Next message: Lew Hodgett: "Re: lv-ab: removing rusty exhaust manifold bolts"
wrote:
> I broke off the head of a cap screw which holds the water pump tensioner
> pulley on my CAT 3116. The bolt for the adjusting arm came out OK, but the
> other one broke off flush. I know the fix involves drilling out the broken
> piece, and either removing it with a screw extractor, or tapping new
> threads. I tried drilling, without much success. Does anyone have
> suggestions on what type of bit to use, or any other tips? Removing the
> part and drilling on a drill press is not an option.
Sometimes you can get a pilot hole started by using what I know as a
centering drill.
It is a drill with perhaps a 1/2" body with a short drill point
extension, say 3/8" max. The drill point is maybe 1/8-3/16 dia.
Definitely an industrial, not a DIY item.
Lew
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