This paper mainly expounds four inspection means for three big precision coupling of fuel supply system in diesel engine based on the practice, which can be covered for practical operation.

• 通过实践总结和分析,论述柴油机燃油供给系统三大精密偶件,即柱塞、出油阀和针阀偶件的四种检测方法,为实际操作提供经验。