The strainer is located in the oil pan anf it it is parially clogged, you might not notice it unlesss you have a oil pressure gauge which might drop in pressure at high speed. If it is badly clogged, the oil pressure indicator lamp should turn on or flicker.
To check on the status, the oil pan would have to come off.
The valve lifters are located under the valve cover. Refer to Fig 21 & 21a. Items 14 & 17 are the hydraulic lash adjusters. They are moving components under stress so wear can occur resulting in emission of noise. However if it is due to wear, the noise would be rather consistent and not fade away intermittently.
When there is sufficient oil pressure and lubrication, there would be minimal noise.
Images (click to enlarge)
Thursday, December 2nd, 2010 AT 12:33 PM