> Jeff, With the diff on the drill press, yes the swarf fell into the
> casing. We did not destroy or wear out any bits. It was pretty easy.
> We started with a small bit and worked up to the right size simply to
> get the position correct and see how hard it was. Theoretically when
> even when drilling up into the bottom when drill breaks though then
> some amount must fly off. I suppose the distance will be limited by
> the old gear oil (messy when it runs down the drill bits) and the fact
> that that section is somewhat recessed when you look from the inside.
> Plus as you say the oil will drain out with the swarf in it. Also a
> flush with new oil should help wash most of what's left out, plus the
> oil and crud of many years. My concern about drilling by hand would
> be how straight the hole was for tapping afterwards. That was the main
> reason for using the drill press. Although a good washer on the plug
> is probably the main seal on the threads anyway as gravity will always
> have the oil trying to come out that way all the time. At least there
> is no pressure in the oil like there is in the engine. My other reason
> for doing it was I wanted to put new mounting bushings and split the
> diff as the seal was leaking and it gave me a real chance to check and
> flush the original oil out. The chance to add the plug was in fact a
> bonus.
>
>
> Jeff McNeal wrote:
>
>> Alan,
>>
>> How many bits did you go through? And wouldn't the swarf be dropping
>> down to
>> the floor and not be pushed into the diff casing? I would think that
>> the
>> ensuing draining of oil would force any swarf that might have made it
>> inside
>> the casing out, and the magnetic plug I'd insert would take care of any
>> remaining flecks. Is my reasoning flawed on this count?
>>
>> Thanks for the reply.
>>
>> Best wishes,
>>
>> Jeff
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