TM 5-3805-280-24-2
Engine System Operation and Tests
DIAGNOSING ENGINE MALFUNCTIONS
105
18
Engine compression too low
Engine Will Not Crank
Engine overheating
Worn camshaft lobes
Electrical System Malfunction
Fuel System Malfunction - See Group 115
Weak battery
Corroded or loose battery connections
Defective fuel injection pump
Defective main switch or start safety switch
Low fuel supply
Starter solenoid defective
Fuel injection nozzles defective or leaking
Starter defective
Fuel filter or fuel lines restricted
Defective fuel transfer pump
Engine Hard to Start or Will Not Start
Fuel injection pump incorrectly timed
Electrical System Malfunction
Engine Misfiring
Loose or corroded battery connections
Weak battery
Service Problem
Excessive resistance in starter circuit
Water in fuel
Mixture of gasoline and diesel fuel
Fuel System Malfunction - See Group 115
Fuel System Malfunction - See Group 115
Empty fuel tank
Improper fuel
Air in fuel system
Water, dirt or air in fuel system
Defective fuel injection nozzles
Plugged fuel filter
Defective fuel injection pump
Stuck shut-off control
Fuel injection nozzles improperly installed
Dirty or faulty fuel injection nozzles
Leaking fuel injection nozzle seals
Defective fuel injection pump
Worn or defective fuel transfer pump
Defective fuel transfer pump
Fuel injection pump incorrectly timed
Fuel injection pump incorrectly timed
Basic Engine Problem
Service Problem
Too high viscosity crankcase oil
Engine overheated
Lobes of camshaft worn
Weak valve springs
Engine Runs Irregularly or Stalls Frequently
Pre-ignition
Engine compression too low
Basic Engine Problem
Improper valve clearance
Burnt, damaged or stuck valves
Coolant temperature too low
Improper valve clearance
Lack of Engine Power
Cylinder head gasket leaking
Worn or broken compression rings
Service Problem
Valves sticking or burned
Exhaust system restricted
Continued on next page
RG,105,JW7655
1921NOV971/4
13-495
