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 TM 5-2010-205-14
c. Pistons, Rings, and Connecting Rods.
(1) The pistons have two rings which are located above the piston pin bore. There is one compression ring and
one oil control ring. The oil ring is made in one piece and has an expansion spring behind it. The compression ring is
also one piece and fits into an iron band cast into the piston. The piston pin is held in place by -two snap rings which go
into grooves in the piston pin bore.
(2) The connecting rod is installed on the piston with the boss on the connecting rod on the same side as the
crater in the piston. The connecting rod bearings are held in location with a tab that goes into a groove in the connecting
rod.
d. Crankshaft. The force of combustion in the cylinders is changed to usable rotating power by the crankshaft. A
gear on the front of the crankshaft turns the engine camshaft gear and the engine
oil pump.
1-14. TURBOCHARGER.
a. The watercooled turbocharger is supported by the exhaust manifold at the rear of the engine. All the exhaust
gases from the diesel engine go through the turbocharger. The exhaust gases enter the turbine housing and go through
the blades of a turbine wheel causing the turbine wheel and compressor wheel to turn. When the compressor
wheel
turns, it pulls filtered air from the air cleaner through the compressor housing air inlet. The air is put in compression by
action of the compressor wheel and is pushed to the inlet manifold of the engine. When the engine load increases, more
fuel is injected into the engine cylinders. The volume of exhaust gas increases which causes the turbocharger turbine
wheel and compressor impeller to turn faster. The increased RPM of the impeller increases the quantity of inlet air. As
the turbocharger provides additional inlet air, more fuel can be burned. This results in more horsepower from the engine.
b. Maximum RPM of the turbocharger is controlled by the fuel setting, the high idle speed setting and the height
above sea level at which the engine is operated.
c. The bearings for the turbocharger use engine oil for lubrication. The oil comes in through the lubrication inlet
passage and goes through passages in the center section for lubrication of the bearings. Oil from the turbocharger goes
out through the lubrication outlet passage in the bottom of the center section and goes back to the engine lubrication
system.
1-15. FUEL SYSTEM.
a. The sleeve metering fuel system is a pressure type fuel system. The name for the fuel system is from the
method used to control the amount of fuel sent to the cylinders. This fuel system has an injector pump for each cylinder
of the engine. It also has a fuel
1-9
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