Noisy valves and lifters

That noise they're referring to is a slight rattle that only lasts for a few seconds at engine start-up. It is caused by oil draining down out of some of the passages when the engine is stopped. Some oil filters do not have an internal check valve to prevent that. Normally that is not a serious problem. Ford has had some problems with wear on the ends of the pushrods causing a clicking sound but since this problem seems to have started suddenly, the best place to start is by having the oil pressure tested with a mechanical gauge. If it is low, addressing that problem will solve the noise problem. If pressure is normal, have an experienced mechanic listen to the noise to help determine what is causing it. Oil additives should not be necessary if you use good-quality oil. They won't solve mechanical problems either if that's what it turns out to be.

I had luck quieting mine down using LUCAS oil stabilizer.

Do you know what was causing the noise? Was it worn parts or just high mileage in general?

Not real high mileage(125k) only a couple were noisy at start up 1 very noticeably. Gm 3.1 v6.

There isn't a way to tighten the lifter. These engines usually have nosies from the timing chains and the oil passages in the timing chain guides/tensioner.

VALVE CLEARANCE
NOTE:All models are equipped with hydraulic valve lifters; valve adjustment is not required. If valves are noisy or incorrect clearance is suspected, worn components are indicated. Check collapsed valve lifter clearance. See appropriate article in ENGINES.

Oil Pressure
Normal oil pressure at 2000 RPM should be 40-60 psi (2.8-4.2 kg/cm2 ) with engine at normal operating temperature.

You need to list the engine size when you have an engine-related problem. If the oil level is okay, you might want to try a different brand of oil filter. There needs to be a check valve in the system to prevent oil from draining out of the pump and pick-up tube when the engine is stopped. On some engines that check valve is in the oil filter. Some oil filters do not have that valve.

Hello,

It will depend on the engine type.

If it is SOHC it has Hydrolic Lash Adjuster and would most likely be the lifter and they would need to be replaced.

If Push Rod Engine then it could be either the lifters, Weak Valve Springs, worn Rocker Arms or Bent Push Rods.

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