How to Remove a Crank Pulley Bolt

Written by c.l. rease
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How to Remove a Crank Pulley Bolt
A crank pulley bolt threads into the end of a crank shaft. (cranked shaft image by Sergey Goruppa from

The crank pulley of your engine is designed to remain in place under the heavy loads exerted by your vehicle. In the centre of the crank pulley resides a bolt that threads into the end of the crankshaft. During use, the head of the bolt embeds in the face of the pulley wheel. Breaking the bond created between the bolt head and the pulley requires excessive force. Renting expensive electric or pneumatic impact guns will break the bond and your wallet. Breaking the bond manually with the proper crank bolt removal tool will remove the bolt without causing damage to the engine, crank pulley or motor mounts.

Open the vehicle bonnet. Remove any obstructions blocking your way to the crank pulley bolt.

Match a socket from a 1/2 inch drive socket set to the head of the crank pulley bolt. Push the drive end of the socket onto the socket receiver of a crank bolt removal tool.

Turn the crank bolt removal tool so the arm with the socket attached sits to the left side of the crank pulley. Slide the end of the socket onto the crank pulley bolt. Hold the handle of the tool at a 90 degree angle to the crank pulley bolt.

Hit the handle end of the tool repeatedly with a heavy mallet until the crank pulley bolt spins free of the pulley face.

Remove the crank bolt removal tool from the crank bolt. Turn the bolt by hand to remove it from the end of the crank shaft.

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