COLLAR ASSEM. 9S5515 - Caterpillar

cylinders in the left side of the block form a 60 degree angle with the cylinders in the right side. The main bearing caps are fastened to the cylinder block with four bolts per cap.The cylinder liners can be removed for replacement. The top surface of the cylinder block is the seat for the cylinder liner flange. Engine coolant flows around the cylinder liners to keep the cylinder liners cool. Three O-ring seals around the bottom of the cylinder liner make a seal between the cylinder liner and the cylinder block. A filler band goes under the cylinder liner flange. This makes a seal between the top of the cylinder liner and the cylinder block.The engine has a separate cylinder head for each cylinder. Two inlet valves and two exhaust valves, which are controlled by a hydraulic pushrod valve system, are used for each cylinder. Valve guides without shoulders are pressed into the cylinder heads. The opening for the injector is located between the four valves.There is an aluminum spacer plate between each cylinder head and the cylinder block. Coolant goes out of the cylinder block through the spacer plate and into the cylinder head through eight openings in each cylinder head face. Water seals are used in each opening to prevent coolant leakage. Gaskets seal the engine oil drain line between the cylinder head, the spacer plate, and the cylinder block.