Q: Knocking noise valve clatter

asked by on

My Tempo GL makes a knocking noise like valve clatter when I start it up and right before I shift it when driving from 60 – 70 mph. My number 1 connecting rod broke so I changed all of the rod bearings and the oil pump. But it didn’t help the knocking noise stop. I took the head off and on again, changed all of the lifters and still had the same problem. My push rods and rocker arms looked fine. Do you have any other ideas or suggestions?

Hello. It’s quite possible, even likely, that the crankshaft bearing journals are worn out of specification. Replacing the rod bearings only does not compensate for a worn crankshaft rod (or main) bearing journal. It’s also possible the oil pump pressure/volume are inadequate for your engine’s wear conditions. I would have a professional mechanic listen to, and check out the noise coming from your engine, and disassemble it further if needed to confirm the source of the knocking. A YourMechanic professional can help diagnose the noise and advise on repairs.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  1. Home
  2. Questions
  3. Knocking noise valve clatter

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Not turning over spinning - 1980 Mercedes-Benz 240D

Hello. It sounds like your starter is going bad and needs to be replaced. The starter solenoid is made onto the starter and is most likely causing the problem you are having. At some point the starter is going to...

Q: Need to find out how to set timing on balance shaft assembly.

Rotate the crank until the number 1 cylinder is at top dead center. Make sure to replace the adjustment shims exactly as they came out, on the seat faces of the balance shaft assembly. Line up the marks on the...

Q: My engine idles heavy 1/3 of the time

If the throttle is sticking open or the idle air control valve is sticking open, would account for the check engine light not coming on. The vehicle would have to be checked to make sure the throttle is not being...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.