Question 18Motor Plants - 1st Asst/Chief70% to pass
Bouncing of the valve gear in a diesel engine can be caused by_______________.
AI Explanation
The correct answer is B) spring surge.
Bouncing of the valve gear in a diesel engine can be caused by spring surge, which occurs when the valve springs are unable to keep up with the rapid opening and closing of the valves during high-speed operation. This can lead to the valve train components, such as the valve stems and rocker arms, losing contact with each other, resulting in valve bounce.
The other options are incorrect because:
A) Prolonged high-speed operation can contribute to spring surge, but it is not the direct cause of valve gear bouncing.
C) Worn valve seats may affect valve sealing, but they do not directly cause valve gear bouncing.
D) Excessively tightened spring retainers can also contribute to valve gear bouncing, but spring surge is the primary cause.
Related Questions
#16 When one cylinder has a lower compression pressure and higher exhaust gas temperature than any of the other engine cylinders, which of the conditions listed will be indicated? #17 If a valve seat insert, similar to that shown in the illustration is cracked, this may be indicated by_______________. Illustration MO-0043 #19 Excessive wear at part #11, as shown in the illustration, would result in_______________. Illustration MO-0027 #20 Worn diesel engine intake valve guides can result in_______________.#21 Low compression pressure in a diesel engine can be caused by_______________.