the o-ring between the head and the top of the sleeve did not seal good. I did not replace the o-ring when I went through the motor because it had not been run since Winky rebuilt it and it still felt soft. If anybody has any ideas, I would greatly appreciate the help. Otherwise, I'll be pulling the motor back out tomorrow and replacing the o-ring beneath the head.:mad:
Update.....Did a cylinder leakdown test on the motor and I was getting pressure back in the coolant reservoir. I took the motor back off tonight and took the head off and there was no o-ring on top of the sleeve. I feel kinda stupid for missing that when I put it together, but it was my first Cannondale motor. But, I was going behind Winky and there was no o-ring on the sleeve when I took it apart. Guess I should have paid a little closer attention after all of the other things I found wrong with this "freshly rebuilt Winky motor". Oh well.....live and learn.
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