Petcock leaking

[Aron Gleason]

So after getting the front of the motor back together I go to fill the radiator and antifreeze is leaking out the petcock. Go to get a new petcock, put thread sealer on it. Get it tight, and its leaking. Threads are good, and the lower tank is fine. What could be the problem?

 

[MWbirdLOVER70]

So after getting the front of the motor back together I go to fill the radiator and antifreeze is leaking out the petcock. Go to get a new petcock, put thread sealer on it. Get it tight, and its leaking. Threads are good, and the lower tank is fine. What could be the problem?

Maybe small crack around the petcock area?

 

[Aron Gleason]

Maybe small crack around the petcock area?

I don't see a small crack anywhere. Was told it could be a bad petcock

 

[MWbirdLOVER70]

I don't see a small crack anywhere. Was told it could be a bad petcock

Possible with today’s supply chain of parts. If it does it again with another petcock, I’d say pressure test the radiator and know for sure where’s it’s happening or pull radiator and take it in for shop opinion

 

[Jeff K]

Assuming it's NPT, you could try swapping it out with a pipe plug and see if the leak remains.

 

[khryslerkid]

How bad of a leak is it?

Dumb question...are you turning it in the right direction?

 

[MWbirdLOVER70]

Assuming it's NPT, you could try swapping it out with a pipe plug and see if the leak remains.

That’s actually a good idea providing it’s NPT thread

 

[Aron Gleason]

How bad of a leak is it?

Dumb question...are you turning it in the right direction?

Im turning the wingnut to the right closer to the nut

 

[Aron Gleason]

Possible with today’s supply chain of parts. If it does it again with another petcock, I’d say pressure test the radiator and know for sure where’s it’s happening or pull radiator and take it in for shop opinion

this is the petcock I got.

 

[440 4 speed]

View attachment 1917746this is the petcock I got.

See if you can find one from an old radiator.

 

[Aron Gleason]

See if you can find one from an old radiator.

Im trying to do that

 

[matthon]

On mine, I put a brass 90, a small ball valve, then a nipple.

No more leaks, and if I need to drain, it doesn't spray all over the k-frame and everything else.

Also, I can put a length of hose on it and drain it directly into anything.

 

[Aron Gleason]

How bad of a leak is it?

Dumb question...are you turning it in the right direction?

It leaks out as fast as I put water in

 

[khryslerkid]

It leaks out as fast as I put water in

I know sometimes I'll turn it the wrong direction thinking you turn it to the right to tighten it but it's actually the opposite to cut it off. I've had them both ways.

 

[kiwigtx]

So after getting the front of the motor back together I go to fill the radiator and antifreeze is leaking out the petcock. Go to get a new petcock, put thread sealer on it. Get it tight, and its leaking. Threads are good, and the lower tank is fine. What could be the problem?

Contact @themechanic to see how he handled his petcock.

 

[440 4 speed]

If the rad is empty, I suggest pull the petcock and check to see the closed position of the valve. You might be able to see if it is closing tightly.

 

[Aron Gleason]

If the rad is empty, I suggest pull the petcock and check to see the closed position of the valve. You might be able to see if it is closing tightly.

I'll do that

 

[Aron Gleason]

I know sometimes I'll turn it the wrong direction thinking you turn it to the right to tighten it but it's actually the opposite to cut it off. I've had them both ways.

Hmmm. Interesting, I didn't think of that

 

[Aron Gleason]

Well wouldn't you know it, I was turning the wingnut the wrong way thinking I was closing it, when I was actually opening it.

 

[Davefinan]

How bad of a leak is it?

Dumb question...are you turning it in the right direction?

Looks like it wasn’t a dumb question after all.