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