16. TROUBLESHOOTING 16.6.3 ENGINE e e (): Always contact your Komatsu distributor when dealing with these items. Incases of abnormalities or causes which are not listed below, please contact your Komatsu distributor for repairs.
Main causes Problem Engine oil pressure monitor lights up Remedy Add oil to specified level, see “CHECK BEFORE STARTING” Replace cartridge, see “EVERY 500 HOURS SERVICE” (¢ Check, repair) 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 engine oil pressure sensor Steam is emitted from top part of radiator (pressure valve) (¢ Replace sensor) Cooling water level low, water leakage Loosen fan belt Dirt or scale accumulated in cooling system Radiator water level monitor lights up Change cooling water, clean inside of cooling system, see “WHEN REQUIRED” Defective thermostat Loose radiator filler cap (high altitude operation) Clean or repair, see “EVERY 500 HOURS SERVICE” (¢ Replace thermostat) Tighten cap or replace packing Defective water level sensor (¢ Replace sensor) Clogged radiator fin or damaged fin — Engine does not start when starting motor is turned Add cooling water, repair, see “CHECK BEFORE STARTING” Adjust fan belt tension, see “EVERY 1000 HOURS SERVICE” Lack of fuel!
Air in fuel system Add fuel, see CHECK “BEFORE STARTING” Repair place where air is Defective fuel injection pump or nozzle Starting motor cranks engine sluggishly Preheating monitor does not light up Defective compression sucked in, see “EVERY 500 HOURS SERVICE” (e Replace pump or nozzle) See ELECTRICAL SYSTEM Fuel lines blocked 2-96 (° Adjust vaive clearance) ¢ Drain & clean fuel system ¢ Check/replace pump ¢ Change filters ¢ Check/blow out lines PC160/180/200-6k-ENG Defective valve clearance Contaminated fuel Lift pump not working Fuel filter clogged