What do timing belts rely on to transmit torque?
Timing-belt drives transmit torque and motion from a driving to a driven pulley or force to a linear actuator. They may also convey a load placed on the belt surface. A drive under load develops a difference in belt tension between the entering (tight) and leaving (slack) sides of the driver pulley.
What happens when the timing belt is worn out?
A worn out timing belt might also impact the engine’s fire rate. The timing belt is attached to pulleys that drive the crank and camshaft as we’ve indicated above. However, sometimes the belt will slip on the camshaft drive and cause one cylinder to open or close earlier than it should.
How are timing belts connected to the crankshaft?
By definition a timing belt is a toothed belt that connects the camshaft or shafts to the crankshaft thus “timing”the top and bottom of the engine. The camshafts turn at exactly ½ of the speed of the crankshaft to time the valve operation to the piston operation.
How do you check the tension on a timing belt?
Check the tension by twisting the belt with your thumb and forefinger, midway along the longest straight run between the two main sprockets. If the belt tension is correct, you should just be able to twist it through 90 degrees. If you can twist it more or less than this, the tension needs to be adjusted.
When do you check the camshaft timing belt?
The tension of the toothed belt that drives an overhead camshaft must be checked at the intervals set by the servicing routine laid down in the car handbook. Check it also whenever you remove and refit the belt or the cylinder head . On a Ford overhead camshaft engine, the tension is set automatically when two bolts are slackened on the tensioner.
What’s the difference between a friction belt and a timing belt?
V-belts and flat belts employ the use of friction to transmit power while timing belts physically engage the pulley via teeth and grooves. A friction drive consists of two shafts connected by a belt that is drawn tight enough to grip each shaft and transmit torque. Generally, each shaft is fitted with a pulley which the belt is situated in.
By definition a timing belt is a toothed belt that connects the camshaft or shafts to the crankshaft thus “timing”the top and bottom of the engine. The camshafts turn at exactly ½ of the speed of the crankshaft to time the valve operation to the piston operation.
What causes a loose timing belt to break?
Loose timing belt tensioning acts like a loosely-held piece of string, with a snapping action as in a high torque situation the string or timing belt will break because the added stress is more than the timing belt was designed to take. While a taut string or timing belt can stand a strong pull.
Can a taut timing belt stand a strong pull?
While a taut string or timing belt can stand a strong pull. Take up any loose slack in the timing belt by adjusting the center to center distance between the two timing belt pulleys. Before any final tensioning is to be applied make sure that the timing belt teeth are fully seated in the tooth grooves on both timing belt pulleys.