Which of the following statements represents the function of the valve bridge and hydraulic lash adjuster assembly shown in the illustration? See illustration MO-0019.
• Hydraulic lash adjuster (HLA) purpose in an engine valve train • How oil pressure and the check ball work together inside the lash adjuster body • The role of the bridge spring relative to valve opening vs. clearance (lash) control
• From the cutaway (Figure 2), trace the oil flow and ask yourself: is the mechanism mainly opening the valve, or mainly keeping parts in contact without clearance? • Consider when the ball check is unseated vs. seated: during valve opening or closing? How would that affect oil entering or leaving the plunger chamber? • Ask what would happen to valve operation and noise if there were lash (clearance) between the bridge and valve stem, and how this assembly prevents that condition.
• Identify which option correctly describes a function related to maintaining proper clearance (lash) rather than directly forcing the valve open. • Check whether the bridge spring is strong enough to open exhaust valves against gas pressure, or if it more likely serves a lighter positioning/pressure role. • Verify in the figure whether the ball check can be "always" seated during valve closing, or if it must move to allow oil in or out at certain times.
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