B3.9, B4.5, B5.9 Industrial Engine Diagrams Section E - Engine and System Identification Page E-5 Engine Diagrams Engine Views Front View - B3.9 Industrial 1. Turbocharger air outlet 2. Lubricating oil fill 3. Engine air inlet 4. Fuel pump drive cover 5. Front gear cover 6. Accessory drive cover (optional) 7. Fan drive belt 8. Front Pulley 9. Water pump 10. Automatic belt tensioner 11. Water inlet 12. Alternator 13. Fan pulley 14. Turbocharger air inlet.