W210 4.2 lifter noise

[kennygss]

My 97' E420 has that intermittent lifter noise. Here is the question. Is there a way to isolate the cylinder, or do you replace the whole bank, and if thats the case, should you just replace them all? Is that a doable project. And lastly, is there anything else that might emulate that sound (timing chain, clogged oil supply, low oil pressure) Thanks in advance for any info.