[Nobbc] Need advice

[gtwincams]

Hi Rich,

Professionals usually have cool tricks they use, so maybe Dennis and/or 
Robin will have some comments.

I didn't recommend the multi-spline type for the reason you noted - it 
acts as a reamer on the soft brass. If this were my problem, I would 
avoid drilling out the fitting, but would instead tap threads into it, 
thread a bolt with permanent locktite into the new hole in the brass 
fitting, and after it set up, try to extract it in that manner.

Why would I not drill and tap? at least three reasons; 1) because 
drilling will create many small slivers of brass which will work 
directly into your oil galleries, while threading, because of the slower 
speed, might make control of the chips easier, 2) drilling squarely and 
concentrically is difficult, and you might bite to far into the iron, 
and 3), it would be best not to enlarge the hole in the block for the 
oil switch.

In addition to your idea of removing the dizzy (presumably to vacuum out 
brass chips) I would also remove the oil pressure relief valve from 
directly beneath the oil switch hole, as well as the oil filter or 
filter adaptor. While tapping, I would have a shop vac nozzle mounted to 
the oil relief valve hole in an attempt to suck out chips, and I would 
use the vac to try to draw chips from the oil gallery hole in the filter 
boss.

If this doesn't work, you can always fall back on your plan, but you may 
well find that you could drill the brass until it just gets thin, 
without touching the iron threads, and it will loosen up enough to allow 
it to be worked out with a dental tool or small pick.

The good news is that the path the oil takes under pressure is from the 
pump, to the relief valve and oil switch, then to the oil filter, so it 
is possible the brass chips will be captured by the filter before being 
shot into your bearings at 70 psi., which would be a nice thing to avoid.

Cheers,
Greg



rlmossholder at comcast.net wrote:
> Hi,
> Thanks for the great advice guys. The easy-out that sheered off in the fitting was a reverse thread screw type made by Black & Decker (probably a Chinese special).  I also tried one of the spline types made by Snap-on. The Snap-on tool was not effective either. The brass would just chip away. I think my only option left will be to remove the distributor,  drill out the fitting and re-tap the hole. Of course I will have to flush out the chips and give her an oil change, but I think that is going to be my best option. Any further ideas would be greatly appreciated.
> Thanks,
> Rich M
> _______________________________________________
> Nobbc mailing list
> Nobbc at autox.team.net
> http://autox.team.net/mailman/listinfo/nobbc