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fan
 

The way I do it.

Remove the backplate from the engine. I use a hardwood dowel cut in half. I place this dowel to where it comes in contact with the con-rod and side of engine case. Hold the fan with a towel and rotate counter clock-wise. The dowel will stop the engine from rotating and allow you to really get a good twist

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It screws off. I use a piston lock to prevent the engine from turning. It is a nylon bolt of about 5cm that screws in through the glow plug hole. Make sure the crankshaft is in the 90 degree position, otherwise there will be very large forces on the crankshaft and piston lock during the procedure.