问:机械改变cambelt和水泵,同时返回它,它跳下。引擎停止死亡。没有更多的引擎

我的引擎过热前周末第一次。没有热空气加热器的!只有冷。所以我认为水泵,把一个新的。打电话来安装,所有车库说我需要一个新的cambelt !好的没有问题。在当地车库没有空格,打电话给一个朋友推荐他的朋友9年经验和收取£200改变cambelt和水泵。拿起车,说,第二天下午返回。有一个文本“方式”,需要他的钱。当他cambelt工具包提供。 Next got call car stopped and cambelt jumped off. What follows is that is its NOT HIS FAULT? He saying apparently someone previous had "helicoil" one off the pulley holes and that whilst returning the car this had failed and had made the belt jump. Now he says that none of this is his fault and that he will not charge for labour, if I pay for bits. As internal engine damage. Car at present is nearly worth less and I'm out of pocket with no driveable car.

我的车有149000英里。
我的车有一个手动变速箱。