CHANGE TIMING CHAIN

A timing chain is a major component used to keep an engine's timing in sync, and replacing it is often an essential part of automobile maintenance. Timing chains typically last longer than timing belts and are preferred by some automakers for their durability. Most experts recommend replacing a timing chain every 100,000 miles or so. Timing chains might need replacement if there is excessive vibration or if the vehicle's ignition timing seems off.

Typical costs:
Hiring a mechanic to replace a timing chain typically costs $300-$1,000, depending on the make and model of the vehicle, its age and whether the work is performed at a dealership or an independent shop.
Purchased separately, a timing chain typically costs $50-$250 or more. For example, Ford uses a timing chain on its 4.6-liter V-8, which is found in several popular models, including the F-150 pickup. A timing chain for a 2004 F-150 with the 4.6-liter V-8 costs $53 from national retailer.
Timing chains are often sold in kits which contain additional smaller parts that can be used in the repair. Prices for kits vary considerably, from $20 to $1,000,as replacement parts for some original equipment manufacturers simply cost more to build than for others. Some kits might be built using expensive materials, adding to the cost.
Expect to pay $85-$130 per hour for labor, depending on whether the work is performed at a dealership or an independent shop. It depends on the model, but generally the job takes three-five hours. Costs can increase considerably, sometimes up to $700 or more, if the timing chain breaks before being replaced.
Timing-chain failure seldom occurs when the car is still under warranty, so customers will usually have to pay for the replacement themselves. Dealerships typically charge more, but their technicians are intimately familiar with the brand of cars they work on and they use factory parts. Independent repair shops may charge less, but they may use aftermarket parts, which are manufactured to factory specifications, but are not made by the automaker.

What should be included:
A timing chain kit should include the kit itself; any necessary seals, bolts and sprockets, and any other necessary accessories. A mechanic will be expected to remove and replace the chain, along with the aforementioned seals, bolts, sprockets, and accessories.
If possible, it is best to get an estimate before approving any work. However, if the timing chain has failed, the car will not run and this might not be an option.
Additional costs:
The water pump is sometimes replaced along with the timing chain. Normally, water pump replacement is typically about $300; however, since the technician is already replacing the timing chain, labor costs may not be charged, and the customer would only be charged for the part, which is typically about $100-$150.