What are the signs of a timing belt going bad?

Often there are none. Wikipedia's entry on timing belts says a belt gives no warning before it fails. SoFi lists ticking, shaking, lost power and hard starts as signs to watch. By the time you notice those, the belt is past due. Go by the miles and the age in your owner's manual instead.

Can you drive with a bad timing belt?

Not for long, and not far. If the belt slips or snaps, the engine stops at once. On an interference engine the valves can hit the pistons, and SoFi puts that repair at $3,000 to $5,000. If a belt is overdue, book it before the next long drive.

Is it worth getting a timing belt replacement?

On a car you plan to keep, yes. A planned belt job runs about $918 to $1,338 nationally, per RepairPal. A snapped belt on an interference engine can cost several times that, per SoFi. On a car worth less than the repair, ask the mechanic first. Temecula Mobile Mechanic says when a car is not worth the work.

What is the average life of a timing belt?

Many last 60,000 to 100,000 miles, per SoFi and Kelley Blue Book. Some last longer, and some cars use a chain instead. Heat and oil leaks wear rubber faster, per Wikipedia. In Temecula Valley summers, go by the low end of the range.

Does a timing chain ever need to be replaced?

It is meant to last, and Kelley Blue Book says a chain can last the life of the car. But Wikipedia notes that poor oiling or a failed tensioner or guide can wear one out early. A rattle from the front of the engine on a cold start is the sign. Temecula Mobile Mechanic sees it most on some direct injection four cylinders and older Audi, Volkswagen and BMW engines.

How long does a timing belt job take?

SoFi puts the labor at 3 to 5 hours. At Temecula Mobile Mechanic, timing jobs are garage work and usually take two to four days, since parts are part of the wait. The shop diagnoses at your car, then tows it in.

Timing Belt vs Chain Jobs Run $900 to $2,400 in Temecula

Belt or Chain Decides the Bill

Two cars can both need a timing job and get quotes $1,500 apart. The first thing that sets the price is whether the engine runs a belt or a chain.

RepairPal puts the national average for a timing belt at $918 to $1,338, on its timing belt estimate page. The labor is $603 to $885 of that. For a chain, its timing chain estimate page says $2,120 to $2,764, and labor alone is $1,334 to $1,957. Both pages say the numbers leave out tax and are not set for your area.

Kelley Blue Book is lower, at $367 to $585 for a belt on its timing belt price page, but it does not say what that covers. SoFi says $800 to $1,300 when the belt is replaced before it breaks, in its timing belt cost guide.

In the Temecula Valley, Temecula Mobile Mechanic publishes $900 to $2,400 for timing chain or belt service on its prices page. That price covers the chain or belt, guides, tensioner and pump as one job. The chart puts every range on one line.

Parts and labor together, before tax. Ranges from the Temecula Mobile Mechanic prices page and the guides listed at the bottom of this page. Kelley Blue Book does not say what its range includes.

Look at the last bar. A planned job costs a fraction of what a snapped belt can cost. That gap is the reason a timing job is worth booking on time.

Valley Heat and the Belt Schedule

A belt has a mileage interval, and your owner's manual sets it. Kelley Blue Book says some car makers call for a new belt between 60,000 and 100,000 miles, and others set no interval at all. SoFi gives the same 60,000 to 100,000 mile range.

Heat is why Temecula drivers should lean early. Wikipedia's timing belt entry says rubber breaks down faster with high heat and with motor oil on it. Coolant on the belt also wears the cords inside. A belt that spends its summers under a hood in a 97°F valley ages faster than the same belt on the coast.

So check two things before you trust the interval. Is there an oil or coolant leak near the front of the engine? And has the car spent its life in the heat? A yes to either one is a reason to replace the belt at the low end of the range.

Not sure if your car has a belt or a chain? The owner's manual tells you. If the maintenance schedule lists a timing belt at a set mileage, it has a belt. If the manual is gone, a phone call with the year, make and model settles it in a minute.

A Chain Lasts, Until It Rattles

A chain is supposed to outlive the car. Kelley Blue Book says it can last the life of the car and may outlast the engine. Wikipedia says chains were adopted to end the belt schedule.

They do not always make it. Poor oiling or a failed tensioner or guide can wear a chain out early, per Wikipedia. A worn chain makes a rattle from the front of the engine.

Temecula Mobile Mechanic says a rattle on a cold start that quiets after a few seconds is a chain guide or tensioner giving warning, on its engine and timing page. The shop sees it most on some direct injection four cylinders and older Audi, Volkswagen and BMW engines. Ignore it, and the chain can jump a tooth. On most engines today, that means the valves meet the pistons.

A cam and crank correlation code can point the same way. A diagnosis with Temecula Mobile Mechanic runs $95 to $150, and the fee comes off the repair if the shop does the work.

Camshaft position sensor mounting bore on a cylinder head with the sensor removed in Murrieta, California — A cam sensor bore with the sensor out, on a Murrieta job. A correlation code is worth testing, since the sensor is often fine and the timing is not.

Timing Belt vs Timing Chain, Side by Side

The table lines the two up. Prices are national averages from RepairPal and the valley range from the shop's own list.

Detail	Timing Belt	Timing Chain
What it is	A toothed rubber belt behind a cover	A metal chain inside the engine, oiled by the engine oil
When it gets replaced	On a schedule, often 60,000 to 100,000 miles	When it wears, stretches or rattles
Warning before it fails	Usually none	A rattle from the front of the engine, worst on a cold start
National average, parts and labor	$918 to $1,338, per RepairPal	$2,120 to $2,764, per RepairPal
What goes with it	Tensioner, idlers, and the water pump when the belt drives it	Guides, tensioner, seals, and the pump when it sits behind the cover
Temecula Valley	$900 to $2,400, per the shop's price list	$900 to $2,400, per the shop's price list

The two jobs share a price range at Temecula Mobile Mechanic because access sets the labor, per the shop's price notes. Where the cover sits and what has to come off first moves the number more than which part is behind it.

Do the Water Pump at the Same Time

On many engines the timing belt turns the water pump. Wikipedia says a new pump with the belt is often recommended, since the pump is easy to reach then. It also warns that a pump that seizes can break the belt. That is why belts are often sold in kits with the pump, tensioner and idlers.

The math backs it. SoFi says a pump adds about $100 when the belt is already off. On its own, RepairPal puts a water pump job at $891 to $1,135. Temecula Mobile Mechanic lists a pump at $350 to $1,200, and notes a chain driven pump is a timing job.

RepairPal says the same for chains. With the timing cover off, it suggests a new water pump and front seals too, since doing them later means paying the labor again. See the shop's cooling system page for pump and radiator work.

Close inspection of idler and tensioner pulleys on an engine accessory drive in Menifee, California — The outside belt, not the timing belt. Tensioner and idler checks on a Menifee job. The timing belt hides behind a cover, which is why it costs more to reach.

What a Snapped Belt Costs

A belt rarely gives warning. Wikipedia says belts show no sign before they fail. Stripped teeth are a more common failure than a clean break, per the same entry.

What happens next depends on the engine. Wikipedia says many modern cars use interference engines, where the valves can hit the pistons when the timing is lost. SoFi puts that damage at $3,000 to $5,000, and says it can cost more than the car is worth.

Temecula Mobile Mechanic puts it plainly. On interference engines, which is most of them now, there is no gentle way for a timing job to fail. At that point the talk is about an engine, not a belt. The shop says when a car is not worth an engine, before you spend anything.

Six Questions for Any Timing Quote

Screenshot these. They work on any shop, dealer or mobile mechanic.

Is this a belt or a chain on my engine?
Does the price include the tensioner, idlers and guides?
Is the water pump included, and is it driven by the timing belt?
Are the front seals included while the cover is off?
How many days will the car be gone?
Does the warranty cover labor, and for how long?

That last one matters. The Federal Trade Commission says many part makers cover the part but not the labor to put it in, in its auto repair basics. Temecula Mobile Mechanic puts a 3 year warranty on parts and labor for every repair.

California law helps too. No shop can start until you approve the work, and the final invoice must list every part, per the Bureau of Automotive Repair. If you want the old belt or chain back, say so before you approve the job.

Get a Firm Number

Timing jobs at Temecula Mobile Mechanic start with a diagnosis at your car. If you go ahead, the car is towed to the shop's garage and usually comes back in two to four days. Book a visit or call (951) 618-1982.