五十铃柴油机共轨喷油器总成DLLA156P2481

碰到预喷点偏大很多，且不能通过减薄衔铁升程垫片厚度来减小的情况下，我们首先应该怀疑油嘴座面是否存在泄漏。

由于预喷点的轨压，但是通电时间很短，喷油量也很小，一旦油嘴座面存在泄漏，泄漏的油量会连同喷射量一起进入集油器，从而导致测试油量偏大！而全负荷点和排放点的喷射量相对较大，AVL GK低怠速点的轨压很低，因此它们的油量受油嘴座面泄漏的影响不明显。

哪些情况会导致油嘴座面泄漏呢可能原因有：

1）油嘴密封座面损伤；

2）针阀头部密封面破损（如碳涂层脱落）；

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