corroded block water fitting

[nemo2011]

The petcock water fitting on the block is built up so as I can not reinstall the petcock .
Is there a way to loosen this residue other than tap and die !?
1989 4.3 L alpha one.

 

[Bondo]

Re: corroded block water fitting

The petcock water fitting on the block is built up so as I can not reinstall the petcock .
Is there a way to loosen this residue other than tap and die !?

Ayuh,.... Ya need a Short tap too...
A standard tap can/ will interfere with the inside wall, before it cuts threads...

Ya might be able to grind flutes into a piece of iron pipe/ fitting to clean 'em up...

 

[nemo2011]

Re: corroded block water fitting

does anyone know the size and thread used on block petcock?

 

[Don S]

Re: corroded block water fitting

1/4 NPT
In the future, when winterizing and you remove the plugs to drain, put the plugs back in so the threads don't get all rusty.
Put a spot of gasket sealer on the plug. More for corrosion resistance than sealing the threads.