1. Introduction
timing belt
When the timing belt is to play the role of connecting link, is connected to an upper portion of the engine head timing pulley, is connected to a lower portion of the crankshaft timing pulley; timing pulley connected to the camshaft, on the camshaft cam, it is a small point of contact rocker, the rocker arm by a pressure force caused by the timing belt, play the role of the top; from the top the intake valve action is atomized fuel into the cylinder so that, when the top door is to allow the exhaust from exhaust gases of the cylinder; recess when the camshaft (Note: not projection areas) while contacting small place of the rocker arm time, this time the intake and exhaust valves are closed, the compression ratio to produce, distributor ignition, combustion and began to generate power!
In a four cylinder vehicle, for example, his firing sequence is 4,1,2,3, 3,4,1,2 may be, may be 2,3,4,1; from a cylinder we Speaking; intake valve
a cylinder of an internal combustion generating exhaust valve are closed;
At this time the two cylinder almost immediately closing the intake valve, the exhaust valve is closed;
At this time three-cylinder intake valve is opened almost completely sucked into the gasoline, the exhaust valve closing;
At this time to complete a four-cylinder internal combustion intake valve is closed, the exhaust valve is completely open exhaust!
2, action
the timing action of the belt is that when the engine is running, the opening and closing stroke (the vertical movement) the valve piston (time) order of ignition (time), in under the “timing” of the ligation, the time to keep the “synchronize” operation.
3, regular replacement
belongs to a timing belt wear goods, and once the timing belt breaks, the camshaft timing shining certainly not operate at this time is likely to result in Valve piston impact and cause serious damage, so the timing beltBe sure to replace the original according to the specified mileage or time.
during operation of an automobile engine, continue to occur within the cylinder intake, compression, explosion, exhaust process is four, and the timing of each step to be engaged with the motion and position of the piston, so that intake and exhaust pistons and coordinated lifting up, the engine timing belt which plays a role of “bridge”, driven by the power of the crankshaft is transmitted to the corresponding parts. There are many high-end cars in order to ensure stable timing system, the use of metal chains instead of belts. Since the timing of the vehicle engine a toothed belt will cause damage to the internal valve, harmful after fracture, so the manufacturers are generally of the timing belt with a predetermined replacement cycle.
belongs to a timing belt rubber member, as the engine operating time, the timing belt and the timing belt attachment, such as timing belt tension pulley, timing belt tensioner and water pumps are worn or aging. Therefore, any of the engine with the timing belt, manufacturers will have strict requirements, and a timing belt replacement attachments periodically within a predetermined period, the replacement cycle of the engine with different configurations vary, generally in the vehicle travels to 6 when should million to 100,000 km replacement, the replacement cycle should be based on vehicle maintenance manual instructions shall prevail.
Consider the timing belt is generally replaced when 80,000 km. Even if your vehicle equipped with a timing belt, once it is broken, and he can not be replaced. Therefore, when the total distance traveled to reach 80,000, it is recommended to consider replacing it. Timing belt in the back of the tank fan.
4, history
timing belt for the first time in 60 years, for most of the four-cylinder car, and more and more used in the V6 engine. The timing belt was originally applied to an overhead cam engine, compared with the conventional timing chain, timing belt.
5, regular maintenance
Nowadays, with the increasing sophistication of the car, repair work will be gradually reduced. As a result, ownersWe tend to think that their vehicles do not need basic repairs. The automobile manufacturers clearly defines the cycle timing belt for routine inspection and replacement, as a professional service technician, you should point to these owners made it clear: as regular maintenance, a comprehensive inspection of the content, timing belt maintenance It should be added to the regular maintenance program. If we ignore this, there is no regular inspection and timely replacement of faulty timing belt can cause serious consequences.
Unlike the driving belt attachment, they are easy to see and easy to check. Timing belt is often hidden behind a cover, should be based on engine and engine compartment layout can touch. However, in most cases, cover the timing belt, at least the upper half of the cover is removed or can be removed for easy you can carefully inspect and replace the belt. When checking to see if maintenance is not good, moderate tension belt, you should promptly put it replaced.
6, rupture
broken timing belt, if the belt is bitten, then stop valve in the open state, while the engine is stopped; rupture if the engine is idling, it means that there gap between the valve piston and the open top of the stroke. In both cases broken, damaged, just the timing belt itself. However, if the engine is an “interference fit” design, the valve piston and occupy the same space, without a gap therebetween, it will soon damage the other components, such as the valve is bent by stamping the piston. These failures will enable customers to spend more, but still can not face the long car trouble. Therefore, you should periodically check for customers to understand, the importance of the timely replacement of the timing belt. At the same time, it should also allow users to know: replace the timing belt when routine maintenance, overhaul much cheaper than later dragged into the repair shop.
increased revenue, busy employees and customers to a better understanding of regular maintenance will allow you to benefit from the Philippine shallow. Some maintenance plant ignore the timing belt Regular maintenance and repair opportunities offered. As a repair shop operators should remember: the vehicle in your store, you have the opportunity to repair it, and customer satisfaction. This is your opportunity to make money. However, if the vehicle is traveling on the way, belt damage, carIt will be dragged Other nearby repair shop. This means that you not only lose the opportunity to customers and maintenance of vehicles, but also lost the possibility of making money.
7, check the
timing belt is not broken, it does not mean there is no problem. With the older with the belt, the extent of stretching it is bound over a range capable of compensating for the tensioning device and thus the generation timing sprocket slipping. The tooth wear, lubricating oil and other adhesion can lead to slippage. Check, if the belt is reduced hardness, abrasion, fiber breaks or cracks, the crack phenomenon, it indicates that the belt has been damaged, we can not continue to be used. Next, check the sprocket failure. Damage to the sprocket can “burn” the belt material, and increased belt teeth wear. Fault sprocket valve mechanism can also have a greater resistance to the timing belt.