TM 5-4220-211-12&P
4-7.
ENGINE. Identification of major symptoms, probable causes and recommendations for corrective action for the
engine are contained in Table 4-4.
Table 4-4. ENGINE TROUBLESHOOTING
Symptom
Probable Cause
Correction
Engine Does Not Start
Fuel Tank Empty or
Fill Tank with
Filled with Improper Fuel
Diesel Fuel
Throttle Lever at Stop
Place Throttle Lever
at Maximum When
Starting
Engine Primer Button
Engage Primer Button
Not Pulled
Fuel Filter or Lines
Replace Filter
Clogged
Element, Clean Lines
Air in Fuel System
Bleed Fuel Lines
Low Compression
Check Piston Rings; Check
Valve Condition and Clearance;
Check Head Gasket Condition;
Check Rod Bearing Wear-
Overhaul if Necessary
Engine Does Not Start
Faulty Fuel Injection
Check Feed Rate of
Pump; Adjust or Replace as
Necessary-Replace Injector
Engine Oil Too
Use Oil of the Proper
Viscous (Heavy)
Viscosity for Climate Conditions
Improper Governor Clearance
Adjust Governor Clearance
Engine Starts, Then Stops
Fuel Primer Button
Pull Down Button
Not Pulled Down
Starting Load Too Great
Reduce Engine Load
Engine Stalls When Warm
Fuel Too Hot
Eliminate Cause
for
Excess
Heat in Fuel
Engine Runs Unevenly;
Fuel Supply Too Low
Replace Fuel Filter
Low Output
Filter Clogged
Element; Check Contents of
Tank
Not Enough Fresh Air
Provide Engine
Enclosure
with
Adequate
Openings for Fresh Air
Air in Fuel System
Bleed Fuel Lines
Fuel Line(s) Leaking
Check and Tighten
Improper Valve Clearance
Adjust Valves
4-13