Entity Eric Zeno spoke thus:

> THESE WILL NOT PROTECT YOUR engine from freezing water
If it does, you are lucky, because "freeze plug" is a misnomer. A certain
percent of engines will just break. I wonder if they are even tested for
design against breaking?
  
> Jim Felder wrote:
>> This is cheap and easy to fix.
I would dispute the "easy" part. The plugs are a bitch to get out. Of
course, the OP already has a leak so it may be ready to fall out...
 
>> You've blown a freeze plug, which are made into most blocks as a
>> "pressure valve" to guard against cracking the block if the coolant
>> freezes.
It's a diesel, you should put in at least one engine heater, maybe 2 (I run
3):
http://Gnarlodious.com/Vanagon/VanagonNotes.html#preheater

 
>>>  While driving my 82 diesel
>>> vanagon, antifreeze started pouring out of the crankcase.
Beg pardon? Coolant coming out of the crankcase? It sounds worse than a
freeze plug!

My cat offers this advice:
aQqqJUU-0ZZZZZZZZZZZZZZZZZZZZZZZZZZZAQB77AAAA77 777777
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That's what I'd do.

-- Gnarlie