Tham khảo tài liệu 'cummins engine shop manual part 12', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | ợ m LÓỘ Ị o O. O 5 2 T t à 3 O O 3 O 3 Cause X co Wear of front support pilot . Ơ Intake or exhaust valve stuck or damaged - Intake or exhaust valve broken or worn Bushings or bearings main bearing connecting rod bearing 1 cam bushing etc. worn ỵ 1 PT pump out of adjustment excessive injection 1 A Air in fuel piping between float tank and PT pump X Injector clogged and cup worn J Injector plunger seized p 1 PT pump out of adjustment low speeds out of adjustment Thermostat defective stays open o Ả X X Vibration damper defective 1 OJ v 1 Engine mounting bolts loose 1 ó j ợ B L0 lì È cộ o 7 C Q rn 14 o q O TROUBLESHOOTING TESTING AND ADJUSTING 17. Abnormal noise emitted. When noises indicating internal damaged are being emitted continuing to operate the machine may make the damage worse. As far as possible classify the abnormal noise to make location of the cause easier. Type of noise Interference Abnormal combustion Gears Internal external Engine power train The following symbols are used to indicate the action to be taken when a cause of failure is located. X Replace A Repair A Adjust C Clean No. Problems Remedy XXX X Ax xZycx x a x a X X Ax 1 External or interference engine noise occurs. o 2 Exhaust gas is black. o o o o o 3 Combustion noise is abnormal. o o o o 4 Water temperature does not rise. o 5 Vibration damper is not warm to touch after operation during operation gear noise is also excessive. o 6 Fuel pressure discharge pressure is high. Seal of PT pump is abolished. o 7 Compression pressure is lack blow-by is excessive. o 8 Valve clearance is too large or too small. o 9 Injector function is defective. Plunger does not move up and down. o 10 Injector injection spray is defective. Remove it and check. o 11 Remove oil pan. When checking it internal engine noise is excessive. o 12 Remove gear cover. Gear noise is occurred. o 13 Remove cam follower housing. It is abnormal. o 14 When removing cylinder head. Internal engine noise is excessive. o 12-070 N855SERIES
