http://www.oyen.eu:8080/Public/Yanmar_engine/Mastering%20the%20Diesel%20Air%20Heater%20LCD%20Digital%20Control%20Unit.pdf http://www.oyen.eu:8080/Public/Yanmar_engine/yanmar-cooling-system-chapter8.pdf http://www.oyen.eu:8080/Public/Yanmar_engine/YanmarGM_HMWorkshopManual.pdf http://www.oyen.eu:8080/Public/Yanmar_engine/Yanmar_3GM30F3.pdf