GEAR (54 Teeth) 8S6980 - Caterpillar

Illustration 1 g00807706
(1) Cylinder liner
(2) Filler band
(3) O-ring seals
(4) Main bearing cap
(5) Bolt Cylinder liners (1) 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 in order to keep the cylinder liners cool. Filler band (2) and three O-ring seals (3) seal the coolant in the cylinder block.Main bearing caps (4) are fastened to the cylinder block with four bolts (5) per cap.
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(6) Spacer plate
(7) Gasket The engine has a separate cylinder head for each cylinder. An aluminum spacer plate (6) and gasket (7) is between each cylinder head and the cylinder block. The plate and the gasket accommodate the thickness of the cylinder liner flange.
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(8) Exhaust valves
(9) Inlet valves
(10) Gasket
(11) Water seals Each cylinder head has four valves. Two exhaust valves (8) and two inlet valves (9) are controlled by a camshaft and pushrods. For information on the operation of the valves, refer to Systems Operation, "Valve System Components". Valve guides are pressed into the cylinder heads. The spark plug is located between the four valves.Another gasket (10) on top of the spacer plate seals the oil drain passages between the cylinder head and the spacer plate. After the engine oil lubricates the components in the cylinder head, the engine oil drains back into the engine block.Coolant flows from the cylinder block into the cylinder head through water seals (11). The coolant flows through passages in the cylinder head. The coolant exits the cylinder head and flows into the water manifold.
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(12) Camshaft cover
(13) Crankcase cover Camshaft covers (12) allow access to the camshaft and valve lifters. Crankcase covers (13) allow access to the crankshaft connecting rods, main bearings, and piston cooling jets.