Show whole topic May 15, 2019 9:22 am
h14 Offline
Member
Registered since: Nov 30, 2008
Location: Chalandray, France


Subject: Re: Smiths rev counter drive off of Rotax AT146 dynamo?
Hi Ted,
You need a pin spanner/wrench for that. You might get away with using a hammer and punch, provided you accept there's a fair possibility of damage to that "plug". That said, if you are replacing the plug with a rev counter drive, damage to the plug is less of a concern. A suitable pin spanner could be made fairly easily with basic equipment. Find four screws that fit snugly in the holes in the plug, make a template accurately transferring the hole position in the plug. Then find a suitable piece of steel of adequate thickness and length, drill and tap for those screws, using your template to accurately match the plug hole positions, screw the screws in so that they protrude slightly more than the depth of the holes in the plug ... and voila! You have your pin spanner. It's not something you are likely to be able to buy ready made. All this said, if it's really tight, bearing in mind it has probably never been undone since 1930 odd, you might need to at least get it started with that hammer and punch.
Laurence