Q: The serpentine belt is not lining up.

asked by on February 18, 2017

I had the belt replace in a garage about a month ago because it was slipping off and it fell off again about a week ago. I found out that the belt tensioner was busted. I replaced the tensioner now it is not lining up. it keeps slipping off the crank shaft and sliding off the idler pulley but not completely off.

Serpentine/Drive Belt Replacement $95.44 - $301.27 Get a Quote

The pulleys may not be lined up in the same plane. Look at the harmonic balancer and crank pulley in particular. The rubber bond in the balancer may have failed thus causing misalignment of the pulleys relative to the other pulleys. The other issue is be sure you have the correct replacement belt and the correct tensioner.


If you request serpentine belt inspection/replacement a certified Mechanic, dispatched by YourMechanic right to your location, will get the belt issue resolved for you promptly and the mechanic will of course let you know if you need a new harmonic balancer/crank pulley. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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

What others are asking

swap a newer year engine Into my 2001 ford ranger 4x4 4.0l sohc

Unfortunately Your Mechanic does not perform engine replacements or engine swaps. Since it's not something we normally do, it would be difficult to provide you with the answer as to what may need to be modified or replaced in your...

Can my camshaft position sensor cause my stabilitrak to have issues?

Hi there. P0449 is a general OBD2 diagnostic trouble code indicating an issue with the EVAP vent control circuit, so it has nothing to do with exhaust. I would recommend reading this article to learn more about the causes of...

Hi my water tank has been leaking for a few days while i wait for the parts to come in .

Has the engine been run while overheating to the point where the engine shut off? The engine power is reduced warning message has come on because the vehicles computer picked up a problem in the control system. There may be...

The brake pedal is low and hard to press, and my car does not brake well

It sounds like the brake booster is failing. The hissing sound you heard was air leaking through either a vacuum or vent valve in the brake booster itself. The valve failure prevents the booster from generating brake boost, making the...

How do the seat belts work?

Seat belts, also called safety belts, are vital components for the safety of the driver and passengers alike. The purpose of the seat belts is simple. If the vehicle is in an accident, there are extreme forces involved trying to...

How do I customize the Delayed Door Lock?

When the Delayed Door Lock feature is on and you press the lock button when one of the doors is open, the locks will wait until all the doors are closed, delay for a few seconds, and then lock. Turning...

Car is idling high, revving at RPMs higher than 2700

Hello. When this car idles high like this it is because there is a vacuum leak. A vacuum leak will allow too much air to enter the engine causing it to idle too high. The most common place is at...

Installed new delphi fuel pump and fram fuel filter. still no pressure on fuel rail valve and wont start. 2003 Chevrolet Tahoe

Hi there - I suspect you have weak power getting to the fuel pump. I would first check the voltage coming out of the fuel pump relay. If the contacts in the relay are burned, you will not get reliable...

I replaced the thermostat in my car but it still gets hot and the coolant keeps evaporating the fan kicks on I see no leaks what c

Claimed by Jeff Engstrom

Related articles

A Buyer’s Guide to the 2012 Chevrolet Colorado
The The 2012 Chevrolet Colorado is the perfect size pickup for running errands on the weekend and doing light duty chores around the yard. For those who don’t need a full size pickup, the Colorado offers almost everything a full...
Why Serpentine Belt Replacements on Cars With Limited Clearance Can Be Tricky
Changing a serpentine belt is a service that can involve performing some difficult maneuvers on the engine, especially on cars with limited clearance.
How Belt Pulleys Work
There There are two main types of car pulleys: crank pulleys, and accessory pulleys. Most pulleys are driven by a main crank pulley, which is bolted onto the crankshaft. When the engine is operating, the crank pulley rotates, transferring motion...