TM 5-3805-280-24-2
Engine System Operation and Tests
Fuel injection pump delivers too much fuel
Air cleaner restricted or dirty
105
19
Fuel injection pump incorrectly timed
Excessive resistance in air intake system
Improper crankcase oil
Excessive Oil Consumption
Fuel System Malfunction - See Group 115
Basic Engine Problem
Fuel filter restricted
Oil control rings worn or broken
Defective fuel transfer pump
Scored cylinder liners or pistons
Defective fuel injection pump
Excessive resistance in air intake system
Fuel injection pump incorrectly timed
Oil flow through oil passages restricted
Worn valve guides or stems
Basic Engine Problem
Excessive oil pressure
Piston ring grooves excessively worn
Engine overheated
Piston rings sticking in ring grooves
Engine clutch slipping
Insufficient piston ring tension
Defective cylinder head gasket
Piston ring gaps not staggered
Lobes of camshaft worn
Excessive main or connecting rod bearing clearance
Improper valve clearance
Front and/or rear crankshaft oil seal faulty
Improper valve timing
Glazed cylinder liners (insufficient load during engine
Burnt, damaged or stuck valves
break-in)
Weak valve springs
Piston rings and cylinder liners excessively worn
Service Problem
Engine compression too low
Improper coolant temperature
Too low viscosity crankcase oil
Crankcase oil level too high
Engine Overheats
External oil leaks
Service Problem
Low Oil Pressure
Lack of coolant in cooling system
Service Problem
Radiator core and/or side screens dirty
Cooling system limed up
Low crankcase oil level
Engine overloaded
Clogged cooler or filter
Too low crankcase oil level
Improper crankcase oil
Excessive oil temperature
Basic Engine Problem
Oil pressure regulating valve failure
Defective oil pressure warning switch or engine oil
Loose or defective fan belt
pressure indicator light
Defective thermostat(s)
Damaged cylinder head gasket
Basic Engine Problem
Defective water pump
Defective radiator cap
Leakage at internal oil passages
Defective oil pump
Fuel System Malfunction - See Group 115
Continued on next page
RG,105,JW7655 1921NOV972/4
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