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4 DIAGNOSIS XF engine brake 95 XF series 4-2 FAULT: DEB REMAINS ENGAGED Possible cause Remedy Elektrische storing. Check electrical circuit. Magnetic valve mechanically blocked. Check magnetic valve. Damaged magnetic valve sealing rings. Replace all magnetic valve sealing rings. FAULT: DEB OPERATES IRREGULARLY Possible cause Remedy Electrical fault. Check electrical circuit. Incorrect setting of DEB clearance. Check DEB setting. Main piston stuck in DEB housing. Check free movement of main piston. Operating piston stuck in DEB housing. Check free movement of operating piston. Damaged magnetic valve sealing rings. Replace all magnetic valve sealing rings. Magnetic valve oil strainer is blocked. Clean magnetic valve oil strainer. Control valve stuck in DEB housing. Check free movement of control valve. Defective control valve. Check the operation of the control valve. Lubricating oil too thick. Run the engine at operating temperature. Lubricating oil diluted with fuel. Check lubricating oil for dilution. Air bubbles in the oil. Check the engine’s oil level/oil specification. Oil duct plugs in DEB housing. Clean/replace plugs. 1 © 0008 |