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A timing belt is a toothed rubber belt that keeps the valves and pistons in step, and it usually gives no warning before it breaks. Route 66 Auto Repair in Upland replaces timing belts at the interval your manufacturer lists, by miles or years, whichever comes first. On interference engines a snapped belt can bend valves, so this is maintenance worth scheduling. ASE-certified technicians list the tensioner, idler pulleys and a belt-driven water pump as options on your written estimate.
When should a timing belt be replaced?
- At the mileage or age in your owner's manual, whichever arrives first
- When you buy a used car with no record of the belt being done
- When oil or coolant has contaminated the belt
- When cracks, missing teeth or glazing show at inspection
What is an interference engine, and why does it matter?
In an interference engine, the valves and pistons share space at different moments. The belt keeps them from meeting. If the belt snaps, the pistons can strike open valves and bend them, which turns a maintenance job into cylinder head repair. Non-interference engines usually just stop running. We can tell you which design your engine uses at intake.
Many engines use the timing belt to drive the water pump. Since the pump is behind the same covers, we list it as an option so you are not paying that labor twice.
Our timing belt replacement process
Step 1: Look up the spec
We confirm the belt routing, tensioning method and interval for your engine.
Step 2: Set and lock
The engine is set to its timing reference and cams are locked where tools exist.
Step 3: Replace parts
Belt, tensioner and idlers go on, plus the water pump if you approved it.
Step 4: Rotate and check
The engine is turned by hand twice and marks are verified before covers go back on.
Step 5: Start and test
We check for leaks and noise and road-test the vehicle.
What's included in a timing belt replacement
Included on the work order
- 01New timing belt matched to your engine
- 02Tensioner and idler pulleys as quoted
- 03Water pump and coolant as an option on belt-driven pumps
- 04Cam and crank seal inspection for leaks
- 05Hand rotation and timing mark verification
- 06Service sticker with the date and mileage
Need-now or need-later?
Need now: call
- Belt past its interval on an interference engine
- Oil-soaked or cracked belt found at inspection
Need later: book
- Belt approaching its interval with good condition
- Accessory belts that can be done at the same visit or later
How pricing and timing work
Engine layout drives labor. Transverse V6 engines take longer than inline fours, and some engines require an engine mount to come out. Adding the water pump adds parts but little extra labor. Every option is a separate line on the written estimate. AAA members get 10% off parts and labor, up to $75, with the card at time of service. Most belt jobs take a day when the board allows.
Aftercare
Record the date and mileage for the next interval. If you notice a coolant drip or a new whine, come back. Oil leaks near the belt covers are covered on the camshaft seal replacement page, and the pulleys are covered by tensioner pulley repair. The Car Care Council (opens in a new tab) also publishes general belt interval guidance.
Frequently asked questions
When should a timing belt be replaced?
Follow the interval in your owner's manual, which lists both miles and years. Replace it at whichever comes first. If you do not know when it was last done, treat it as due.
Should I replace the water pump with the timing belt?
If the pump is driven by the timing belt, it is often sensible, because the labor overlaps. If the pump is driven by the accessory belt, there is less reason to pair them. The estimate shows both choices.
What happens if the timing belt breaks while driving?
The engine stops immediately. On an interference engine, valves can bend and the repair becomes much larger. We accept tow-ins and will check for valve damage before quoting.