BEARING-SLEEVE 1372817 - Caterpillar

The cylinder block is a one-piece casting of nodular iron that is heavily ribbed. The air inlet plenum runs the full length of the engine. This distributes the air evenly to all of the cylinders.The main bearing caps are fastened to the cylinder block with two studs per cap. The studs are hydraulically tensioned. Each main bearing cap has two saddle bolts. One bolt goes through each side of the cylinder block. The saddle bolts are used in order to prevent the movement of the main bearing cap. The saddle bolts are also used in order to add stiffness to the lower area of the cylinder block.The cylinder liners are alloy iron castings that are induction hardened. The cylinder liners are cooled by jacket water over the full length. The cylinder liners can be removed for replacement. The cylinder liner seats on the top face of the cylinder block. The cylinder liner is piloted below the liner flange at the top. The cylinder liner is sealed with an O-ring seal at the top and three O-ring seals at the bottom. The O-ring seals provide a seal between the cylinder liner and the cylinder block.The engine has a separate cylinder head for each cylinder. Each cylinder head contains the following components: two inlet valves, two exhaust valves, four replaceable valve seats and a unit injector. The inlet and exhaust valves move in replaceable valve guides which are pressed into the cylinder head.The valves are actuated by the following components: cam followers, pushrods, rocker arms, bridge assemblies and dowels for the bridge in the valve train. Each pair of inlet and exhaust valves are actuated by separate bridges which contact the rocker arm.The opening for the fuel injector is located between the four valves. The middle lobe on the camshaft moves the cam follower, the pushrod and the rocker arm that operates the unit injector. Fuel is injected directly into the cylinder.Combustion gas is sealed by a steel combustion seal ring gasket that is located between the cylinder liner flange and the head. Rubber O-ring seals are used in order to seal air, water and oil passages that are between the cylinder head and the cylinder block. The seals are located in two plates for each cylinder.Each cylinder head is fastened to the cylinder block by four studs and four nuts. These studs are hydraulically tensioned. The nuts are placed onto the studs by hand, and the hydraulic tension is released. The entire load of the stud is carried by the combustion seal ring gasket.
Illustration 1 g01167551
Right side of the C280-16 engine (typical example)
(1) Covers (access to camshaft)
(2) Covers (access to connecting rod bearings and the main bearings) Covers (1) allow access to inspect the camshaft. The covers also allow access for maintenance on the camshaft, the valve lifters and the valve lifter guides.Covers (2) allow access for inspection of the crankshaft. The covers also allow access for maintenance on the crankshaft, the connecting rods, the piston cooling jets, and the main bearings.