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Question:

86 chevy 350 water pump leaking problem?

i replace all the seals on the water pump reinstalled it and the same thing happened... it leaks out the bottom some where and run down the water pump and down the hot side radiator hose... any ideas?

Answer:

you reinstalled the old pump? most water pump area leaks are the water pump itself. it will have a small hole located near where the lower hose hooks up, that hole is called the weep hole. when a pump begins failing it begins weeping. a water pump for that vehicle is only about $30. so cheap you should never even think of reusing the old pump if you remove it for any reason. you'll need to replace teh gasket, again, and you'll want to use blue rtv high temp silicone lightly on the gasket.
look up the torque spec's in either a hayne's/chilton's manual, or online to see if you have it tightened correctly, and using some high-temp RTV on both sides of the gasket before you install it should help. most auto part stores have torque wrenches to rent for a day. Also, there may be a certain order you have to tighten the bolts down.
Chevy 350 Water Pump
With the labor, time, and seals you wasted trying to rebuild your old pump you could have put a factory rebuilt unit on. Sometimes you just gotta break down and spend the extra cash to do it right.
Definitely a gasket issue, if you just had it replaced, then whoever did it either tore the gasket by accident, didn't put proper amount of RTV silicone, or didn't tighten it up enought.

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