Crankshaft Pulley replacement & repair made easy

How does a crankshaft pulley work?

The crankshaft pulley is an important part of your engine that helps drive key components like the alternator, power steering pump, and air conditioning. It’s attached to the front of the crankshaft and works with the auxiliary (serpentine) belt to keep these systems running smoothly.

There are two main types:
* A standard crankshaft pulley is usually made from solid steel or cast iron. It’s strong, low-maintenance, and rarely needs replacing.
* A crankshaft damper pulley (also called a harmonic balancer) includes a rubber insert that absorbs engine vibrations. This helps protect the crankshaft from stress and potential damage over time.

Both types are essential for ensuring your engine runs efficiently and your vehicle’s systems stay powered. If the pulley becomes worn, damaged, or the rubber insert begins to crack, it can lead to belt problems, strange noises, or even long term engine performance issues — which is why repair or replacement is important in this case.

What does a crankshaft pulley replacement involve?

Replacing a crankshaft pulley is a detailed job that ensures your engine and its connected systems run smoothly again. Here’s what a mechanic typically does:
* The car is lifted using a jack or ramp to safely access the crankshaft area.
* The mechanic checks the pulley for wear, cracks, or damage, and confirms whether a replacement is needed.
* If faulty, the old crankshaft pulley is carefully removed. This may require special tools, especially if it’s a damper-style pulley.
* A new, compatible crankshaft pulley is fitted in place, ensuring it’s aligned and torqued to spec.
* The mechanic inspects related parts like the auxiliary belt, tensioners, and crankshaft bolt to make sure everything is in good working order.
* Once everything is reassembled, the mechanic may perform a quick engine run or test drive to check for any unusual noises or vibrations.

This process helps ensure your engine accessories — like the alternator and power steering — continue working properly.

How do I know if I need a crankshaft pulley repair or replacement?

Here are some common signs to watch for:
* Unusual engine noises – Rattling, knocking, or scraping sounds from the engine bay may point to a loose or failing pulley.
* Louder noise when accelerating – If you hear an increasing noise as you press the accelerator, the pulley may be worn or out of balance.
* Excessive engine vibration – One of the pulley’s jobs is to absorb engine vibrations. If your car feels unusually shaky, especially at idle or under load, the pulley could be the cause.

If you’re experiencing any of these issues, it’s a good idea to have a mechanic inspect the crankshaft pulley

Can a crankshaft pulley be repaired?

While it’s sometimes possible to repair a crankshaft pulley — for example, if there’s a loose bolt or minor surface damage — replacement is usually the safest and most reliable option.

This is especially true if the pulley includes a harmonic damper (a rubber insert that absorbs engine vibrations). Once that rubber element is worn, cracked, or separating, it can’t be repaired effectively. Driving with a failing pulley can lead to increased engine vibrations, strange noises, belt misalignment, or even engine stalling.

Because the crankshaft pulley plays a vital role in both engine performance and longevity, replacing it with a new, manufacturer-approved part is the best way to avoid more serious problems!

What crankshaft pulley removal tool do mechanics use?

Most common is a 3-jaw harmonic balancer puller, which uses adjustable arms to grip the pulley evenly and pull it away without harming surrounding parts. It’s widely used on vehicles from Ford, GM, Chrysler, and many others.

When the pulley bolt is tightly torqued, a crankshaft pulley holding tool is used to lock the pulley in place, preventing it from spinning while the bolt is loosened or tightened.

On engines with limited access, a flywheel locking tool might be used to secure the crankshaft from the other end.

These tools are essential for removing the pulley without damaging the crankshaft or engine components. Remember, DIY removal is tricky and not recommended — crankshaft pulleys are often under high tension, and improper removal can lead to serious damage. It’s always best to have the job done by a qualified mechanic with the right tools and expertise!

How much does a crankshaft pulley replacement cost?

The cost of replacing a crankshaft pulley typically ranges from £190 to £350, depending on your car’s make and model, location and the type of pulley.

Labour is a significant part of the cost, as accessing the pulley can be time-consuming for a mechanics, especially on vehicles where it’s tucked behind other components. The part itself can also vary in price, with damper pulleys being more expensive than standard solid pulleys.

What does a ClickMechanic crankshaft pulley replacement quote cover?

Unless otherwise stated, the quote for your crankshaft pulley to be replaced will cover:
* The cost of the pulley
* Coming to you
* Fitting of the parts
* Disposal of the old parts (unless you request to keep them)
* VAT (if applicable)
* 12 months parts and labour warranty

Can a mobile mechanic replace the crankshaft pulley?

Yes, in many cases a mobile mechanic can replace the crankshaft pulley at your home or workplace, especially if the pulley is easily accessible and the job doesn’t require major disassembly.

However, some vehicles may have limited engine bay access or require additional tools, which means the job might need to be done in a garage setting. If your vehicle can be driven, we offer free collection and delivery to carry out the repair at a garage for a fee (if not driveable).