Re: Big Twin 35 gear case to oil retainer dowel.

[frankr]

You confused us with an incomplete part number. Should be 300611, and it is not the same as the impeller drive pin. I’ve never tried chinewalkers approach, but I have drilled out similar dowels in other locations, using your approach. The tricky part is keeping the drill from walking out into the softer aluminum. Best to use a drill press and start with a smaller hole if you have the equipment.

Another approach is to simply drill a new hole beside the original. It’s only purpose is to prevent the seal housing from blowing out of the case.