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February 12, 2010

第二天周五,天气晴好,依然冷的要命。继续休假修车子。

crankshaft pulley经过一夜的WD40浸泡,轻轻一拔就下来了。把一圈螺丝拧下来,取下timing belt中间的cover,就看见了timing belt。就跟上面那张图一样。不过那个不是我的图,是我从网上找来,然后加了标注。

注意到两边两个大齿轮和中间那个crankshaft齿轮上面的红油漆了没?那两个大齿轮是camshaft的齿轮,和crankshaft齿轮之间的相对位置不能变,否则汽缸点火顺序就错了。

所以在取下timing belt之前,要用油漆在齿轮和belt上面做标记,回头装的时候,按照标记装回去。当然如果你要换timing belt,还是把标记的位置记好,因为新belt上面可没标记。

取下timing belt,首先要把belt上面的张力放掉,就是要把那个timing belt tension的偏心轮取下。这个张力是靠timing belt tension弹簧来提供的,就是那根不起眼的粗家伙。这个弹簧力气很大,所以一般是要卡住它,免得以后不好压回去。弹簧上面有个孔,在里面插个钉子就可 以卡住了。我开始没有卡住它,后来用一个大clamp才把它压回去。
clamp长这个样子:
点看全图

把那个偏心轮取下来,timing belt就松了。取下来,注意不用去动camshaft的齿轮,当然你动了也没关系,那俩齿轮都是跟汽缸啊活门啊连着的,不是那么容易乱动,除非你用扳手。

终于可以换水泵了。新的水泵长这个样子:
点看全图

旧水泵长这个样子:
点看全图

注意到水泵有一大一小两个口了没?那个小口,是进水口,大口是coolant出来,去radiator的。小口和管子,就是用个夹子固定,大口上面连着个塑料接头,是用螺丝固定的。

水泵本身是用一圈螺丝固定在发动机上面的,和发动机接触的表面,是一个垫圈(gasket),垫圈上面用硅脂密封。松开那些螺丝,晃动水泵,就可以拿下来。然后把新水泵的gasket抹好硅脂,然后按原来的方位装好。

这个活不容易,因为水泵的位置很低,如果不把车头的radiator这些东西都拆掉的话,只能用手探进去摸索,而gasket又沾满了粘糊糊的硅脂,总是 会移动,或者粘在别的东西上面。我花了15分钟才把新水泵安回去。然后把螺丝逐个拧好,管子接起来,从radiator cap的那个口灌上一点coolant,看看是不是漏。一般总是会漏一点的,慢慢就好了。

1 Comment »

  1. Look forward to the next can see wonderful blog.

    Comment by UK Ugg Boots Sale — November 21, 2012 @ 10:26 pm

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