The water pump is designed with a weep hole to allow coolant to leak from its housing before it can reach the shaft bearing which will cause the shaft to lock up and stop turning. It is normal for the water pump to weep a small amount of coolant from the primary weep hole (black stain at weep passage) Do not replace the water pump if this condition exists Replace the water pump if a heavy deposit or a steady flow of engine coolant is evident from the primary weep passage (fig This pump is designed with a main shaft seal which is used to prevent coolant from leaking from the pump housing, when it fails it allows a leak from the pump's weep hole which is seen in the image below At this point the water pump must be replaced
That is where the water pump is located Under the pump (behind the pulley) there is a weep hole It is a small round hole If the bearing is going bad in the pump, that is where it will leak from Also, you can get a cooling system tester which is nothing more than a pump It pressurizes the cooling system so it is easier to find leaks.
Replace the water pump if a heavy deposit or a steady flow of engine coolant is evident on water pump body from the weep hole (shaft seal failure) Be sure to perform a thorough analysis before replacing water pump. Do not replace the water pump if this condition exists. That darn metal tube that goes into the new water pump, new oring, is leaking I wanted to know if i could use the black rtv around the tube/oring I see it's a common issue with these trucks
I removed as much water as i could and dried up the inlet hole and spread a thin bead of black rtv then a bead around the pipe with oring and pushed it in Hopefully, i got the majority of water in pump.
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