16. TROUBLESHOOTING 16.4.3 ENGINE 2-90 Problem Main causes Remedy Engine oil pressure monitor flashes when engine speed is raised after completion of warm- up.
‡ Engine oil pan oil level is low (sucking in air) ‡ Clogged oil filter cartridge ‡ Defective tightening of oil pipe joint, oil leakage from damaged part ‡ Defective caution lamp ‡ Add oil to specified level, see CHECK BEFORE STARTING ‡ Replace cartridge, see EVERY 250 HOURS SERVICE (‡ Check, repair) (‡ Replace lamp) Steam is emitted from top part of radiator (pressure valve) ‡ Cooling water level low, water leakage ‡ Loose fan belt ‡ Dirt or scale accumulated in cooling system ‡ Clogged radiator fin or damaged fin ‡ Defective thermostat ‡ Loose radiator filler cap (high altitude operation) ‡ Defective water temperature monitor ‡ Add cooling water, repair, see CHECK BEFORE STARTING ‡ Replace fan belt ‡ Change cooling water, clean inside of cooling system, see WHEN REQUIRED ‡ Clean or repair, see WHEN REQUIRED (‡ Replace thermostat) ‡ Tighten cap or replace packing (‡ Replace) Engine water temperature monitor remains alight Engine does not start when starting motor is turned ‡ Lack of fuel ‡ Air in fuel system ‡ Defective fuel injection pump or nozzle ‡ Starting motor cranks engine sluggishly ‡ Defective compression fi Defective valve clearance ‡ Add fuel, see CHECK BEFORE STARTING ‡ Repair place where air is sucked in (‡ Replace pump or nozzle) ‡ See ELECTRICAL SYSTEM (fi Adjust valve clearance) Exhaust gas is white or blue ‡ Too much oil in oil pan ‡ Improper fuel ‡ Add oil to specified level, see CHECK BEFORE STARTING ‡ Change to specified fuel Exhaust gas occasionally turns black ‡ Clogged air cleaner element ‡ Defective nozzle ‡ Defective compression ‡ Defective turbocharger ‡ Clean or replace, see WHEN REQUIRED (‡ Replace nozzle) (‡ Adjust valve clearance) (‡ Clean or replace turbocharger) Combustion noise occasionally makes breathing sound ‡ Defective nozzle (‡ Replace nozzle) Abnormal noise generated (combustion or mechanical) ‡ Low grade fuel being used ‡ Overheating ‡ Damage inside muffler ‡ Excessive valve clearance ‡ Change to specified fuel ‡ See item “Indicator of water temperature gauge is in red range on right side of gauge”.
(‡ Replace muffler) (‡ Adjust valve clearance)