How To Tell If Timing Belt Is Broken?

Yes, there are several clear signs that your timing belt is broken or on the verge of breaking. The timing belt is what keeps the camshaft and crankshaft turning in perfect synchronization, so a broken belt will prevent the engine from running properly or turning over at all.

This article covers how to spot key indicators of a broken timing belt, like the engine not cranking, misfiring, strange noises, and oil leaks. We’ll discuss how to thoroughly inspect your timing belt, looking for fraying, lack of tension, and listening for rattling.

If you suspect the timing belt is damaged, immediately stop driving the car, have it towed to a mechanic, and let them confirm if replacement is required – which typically costs $600 to $2000. Driving any distance with a faulty belt risks bending valves and costly repairs.

We’ll also answer common questions about broken timing belts, like whether the engine will turn over and if there are warning signs before total failure occurs.

How to Tell If Timing Belt Is Broken?

The timing belt is a crucial engine component that synchronizes the rotation of the crankshaft and camshaft. A broken timing belt can lead to serious engine damage and prevent the engine from starting. Here are some key signs that indicate your timing belt may be broken:

• Engine Won’t Crank or Turn Over: If the engine will not crank when you turn the key, it could point to a broken timing belt. Without the timing belt properly connecting the crankshaft and camshaft, the engine cannot complete the combustion cycle to start.
• Engine Misfires or Runs Very Rough: A broken timing belt throws off the precisely timed ignition sequence. This can lead to misfires, stumbling, loss of power, and overall rough running as the valves open at the wrong time.
• Ticking or Rattling Noise from Engine Area: If you hear a loud ticking or rattling noise coming from the front/center part of the engine, it could indicate a broken timing belt and the pistons hitting the valves.
• Oil Leak: In some cases, a broken timing belt can lead to bent valves that in turn cause an external oil leak as they no longer seal properly. Look for oil leaking from the front/center of the engine.

How to Check Your Timing Belt

To thoroughly inspect your timing belt:

• Visually Check the Belt: Carefully examine the full length of the timing belt for any cracks, fraying, damaged teeth, or obvious tears. Also look for signs of surface glazing.
• Check Belt Tension: Use a belt tension gauge tool to test the tension. A loose timing belt that has stretched from wear will disrupt the camshaft-crankshaft timing.
• Listen for Unusual Noises: Start the engine and listen closely for any rattling or ticking noises coming from the front of the motor. Any excessive noise could mean issues.

What to Do If You Think Your Timing Belt Is Broken

If you suspect your timing belt is broken, it is smart to be extremely cautious. Follow these steps:

• Do Not Start the Engine: Attempting to start the engine with a broken timing belt often leads to bent valves, piston damage, and other problems.
• Have the Vehicle Towed: Safely have the vehicle towed to a certified mechanic for diagnosis and repair. Inform them of the potential timing belt issue.
• Let Mechanic Inspect Timing Belt: They will be able to conduct a thorough inspection and confirm if the timing belt is damaged or broken and needs to be replaced.

Replacing a broken timing belt and repairing any engine damage is crucial. While the exact repair costs vary by vehicle, it typically ranges from $600 – $2,000 or more for parts and labor. Catching the issue early helps minimize the overall engine damage.

How Long Can You Drive with a Bad Timing Belt?

It is not recommended to drive any extended distance with a bad or damaged timing belt. In most cases, your vehicle will not run or start properly. Driving any miles with a faulty timing belt could lead to very expensive engine repairs. Replace the belt as soon as issues are suspected.

Is There Any Warning Before Timing Belt Breaks?

Yes, there are some subtle warning signs before most timing belts completely break:

• Whining noise from engine area
• Visible cracks/wear on timing belt edges
• Belt slipping or loose tension
• Oil leaking at front of engine

Being aware of these signs and proactively checking your timing belt can help avoid being left stranded with a broken belt.

Will Engine Turn Over If Timing Belt Broke?

If the timing belt has fully broken and separated while driving or attempting to start the engine, the engine will typically not turn over or crank at all when you try starting it. The extensive mechanical damage makes it impossible for the engine to properly complete a full revolution when the camshaft and crankshaft are no longer synchronized.