TM 5-3805-293-10
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ENGINE
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1. General. The grader is equipped with a Caterpillar C6.6 Acert VHP turbocharged diesel engine with six in-line
cylinders, generating 153 horsepower @ 2,000 RPM.
2. Fuel System. Diesel fuel is drawn from the tank by a fuel transfer pump, filtered by a primary fuel filter, routed
to the fuel injection pump and secondary filter, and then injected through the fuel injector nozzles into the
engine cylinders. Air is drawn in through dry-type, replaceable filter elements. A check valve removes incoming
dust from the air and routes it out through the exhaust system. The air is routed from the filter assembly to the
turbocharger which pressurizes the air and sends it to the air-to-air aftercooler. The aftercooler, located near
the radiator, reduces the air temperature making it denser. The denser air charge allows for more air and fuel
to be combusted per engine cycle, increasing engine output power.
3. Cooling System. Provides coolant to the engine. Coolant is circulated through the engine by a gear-driven
water pump. The hydraulic oil cooler is located in front of the radiator. The engine oil cooler is integral to the
engine. The transmission oil cooler is located behind an access cover below the left front access door.
4. Lubrication System. The engine lubrication system consists of a gear-driven oil pump, oil filter, oil cooler, and
oil pan. The engine is lubricated by cooled and pressurized oil that is circulated through the engine block and
head.
5. Exhaust System. The exhaust system removes exhaust gases from the engine through the exhaust manifold
and turbocharger. The gases flow into exhaust pipes and a muffler to the atmosphere behind the cab.
Figure 1. Engine Components.
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