[AT] JD 318 head bolts

[Steve W.]

Removing a broken drill or tap in nonferrus metals (brass - aluminum,etc.)

At most any grocery store, buy a box of alum. Select a glass or ceramic
container (made for stove top use) or an aluminum pot large enough to 
place your
part in so it can be submerged in water.

Remove the part and bring the water up to just below the boiling point 
of the water.

Add alum until no more will disolve, then place your part in the 
solution. Keep the solution
at a simmer and you will soon observe a trail of tiny bubbles coming 
from the broken
drill/tap. Keep the solution at a simmer and add water as needed as long 
as the trail of
bubbles continue.

When the bubbles stop, remove the part and let cool for inspection. You 
should discover
that the steel drill or tap has turned to a rusty mud which is easily 
removed
from the hole.


> 
> I have a JD 318, and was trying to remove the heads so I could grind or lap
> the valves.  In the process of removing the heads, 4 of the 5/16 inch head
> bolts snapped in the aluminum block. The problem is that there is some
> corrosion at the bottem end of the head bolts, so removing tries to take the
> rusted ends of the bolts though all of the threads. One bolt that was tight
> did come out, but it appeared that it may have galled threads in the block
> as it came out.
>   Does anyone have any good ideas other than re-power or a block change.
>    
>   Thanks,
>   Dennis
>    


-- 
Steve W.
Firefighter,EMT
VanHornesville Vol. Fire Dept