GUARD AS 5174619 - Caterpillar

Illustration 1 g01042301
Valve system components
(1) Rocker arm
(2) Bridge
(3) Rotocoil
(4) Valve spring
(5) Pushrod
(6) Lifter As each camshaft turns, the lobes on the camshaft cause lifters (6) to move up and down. This movement causes pushrods (5) to move rocker arms (1). The movement of the rocker arms cause bridges (2) to move downward. The bridges open two valves simultaneously. The valves can be either inlet valves or exhaust valves. There are two inlet valves and two exhaust valves for each cylinder.Valve springs (4) cause the valves to close when the lifters move downward.Rotocoils (3) cause the valves to turn while the engine is running. The rotation of the valves keeps the carbon deposits on the valves to a minimum which gives the valves a longer service life.