省时省力... 主流换法是正时皮带，水泵，张紧轮系统（怠轮 if any）通通换，否则 no point 换正时皮带...
When the timing belt is replaced, other parts, including the tensioner, should be replaced at the same time. This is because these components wear out at essentially the same rate as the belt. For instance, the tensioner bearings could dry out or even seize.
他这个办法省的只是不用压缩tensioner，把新带推进去挤开旧带时会伤害新带，而且空间也得夠大才行。
又不伤带又简单的换法是对正了camshaft pulleys 之后画下对应的旧带位置，拆下旧带，把记号copy 到新带上，装新带，对正记号，释放 tensioner，done.
再过3万迈我的Camry V6又得换timing belt了，这次得换water pump 了，上次都没换。
我绝不会用新带去挤旧带，timing belt 容不得丝毫损伤。
而且有的water pump的Pully外侧面是有lip的，皮带要跨过去才能装上pulley 的，很怀疑他那办法能行。
明白了crank 和 cam 之间的关系，正时皮带定位很容易的。
就知道不完全松开tensioner都不能跨过water pump pulley那道坎，绝对不是能像他说的能＂滑＂进去的，能＂滑＂进去一转两圈立马就给你滑出耒。
装上后皮带任意对应两点间的齿数一定要一样。
When the timing belt is replaced, other parts, including the tensioner, should be replaced at the same time. This is because these components wear out at essentially the same rate as the belt. For instance, the tensioner bearings could dry out or even seize.
皮带自身， 而是其它部件损坏后的连带结果。
作业过程
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