Hi Paul- I'm not nearly as long winded as you are. No disrespect, I enjoy
reading your posts. Here's how you fix it:
1) Take the block (or head, manifold, or other) to a reputable machinist.
2) Have them MILL it out (no flex in the milling tool)
3) Install a helicoil or rethread to the larger size.
If the engine is in the truck, there's no hope until you get it milled.
Any other effort would likely do more damage than good. Good luck, and
don't complain too badly about the weather, as it snowed here today for the
first time this season.
Don
'55 2nd DeLuxe
At 09:44 PM 9/27/99 EDT, Hudson29@aol.com wrote:
> September in SoCal is often one of our two most miserable months, and I
>never count on doing outdoor daytime activities this time of year. This
>summer has been the most comfortable I can ever recall, and this weekend was
>no exception. The high was only 74 degrees F, and a cool Spring breeze
sprung
>up to make an absolutely splendid day.
>
> Over this weekend I pitched into cleaning up the old 235 in preparation
>for painting and reassembly. Among the chores was chasing some of the
threads
>in the castings with a tap. I like this kind of work. You really get a sense
>of progress as the surfaces come clean and the new treaded fasteners turn
>easily in their holes.
>
> Some of these hole were filled with broken bolts. My old drill set
seemed
>fine for wood and plastic, but proved hopeless on these steel bolt remnants
>so a new set of Vermont American "Titanium" drill bits was purchased to
>replace the old ones that I suspect were made of something like silly putty.
>Several folks had recommended "Cobalt" drills, but the place I was shopping
>in sold these individually, not as a set, so I settled for the Titanium ones.
>
> These new drills worked a treat on the small 1/4" stuff, and when I came
>to the last hole, I thought I was home free. That last hole proved to be
more
>than a match for me this Sunday, however. The hole is 5/16 course, one of
the
>four large fasteners that hold the oil pan in place. The broken bolt is
>forward on the cam side. The motor is mounted on a stand, and is rotated
>belly up so the pan area is easy to get at.
>
> This particular bolt is broken off about 1/4" into the hole, and sheared
>so steeply that it is impossible to get a drill started. I have a center
>punch that had worked well with the other bolts but wouldn't touch this. I
>tried drilling in at an angle, but the drill just did not find a purchase.
>Someone else had tried drilling out the bolt in the past and had got mostly
>the cast iron that the bolt threaded into. The thing is a real buggered up
>mess and had been hidden by a dab of black silicone.
>
> Has anybody got any suggestions on what to do with it now? This is the
>last broken bolt in the motor, and when it's out we can move on to other
>things.
>
>Paul O'Neil, Hudson29@aol.com
>1951 Chevrolet 3600 Pickup Project, See it at:
>The Poor Man's Advanced Design Tech Tips Page
>http://home.earthlink.net/~conntest47/
>Fullerton, California USA
>AEROMARK - Need Rubber Stamps or Signs? See:
>www.aeromark.net
>oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
>
>
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