1.
A wet compression test is being performed on a four cylinder
engine. The number two cylinder is low and the compression
reading stays the same after adding oil. Technician A says the
engine needs piston rings. Technician B says the engine has a
faulty valve. Who is correct?
o A.
Technician A
o B.
Technician B
o C.
Both Technician A and B
o D.
Neither Technician A or B
Correct Answer
B. Technician B
Explanation
Answer A is wrong. It would be the piston rings if the readings would
have increased.
Answer B is correct. If there is no change in the compression reading
after adding oil to the cylinder, the cylinder has a faulty valve.
Answer C is wrong. Technician B is correct.
Answer D is wrong. Technician B is correct.
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• 2.
An engine is making a kn
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