[AT] internal block repair

[Cecil Bearden]

If the structural soundness is not really necessary, I would recommend 
just using JB weld or Belzona or Devcon.  In a vertical repair, JB weld 
will run.  You could tape some cardboard below the crack if it is 
horizontal to create a channel for the JB weld to sit in until it is 
set...  Then grind off what is not necessary with a dremel grinder or 
something larger.

I say this because I have tried to repair blocks near oil galleries and 
just had the crack expand into the gallery..  Heating really can mess 
things up unless you take the entire block apart and heat it evenly.  I 
have done this on 2cyl blocks and on large truck rear end castings.  I 
heated and welded the part while it sat on a turkey fryer burner.  I let 
it get warm to about 300 deg, then brazed it with carbon arc and brass 
rod... This is a job best done outside in the winter...

The truck rear end I welded is still in daily service after 22 years!!!! 
  I even welded up the pinion cage!!!

Cecil in OKla

charliehill wrote:
> I'm not so sure you couldn't solder that up.  Heat the casting with a torch, 
> flux it and flow some silver solder into the crack.  That's just a thought. 
> I never tried it.
> 
> Charlie
> ----- Original Message ----- 
> From: "Steve W." <falcon at telenet.net>
> To: "Antique tractor email discussion group" <at at lists.antique-tractor.com>
> Sent: Thursday, January 01, 2009 9:04 AM
> Subject: Re: [AT] internal block repair
> 
> 
>> John Hall wrote:
>>>  Trying to fix an oil leak on a Farmall Cub. In years past the block was
>>> broken at the front right lower corner (not too uncommon depending on the
>>> owners). The block was welded on the outside and where the pan bolts 
>>> up---no
>>> welding on the inside. Now the weld has cracked where the pan lays so oil
>>> gets inside the crack from inside the motor, runs down to the gasket and
>>> then leaks to the outside. I am thinking of cleaning the inside with carb
>>> cleaner and applying some JB Weld or Belzona to the crack. Then I am 
>>> going
>>> to coat the area with Glyptal. Then we will reinstall the pan using black
>>> oil resistant silicone on the gasket. Other than pulling the engine and
>>> re-welding the block (which is not an option for this Cubs owner) anybody
>>> got any other ideas/suggestions?
>>>
>>> Happy New Year!
>>>
>>> John Hall
>>>
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>>>
>>>
>> If you can get in there how about brazing over the crack? You will want
>> to use some heat there anyway to bake the oil out of the cast or the JB
>> won't stick. Brazing would also help structurally.
>>
>> -- 
>> Steve W.
>> Near Cooperstown, New York
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