Exhaust Gas Recirculation (EGR) System

The Exhaust Gas Recirculation (EGR) system recirculates cooled exhaust gas to engine intake to reduce NOx emissions. See the maintenance inspection schedule.

See Service Bulletin SB894 on e-Tech Library for detailed EGR system maintenance interval information. SB894 EGR Maintenance Interval Update – Yanmar Common Rail Diesel Engines

Important Always wear appropriate Personal Protective Equipment (PPE) when cleaning the EGR system. This includes safety glasses, rubber gloves, and a respirator.

  1. Remove the EGR pipe from between the EGR cooler and the EGR valve.

  2. Inspect the EGR pipe and other components for carbon deposits and clean as necessary.

  3. Reinstall the EGR pipe (and other components if removed) and only use new gaskets.

EGR Components

1. EGR Cooler
2. Coolant Pipe to EGR Cooler
3. EGR Pipe
4. EGR Valve

In this section:

  1. Cleaning EGR Valve
  2. Cleaning EGR Cooler
Parent topic: Engine Maintenance