05-13-2007, 04:14 PM
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CC Member
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Join Date: Feb 2007
Location: Idaho Falls,
ID
Cobra Make, Engine: FFR Mrk III 427 SO TP 2x4 and a toploader
Posts: 48
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Aluminum Block Freeze Plugs - Leaking
I have had these damn plugs out numerous times to try and seal them. I have tried about every sealant that exists and still cannot get them to stop leaking. I even bought a tap, modified it, and chased the threads. I don't dare thread them tighter due to breaking the casting (2 TFFT rule of thumb and I am around 2-1/2) and wonder what the *%$$ to do next. After a few heat cycles they start to leak around the threads again. I am not sure where to go at this point. Its not big leaks, just weeping and I have to top off periodically.
Anyone else have this kind of issue with threaded freeze plugs in an aluminum block?
Should I just keep tightening them until they seal? The 2-1/2 turns is pretty damn tight.
Any recommended coolant system stop leak additive? I have been considering using Copper Coat.
I'm really frustrated with this as I cannot get a permanent seal. Sealant works (Caterpillar Form-A-Gasket has been the best and longest lasting so far) for a 100 miles or so.
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