Section II. ENGINE FAILURE
General. Basic engines on certain generators are identical to other generator engines Motor supports,
manifolds, exhaust or cooling systems may require different brackets to interchange. Accessories and brackets must be
swapped from the unserviceable generator to make the replacement engine fit another application.
Engine Interchangeability . Availability of engines may become restricted to those found on damaged
equipment. Military Standard engines from other equipment can be modified to fit military standard generator sets
requiring another engine. Commercial generator sets engines cannot be exchanged unless the equipment is absolutely
Because there are so many engines procedures which vary depending on the
generator being repaired, the operator should refer to the original maintenance
technical manual for detailed instructions. A list of generator sets can be found in
Section III. ENGINE AIR INTAKE SYSTEMS
Engine Air Intake for Normally Aspirated Engines . Normally aspirated engines require that the first cycle
piston movement is downward to create a vacuum drawing air into the intake system. The key to avoiding damage to
this type of system to prevent drawing unfiltered air into the engine. Repairs to this system should always be done with
materials that do not block the air flow and are securely attached to prevent them being sucked into the engine intake
Engine Air Intake for Turbocharged Engines . Turbocharged engines use exhaust gases to drive the
turbocharger to compress air and force it into the cylinder under pressure. The engine air intake system is therefore
vacuum and pressure. Assessment and repairs to turbocharged air system should therefore be based on the rules above
for the system up to the turbocharger inlet. For the outlet, the repairs should seal so that the air pressure does not
escape. Because the turbocharger is driven by exhaust gases, repairs of the drive system must seal the exhaust gases
to prevent depressurization.
Air Cleaner, Clogged. The air cleaner is essential for keeping dirt and dust from getting into the engine. Under
heavy dust conditions it can become clogged and restrict the air flow. Lack of air will result in incomplete fuel
combustion resulting in reduced power and excessive exhaust smoke. Dirt should be blown out of the filter with
compressed air directed from the inside of the filter element. The filter element should not be hit to dislodge dirt as this
can deform the sealing element and let dirt into the engine, causing internal damage.
b. Personnel/time required.
1 soldier/.25 hours
d. Procedural Steps.
(1) Remove air cleaner elements.
(2) Clean filters using one of the following possibilities: