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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
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.
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.
In automotive terms, There are drive pulleys such as the drive pulley mounted to the crankshaft on most engines. There are driven pulleys such as an alternator, power steering, water pump, a/c compressor and all the accessories driven by the drive pulley. There are idler pulleys and tensioner pulleys. There are timing belt pulleys. And for non automotive related terms, There are block and tackle pulley systems. There are pulley hoists. Wire rope pulley blocks. Cable pulleys. Rope pulleys.
the crank sensor is located behind the main accessory drive pulley which is installed at the end of the crankshaft you have to remove the pulley and the plastic cover that covers the timing belt