Failure Analysis Of Blue Smoke in Kobelco Excavator Sep 16, 2021. Cause of blue smoke from excavator: 1. The cold car emits blue smoke. It may be that the fuel injection nozzle is stuck, or the diesel pump needs to be calibrated. A. The valve oil seal is not well sealed. B. There is a problem with the water separator. C. The piston ring is worn, causing the excavator to emit blue smoke. D.
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