Model 2120 Tractor TM-4252 (Dec-70) Engine 20 General Information, Diagnosing Malfunctions 5-3 Injector tips defective or leaking LACK OF ENGINE POWER Fuel filter or fuel lines clogged Air cleaner clogged or dirty Defective fuel transfer pump Excessive resistance in air intake system Incorrect engine timing Fuel filter clogged Improper valve clearance Defective fuel transfer pump Cylinder head gasket leaking Defective fuel injection pump Worn or broken compression rings Defective fuel injectors Valves stuck or burnt Improper crankcase oil Excessive back pressure Engine overheated Engine compression too low Engine clutch drags Engine overheated Defective cylinder head gasket Defective fuel injection pump Cams of camshaft worn ENGINE MISSES Improper valve clearance Water in fuel Improper valve timing* Mixture of petrol (gasoline) and Diesel fuel Burnt, damaged or stuck valves* Air in fuel system Worn valve springs* Defective fuel injectors Incorrect engine timing Defective fuel injection pump Piston rings and cylinder liners excessively worn Engine compression too low* Fuel injectors improperly installed Improper coolant temperature Leaking fuel injector seals Engine overheated ENGINE OVERHEATS Cams of camshaft worn Lack of coolant in cooling system Worn valve springs Radiator core and/or side grille screens dirty Worn or defective fuel transfer pump Loose or defective fan belt Engine backfiring Defective thermostat Incorrect engine timing Cooling system limed up Engine compression too low Engine overloaded Improper valve clearance Injection pump delivers too much fuel Burnt, damaged or stuck valves Damaged cylinder head gasket * Measure blow-by at crankcase vent tube or carry out cylinder compression test.
See section 10, group 20. Printed in Germany