The engine would be a Tecumseh-
OVM120-200015

You can find a service manual at the link

Here is a link that might be useful: Link

I checked out that link and didn't find the info I need. the engine is a vector model. thanks for your reply.

Vector keys are installed w/ the tab part down. 35 ft. pounds torque. Tie the zone control down when you slide the flywheel on so it will line up better.

hi toplum, thanks for your reply. should the tab be facing the crankshaft?

YES!!!

The shorter edge fits into the crank.

thanks guys, the info was very useful.