Engine Repair (A1)Câu 14 / 120
A rhythmic knocking noise that is loudest under load and disappears when one cylinder is disabled most likely indicates:
a.A loose accessory belt
b.An exhaust leak
c.A sticking valve
d.A worn connecting-rod bearing on that cylinder
Giải thích
A rod bearing knock is load-sensitive and typically quiets when that cylinder's contribution is removed by disabling its injector or spark. Loose belts and exhaust leaks make different noises unrelated to individual cylinders. Excessive rod bearing clearance is confirmed with Plastigage during disassembly.
Luyện miễn phí toàn bộ 120 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- Blue smoke from the exhaust under acceleration most often indicates:
- Technician A says timing-chain stretch can retard valve timing and set a camshaft/crankshaft correlation code. Technician B says a stretched timing chain has no effect on engine performance. Who is correct?
- Head bolts that use a torque-to-yield (TTY) design should be:
- The main function of engine oil, besides lubrication, includes all of the following EXCEPT:
- Coolant is leaking internally and the engine oil appears milky. The MOST likely cause is:
- Before final assembly, plastigage is used to measure:
Cập nhật gần nhất: · quy trình kiểm tra
Đội Ngũ Biên Tập PrepPass · Đối chiếu với ASE Automobile Certification Series (A1–A8) · Quy trình kiểm tra