To drive the belts
I suspect you are talking about the crank pulley delaminating. The crankshaft pulley is a two piece metal affair with a bonded rubber section between the two metal sections which acts as a vibration dampener. Now these cars are getting older the rubber bonding perishes and the pulley separates. I have two friends with GTO's who's pulleys have gone. I recommend replacing the original pulley with a solid billet one, as I have done, that way theres nothing to split!
put the car in drive and crankshaft wont turn anymore. then you can take off the bolt
To remove the crankshaft pulley on an Opel Corsa Utility 1.4, first, ensure the vehicle is securely lifted and supported. Remove the drive belts and any accessories attached to the pulley. Use a suitable socket and breaker bar to loosen the crankshaft pulley bolt, which may require counter-holding the crankshaft with a tool to prevent it from rotating. Once the bolt is removed, you can pull the pulley off the crankshaft, possibly using a puller if it is stubborn.
The Crankshaft Position Sensor is behind the crankshaft pulley (harmonic balancer). You will need a ½-inch drive breaker bar and appropriate socket.
Turn engine with a socket on the front crankshaft pulley.Turn engine with a socket on the front crankshaft pulley.
A lawn tractor drive pulley is connected to the engine crankshaft and transfers power to the transmission. As the engine rotates, the drive pulley spins and drives the belts that are connected to the transmission, allowing the lawn tractor to move forward or backward. By adjusting the position of the drive pulley on the engine shaft, the speed and direction of the lawn tractor can be controlled.
Raise the left front of the van then remove the wheel and the rubber splash shield. Remove the drive belt and the bolt that retains the pulley to the crankshaft next use a puller to remove the pulley. On installing it you need an installer don't hammer on it, I have seen that done and the crank destroyed. Depending on your location parts stores will loan or rent the puller and installer.
Remove the drive belts, crankshaft pulley, and timing covers. Align the timing marks on the camshaft and crankshaft and r+r the belt
Should pull the drive pulley and then you can pop off the old seal with a screw drive and press in the new seal.
It dampens crankshaft vibrations on your main drive pully for the serpentine belt. It's an inner steel wheel bolted to the crankshaft, with a rubber bushing, then the actual crankshaft drive pully on the outside of that. Without it you would likely loose your belt, or wear it out prematurely.
Inside the lower part of the engine. The pistons are connected to the crankshaft by way of connecting rods. The crankshaft is what turns the flywheel, torque converter, transmission, and ultimately the drive wheels. Look of the top of the transmission bellhousing. Sorry, I thought you meant crank sensor. It is that main shaft the runs through the bottom of the engine block from the front to the back of the engine, and is connected to the pistons. You cannot see the crankshaft without taking the engine apart, but you can see the crankshaft pulley, which is the pulley that attaches to the front end of the crankshaft, and drives the serpentine belt, which drives all the accessories, like the alternator, power steering pump, etc. The crankshaft pulley is the very bottom pulley, when you look at the front of the engine.