Skip the auto shop - Our mechanics make house calls

Q: crankshaft pulley harmonic dampener fell off after serpentine belt replacement

asked by on

A couple of weeks after replacing a broken Alt/AC Belt, the outer toothed-ring on the CS pulley fell off while starting and/or driving car. Does this typically happen with new belt?? Does anything hold the ring in place other than the rubber ring on the pulley, or can the ring be reused?? Do I need a gear-puller to remove the pulley, and is this a very difficult job?

My car has 115000 miles.
My car has an automatic transmission.

It could be that the condition of the pulley caused your belt failure in the first place. Deciding that depends on where the balancer separated.The balancer itself consists of a center hub with a pulley ring around it and a bonded rubber ring between the two. Depending on the model of car, additional pulleys may be bolted to the outer ring to accommodate more belts If the balancer separated at the rubber ring which is simply held in by adhesive, the whole thing must be replaced, and may actually have been the cause of your belt failure to begin with. If the pulley separated where it bolts together, I could not help but wonder if the pulley was disassembled and the bolts not properly tightened. Careful inspection of the parts should tell the story. If you try to replace the balancer, you may be able to do it without a gear puller, but removing the bolt in the end of the crankshaft is the big challenge. It is very large and very tight and keeping the engine from turning while you try to loosen the bolt can frustrate the most capable mechanics who don’t have the special tools made for that job. Likewise, if the bolt is not properly torqued when assembled, it could lead to bigger problems than you have now. By contacting Your Mechanic you can have a technician come to your home and take care of this difficult job for you.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  • Home
  • Questions
  • crankshaft pulley harmonic dampener fell off after serpentine belt replacement

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Bought my aunt's car and put new battery in it. There are no lights at all and the drive belt is not even around the alternator.

Hi there. Check the battery cables and make sure that they are tight. Then check all of the grounds from the battery to the starter and make sure that they are all tight. A loose ground cable will cause the...

Q: Splash guard on the undercarriage drags on the ground

I have the same car and the front end is lower than most parking stops. The parking stops will catch the undercarriage and break it loose. The only way to stop this from happening is to not pull all the...

Q: Convertible top is stuck open - 2001 Mercedes Benz SLK320

Hello. Most of the time this is caused by the lift motor failing. The motor will lose its ability to lift the top, which will cause all of these symptoms. It can also be an electrical issue, but this is...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...