ARMY TM 9-2815-255-24
AIR FORCE TO 38G1-95-2
MARINE CORPS TM 2815-24/4
Pressure checks are only a guide to determine if there is an engine problem (valve leakage,
defective nozzles, etc). Low readings are not a valid reason for increasing injection pump fuel
delivery. Pump adjustment should be within specification.
Observe pressure reading on gage. Reading should be at least 9 psi (60 kPa/0.6 bar) when engine is developing
rated power at full load rated speed.
If boost pressure is too high, remove and test fuel injection pump for high fuel delivery.
If boost pressure is too low, check for the following:
Restricted air filter elements.
Restricted fuel filter elements.
Incorrect fast idle adjustment.
Incorrect injection pump timing.
Exhaust manifold leaks.
Intake manifold leaks.
Faulty fuel transfer pump.
Low compression pressure.
Faulty fuel injection nozzles.
build-up in turbocharger.
compressor or turbine wheel rubbing housing.
fuel injection pump fuel delivery.
Remove test gage and install plug in intake manifold.
Section IV. COOLING SYSTEM MAINTENANCE
This section provides maintenance for cooling system components. Components of cooling system not mentioned in this
section can be found in the end item maintenance manual.
If the engine has been operating and coolant Is hot, allow engine to cool before you slowly
loosen filler cap and relieve pressure from cooling system. Failure to observe this warning could
result In severe personal Injury.
3-9. THERMOSTAT AND HOUSING.
Drain coolant system if not already drained, refer to and item maintenance manual.
Loosen hose clamp and remove outlet hose from cover (3, FIGURE 3-2).