[Grady Clay]

The good news it is repairable.

You will want a new pulley. Be sure to get another that is 134 mm diameter for the fan belt. I would also get a new bolt and washer. Check the bolt fit in the crankshaft.

Extracting the remains of the pin is a challenge. There are lots of options. Critical is to not damage the crankshaft - it is softer steel than the pin. The pin is a close ‘slip-fit’ in the crankshaft and an interference ‘press-fit’ in the pulley.

It is useful to fill the space between the seal and crank with heavy grease. You can put a greased thread around the bearing. This will collect any shavings. You will want to install a new seal when finished.

The condition of the pin hole in the crankshaft is critical. With a new pin and new pulley, there should be no rotational (angular) play between the crank and pulley.

If you find play, find TDC of the engine and then align the pulley to Z1. You can drill for a 2nd pin without causing damage. Drill the 2nd pin at about 90° from the original (not 180°). Start small and ream to the proper ‘slip-fit’.

Keep in mind the cost of the best tools and proper procedures pale in comparison to a crankshaft.

Best,
Grady