4. MAINTENANCE 6. Engine (Continued) 65 Problem Cause Remedy Starter does not run Battery discharged Charge. Starter malfunctioning Repair or replace. Key switch malfunctioning Repair or replace. Wiring disconnected Connect. Engine revolution is not smooth Fuel filter clogged or dirty Clean or change. Air cleaner clogged Clean or change. Fuel leak due to loose injection pipe retaining nut Tighten nut. Injection pump malfunctioning Incorrect nozzle opening pressure Repair or replace. Adjust. Injection nozzle stuck or clogged Repair or replace. Fuel overflow pipe clogged Clean. Governor malfunctioning Repair.
Either white or blue exhaust gas is observed Excessive engine oil Reduce to the specified level. Low grade fuel used Repair or replace. Fuel filter clogged Adjust. Air cleaner clogged Adjust top clearance. Either black or dark gray exhaust gas is observed Overload Lessen the load. Low grade fuel used Use the specified fuel. Fuel filter clogged Clean or change. Air cleaner clogged Clean or change. Excessive lubricant oil consumption Piston rings gap facing the same direction Shift gap direction. Oil ring worn or stuck Replace. Piston ring groove worn Replace. Valve stem and guide worn Replace. Crankshaft bearing and crank pin bearing worn Replace.
Fuel mixed into lubricant oil Injection pump’s plunger worn Replace pump element or pump. Injection pump broken Replace. Water mixed into lubricant oil Head gasket defective Replace. Cylinder block or cylinder head flawed Replace. Low oil pressure Engine oil insufficient Replenish. Oil strainer clogged Clean. Relief valve stuck with dirt Clean. Relief valve spring weakened or broken Replace. Excessive oil clearance of crankshaft bearing Replace. Excessive oil clearance of crank pin bearing Replace. Excessive oil clearance of rocker arm bearing Replace. Oil passage clogged Clean. Oil pump defective Replace. High oil pressure Different type of oil Use the specified oil type.
Relief valve defective Replace.