Engine Repair (A1)Question 7 of 120
Technician A says low oil pressure only at idle on a high-mileage engine can be caused by worn bearing clearances. Technician B says a worn oil pump or diluted oil can also lower pressure. Who is correct?
a.Technician A only
b.Technician B only
c.Both A and B
d.Neither A nor B
Explanation
Worn bearing clearances let oil escape faster than the pump maintains pressure at low speed, and a worn pump or fuel-diluted oil reduces pressure as well. Both technicians are correct. Verify with a mechanical gauge before condemning parts.
Practice all 120 questions free — no signup required.
Related questions on this topic
- On an overhead-cam engine, excessive valve lash (clearance) most commonly produces which symptom?
- Technician A says the PCV system routes crankcase blow-by vapors into the intake to be burned. Technician B says a stuck PCV valve can cause rough idle or oil leaks. Who is correct?
- A mechanic measures cylinder taper by comparing bore diameter at the top of ring travel to the bottom. This measurement is taken with a:
- Which cooling-system component regulates coolant flow based on engine temperature?
- A radiator pressure cap raises the system's boiling point primarily because:
- Blue smoke from the exhaust under acceleration most often indicates:
Last reviewed: · editorial process
PrepPass Editorial Team · Verified against ASE Automobile Certification Series (A1–A8) · How we review