DL06 Diesel Engine Technical Information 49 Condition Causes Remedies 1) Starting difficult (1) Starting motor trouble (2) Fuel system trouble (3) Compression pressure lack z Refer to diagnostics z Refer to diagnostics z Valve's poor shut, stem distortion z Valve spring damage z Cylinder head gasket's leak z Wear of piston, piston ring or liner Repair or replace Replace valve spring Replace gasket Adjust 2) Idle operation abnormal z Injection timing incorrect z Air mixing at high pressure pump Check by EDIA Remove air 3) Engine output insufficient (1) Continuous output insufficient (2) Output insufficient when in acceleration z Valve clearance incorrect z Valve tightness poor z Cylinder head gasket's leak z Wear, stick, damage of piston ring z Injection timing incorrect z Fuel injection amount insufficient z Injector injection pressure improper or stuck z Supply pump's function lowered z Fuel pipe system clogged z Air suction amount insufficient z Turbocharger poor Adjust Repair Replace gasket Replace piston ring Check Check Adjust or replace Repair or replace Repair Clean or replace air cleaner Repair or replace z Compression pressure insufficient z Injection timing incorrect z Fuel injection amount insufficient z Injector infection pressure, infection angle improper z Supply pump's function lowered z Air intake amount insufficient Disassemble engine Check Check Repair, replace Repair or replace Clean or replace air cleaner 4) Overheating z Engine oil insufficient or poor z Cooling water insufficient z Fan belt loosened, worn, damaged z Cooling water pump's function lowered z Water temperature regulator's operation poor z Valve clearance incorrect z Exhaust system's resistance increased Replenish or replace Replenish or replace Adjust or replace Repair or replace Replace Adjust Clean or replace