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DIY Crank Shaft Pulley
Introduction


If your car is making a squealing sound and you have checked all of the belts, then there is a good chance that either your AC Idler pulley bearings are gone, or your crank pulley is going bad and starting to separate. It is easy to determine which one it is. Just pull off the AC belt and then drive the car around. If the squealing didn't go away, it's the crank pulley.

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The crank pulley also acts as an engine dampner. This is accomplished by the rubber in between the pulley. Once the rubber wears out, the two metal pieces start to move independently. This is where the squealing comes from.

It's very important to change the pulley as soon as it starts making noise because if the pulley separates, you will lose all of the belts and possible damage your oil pump cover.

Overall this job is not that technically difficult to accomplish. However, you do need rather small arms and one special socket.


Here is a list of the parts and tools you will need to complete this job.

Required Parts:
  • Crank Pulley
  • Belts
  • Oil Pump O-Ring
  • Front Crankshaft Seal
  • Optional Replacement Parts:
  • Alternator Bushings
  • Alternator
  • AC Idler Pulley
  • Waterpump
  • Heater Core Hoses
  • Required Tools:
  • 10,12,13,17 mm wrenches and sockets
  • 30mm socket - Cut to fit
  • T45 socket for some AC compressor bolts
  • two-three cold beers

  • Replacing the AC Idler pulley is cheap insurance. When the bearings go, the pulley makes a loud squealing noise.

    If your alternator shakes when the engine runs, you may want to buy some new bushings for it as well. Stick with the rubber as the poly ones haven't proved reliable.

    If you can move the waterpump pulley side to side, then your bearings are wearing out and it's just a matter of time before it fails. If you've put over 100,000 miles, then it is a good idea to replace it. I've had the waterpump fail on me twice, dumping coolant all over the road.



    Before attempting this job, it makes sense to buy a new 30mm socket and cut it down ahead of time. Otherwise you will not be able to get a ratchet on the socket. I used a small dremel to cut the socket. You only need about 1/2" of depth to go over the crank pulley bolt.

    cut socket

    Socket


    From this point you should be able to do the job somewhat easily and save yourself about $200 in labor charges.

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