16. TROUBLESHOOTING 16.3.3 ENGINE Problem Main causes Remedy Engine oil pressure warning lamp remains alight when l Engine oil pan oil level is low (sucking in air) l Add oil to specified level, see CHECK BEFORE STARTING engine speed is raised after completion of warm-up .
Clogged oil filter cartridge SERVICE (o Check, repair) l Replace cartridge, see EVERY 500 HOURS l Defective tightening of oil pipe joint, oil leakage from damaged l Defective warning lamp part (o Replace lamp) Steam is emitted from top part of radiator (pressure valve) Cooling water level low, water Add cooling water, repair, see CHECK BEFORE STARTING leakage Loose fan belt Adjust fan belt tension, see EVERY 250 HOURS SERVICE Change cooling water, clean inside of cooling system Clogged radiator fin or damaged fin Defective thermostat Loose radiator filler cap (high Dirt or scale accumulated in cooling system, see WHEN REQUIRED Clean or repair, see EVERY 500 HOURS SERVICE (o Replace thermostat) .
Tighten cap or replace packing Indicator of water temperature gauge is in red range on right side of gauge altitude operation) Defective water temperature gauge (0 Replace water temperature gauge) indicator of water temperature gauge is in white range on left . Defective thermostat l Replace thermostat .
Replace water temperature gauge side of gauge l Defective water temperature gauge Engine does not start when starting motor is turned l Lack of fuel l Air in fuel system l Add fuel, see CHECK BEFORE STARTING l Repair place where air is sucked in (o Replace pump or nozzle) I l Defective fuel injection pump or nozzle l Starting motor cranks engine sluggishly See ELECTRICAL SYSTEM l Defective compression o Defective valve clearance l Heater signal does not glow red (c Adjust valve clearance) Exhaust gas is white or blue l Too much oil in oil pan l Add oil to specified level, see CHECK BEFORE STARTING l Improper fuel l Change to specified fuel Exhaust gas occasionally turns black l Defective nozzle .
Defective compression l Clogged air cleaner element . Clean or replace, see WHEN REQUIRED (o Replace nozzle) (o Adjust valve clearance) Combustion noise occasionally makes breathing sound l Defective nozzle (0 Replace nozzle) Abnormal noise generated (combustion or mechanical) l Low grade fuel being used . Overheating l Change to specified fuel l See item “Indicator of water temperature gauge”. (0 Replace muffler) 10 Adjust valve clearance) gauge is in red range on right side of . Damage inside muffler l Excessive valve clearance 2-57