TROUBLES AND ACTIONS 153 Problem Main causes Remedy Even when water temperature gauge indicator is in correct range, pilot lamp flashes • Defective thermostat (•) Replace thermostat Engine does not start when starting motor is turned • Lack of fuel • Air in fuel system • Water in fuel system • Defective fuel injection pump or noz- zle • Staring motor cracks engine sluggishly • Engine pre-heating monitor does not lights up • Defective compression • Defective valve clearance • Add fuel, see CHECK BEFORE STARTING • Repair place where air is sucked in, see EVERY 500 HOURS SERVICE • Drain water from system, see WHEN REQUIRED and CHECK BEFORE STARTING (•) Replace pump or nozzle • See ELECTRICAL SYSTEM • See ELECTRICAL SYSTEM (•) Adjust valve clearance Exhaust gas is whiter or blue • Too mach oil in oil pan • Improper fuel • Add oil specified level, see CHECK BEFORE STARTING • Change to specified fuel Exhaust gas occasionally turns black • Clogging air cleaner element • Defective nozzle • Defective compression • Clean or repalce, see WHEN REQUIRED (•) Replace nozzles (•) See defective compression above Combustion noise occasionally makes bresthing sound • Defective nozzle (•) Replace nozzle Abnornal noise generated (combustion or mechanical) • Low grade fuel being used • Overheating • Damage inside muffler • Excessive valve clearnce • Change to specified fuel • See “Engine water temperature gauge indicator is in red range” • Replace muffler (•) Adjust valve clearance)