Engine Timing Belts: 5 Things You Should Know

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Engine Timing Belts
5 Things
You Should Know

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INTRODUCTION

• Many people are aware that a damaged timing belt
  is bad news for a car's engine, but you may not
  be aware of much more. This simple component
  serves a crucial role and can spoil your day if
  it fails. We believe that learning more about
  timing belts will give you a greater appreciation
  for everything they do. Here are five things you
  should know about the car timing belt.

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-banded-belts/
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1. The Function of a Timing Belt

• To get a better understanding of what a timing
  belt performs, consider the combustion process of
  a gas engine. The intake valves in an engine's
  cylinders open to allow a combination of fuel and
  air into the combustion chamber. The valve closes
  and the piston moves up the cylinder to condense
  the fuel-air mixture. The mixture is ignited by a
  spark plug, and the combustion forces the piston
  back down. As the piston returns to the top of
  its stroke, an exhaust valve opens, letting waste
  gases be pushed out of the cylinder.
• The pistons are connected to a crankshaft, which
  converts piston motion into rotational output.
  Camshafts are responsible for opening and closing
  the intake and exhaust valves. The timing belt
  ensures that the motion of the camshaft or
  camshafts is in sync with that of the crankshaft.

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2. Why Is a Damaged Timing Belt So Unsafe?

• Free-running or non-interference engines were
  used in older vehicles. The pistons and valves in
  these engines never share the same space in the
  cylinder. Most modern engines, however, are
  interference engines. These engines permit the
  pistons to condense, even more, resulting in more
  powerful and efficient engines. The trade-off is
  that if the valves were open and the pistons were
  fully extended, the valves and pistons would
  occupy the same space in the cylinders.
• Because the crankshaft and camshafts are
  synchronized, this should not happenbut a
  damaged timing belt means that these two parts
  will no longer be synchronized. In a free-running
  engine, this would result in reduced engine power
  and, eventually, engine shutdown. However, things
  are not the same in interference engines. The
  pistons are likely to move up and strike the open
  valves, causing significant damage to a variety
  of internal engine components.

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3. Signs of a Failing Timing Belt

• Unfortunately, there are usually no warning signs
  that a timing belt is about to fail. There may be
  some minor indications, such as a ticking noise
  coming from the engine. However, these symptoms
  are easy to overlook and difficult to correctly
  diagnose. A timing belt will frequently crack
  without warning. As a result, it's critical to
  replace your timing belt when your owner's manual
  recommends it. Otherwise, you're taking a huge
  risk.

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4. The Cost of Timing Belt Replacement

• The timing belt is a simple rubber belt, and the
  component itself isn't particularly expensive.
  However, if you call any place and ask for an
  estimate on replacing a timing belt, you will be
  quoted hundreds of dollars. Why is this the case?
  Changing a vehicle's timing belt is a
  time-consuming and labor-intensive process. To
  replace the timing belt, technicians must
  disassemble a large portion of the engine, which
  takes a lot of time. Before removing the old
  belt, they will inspect the seals, pulleys,
  tensioners, and other components. Following that,
  they'll need to set the proper timing and test it
  to ensure the belt is working properly. Finally,
  the engine will be reassembled. This requires a
  lot of time and exceptional skill. As a result,
  timing belt replacements are among the more
  expensive services your car will require.
  However, it is still less expensive than
  rebuilding an engine.

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5. Timing Belts Are Not Common on All Vehicles

• If your owner's manual doesn't really specify
  when you should change your timing belt, your car
  may not have one at all. Instead, it could be
  outfitted with a timing chain. A timing chain, as
  the name implies, has the same function as a
  timing belt, but is made of metal rather than
  rubber. Timing chains, unlike timing belts, are
  unlikely to need replacement. They are, however,
  heavier and noisier than belts.

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Thanks!

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