I rebuilt my top end without a manunal, everything went fine, then i noticed the water pump leaking from the weep hole, believing it was the pump, i replaced all gaskets and seals all the way to inside gear cover, it still leaksi , i got a manual and it mentioned e or ex on gasket to go toward ex. could this be the problem?
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On the water pump there is a weep hole when the pump fails they tend to leak out of the weep holes. Its also possible the water pump seal failed too. On this car the timing belt drives the water pump. If you drive on it and the pump locks up. You will be replacing the motor or the whole top end of the engine due to bent valves. Its time to replace the water pump and timing belt. Then you will be good to go again. So do not drive it for the sake of saving your engine. I'd tow it in to the shop or replace the belt and pump yourself.
The only thing I can think on is belt tension. You are turning the tensioner counterclockwise and aligning the arrow with the cut out on the head right? But this is a guess only, even if the belt was too tight it should make noise and go longer than that before the bearing would wear enough for the internal seal to leak.
Most Yamaha water pumps have a "weep hole" on the bottom of the water pump housiing.
Basically your water pump shaft has a coolant seal and an oil seal where it is driven...the weep hole drains away any leakage between the cooalnt and oil seals so cross contamination does not occur.
You probably should look at rebullding the pump. Don't try plugging off the weephole to stop the loss...it will contaminate the oil system.
It could be a number of problems. If coolant is not leaking from the radiator or bad hose the water pump is the most likely culprit. There is a weephole that the water can leak out of and the only way to repair it is to replace the water pump. Good luck
You need to find the source of the leak. it hasn't overheated yet because you keep catching it and re-filling. From your description, it sounds a lot like a bad water pump seal (part of pump) but without physically looking you can't be sure of that. when the pump seal begins to fail, internal pressure while running often will drive the seal tighter against the shaft stopping the leak. as pressure drops as the engine cools, the seal relaxes and permits seepage. With time, that will change and it will leak all the time.