PROBABLE CAUSES
FUEL SVSTEM
HYDRAULIC GOVERNOR EQUIPPED
1a. Emergency Shutoff Cock closed, or partly
16a. Press, Relief Valve Spring broken.
closed.
b. Press, Relief Valve stuck open.
b. Air Intake Manifold Valve closed, or partly
c. Shutdown Valve stuck or open.
closed.
d. Restricted Oil Supply.
c. Fuel Tank Vent plugged, partly plugged.
17. Air In Governor Oil Feed, insufficient oil
d. Low Ambient Air Temperature, use
pressure.
starting aid.
18. Loose Governor Ball-Head Drive Assembly,
2. Fuel Supply Pump inoperative or leaking.
excess Ball-Head Tang clearance.
3a. Air leaks or restriction, suction side of Fuel
19. Incorrect Speed Droop Setting, or length of
System.
speed follower spring.
b. Fuel Filters clogged.
TURBOCHARGER EQUIPPED
c. Filter Air Bleed too large or missing.
20a. Turbocharger passing oil.
d. Filter Air Bleed plugged, valve closed.
b. Restricted Air Intake, clogged Air Cleaner.
4. Injection Pump Overflow Valve leaky, stuck
c. Nozzle Ring restricted, slow charger rpm.
open or closed.
d. Binding Turbocharger Impeller.
5a. Injection Pump Internal adjustment incorrect.
ENGINE PROPER
b. Worn Injection Pump Shaft Bearings.
21a. I m proper
Valve clearance, Camshaft or
c. Loose Injection Pump Drive Assembly,
Lifters worn.
timing incorrect.
b. Broken or weak Valve Springs.
6a. Improper Setting of Governor or High Speed
c. Valve Guides worn or gummed.
Stop.
d. Valve(s) stuck or burned, poor seat
b. Improper Setting of Governor Idle Speed.
contact.
7. Fuel Return Line Plugged or crimped.
22a. Leaky Cylinder Head Gasket.
8. Delivery Valve stuck or leaking.
b. Leaky Gaskets or Seals.
9a. Faulty Nozzle Spray, leaky, opening pressure
23a. Rings stuck or worn.
incorrect.
b. Rings broken or Improperly fitted.
b. Nozzle Cap nut improperly torque.
24. Poor Compression. (See Low Comp.) 25.
c. Nozzle(s) Valve stuck.
Clogged Crankcase Breather or Pipe.
d. Bent or broken spindle or spring.
26. Blow-by.
e. Nozzle improperly installed in cylinder
27. Scuffed pistons or cylinder sleeves.
head (binding).
28. Excessive clearance In main or connecting rod
10a. Injection Pump Plunger stuck.
b. Injection Pump Rack stuck.
29. Water leak in combustion chamber, cracked
c. Injection Pump Plunger(s) worn.
head.
11a. Governor Throttle Shaft Linkage binding, or
LUBRICATION SYSTEM
sticky Governor parts.
30. Restriction in Oiling System, faulty gage.
b. Improper Setting of Governor Throttle
31. Pressure Relief Valve stuck closed, or faulty Oil
Linkage.
Pump Relief Valve.
c. Governor Drive Assembly binding.
d. Broken or weak Speeder Springs.
e. Solenoid stuck.
MECHANICAL GOVERNOR EQUIPPED 1
2a. Worn Governor Sliding Sleeve Assy.
b. Worn Governor Flyweight Fingers.
c. Worn Governor Linkage, excessive end-
play.
13. Improper rack, gap cam angle or cam plate
setting.
14. Broken Governor Throttle Spring or Linkage
disengagement.
15. Displaced Governor Throttle Shaft Bushings,
Yoke binding.
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