Last winter I rebuilt my Mercruiser 470, sent the cam to a cam shop where they welded up the groves where the water pump seal rides and ground it back down. Not knowing if they got the hardness right I put a speedi sleeve on it just to be safe. After one or two tanks of fuel I was getting coolant out the weep hole. I followed the procedure documented at Mercruiser 470 Coolant Leak using the in-boat method. Since the cam / speedi sleeve looked perfect I just replaced the seal. After using about a tank of fuel the leak returned.
So I read up on it some more, made sure I was not putting the seal in backwards, not mis-aligned with the speedi-sleeve, and generally tried to be more careful (but not finding anything I could point to as the root cause). I thought maybe the third time was the charm because after a full tank of fuel it was not leaking. But half way through the second tank the leak was back, added about 6 oz. of coolant, and by the end of the second tank my coolant was dangerously low.
I have it apart again and can't figure out what is going on. The seal looks fine as well as the speedi sleeve but the only way to get coolant out the weep hole is through the seal. Does anyone have any advice?
So I read up on it some more, made sure I was not putting the seal in backwards, not mis-aligned with the speedi-sleeve, and generally tried to be more careful (but not finding anything I could point to as the root cause). I thought maybe the third time was the charm because after a full tank of fuel it was not leaking. But half way through the second tank the leak was back, added about 6 oz. of coolant, and by the end of the second tank my coolant was dangerously low.
I have it apart again and can't figure out what is going on. The seal looks fine as well as the speedi sleeve but the only way to get coolant out the weep hole is through the seal. Does anyone have any advice?