It's not a huge deal to replace the lifter, assuming that you can determine which one is bad. They slide into the rockers and you remove the rockers in pairs. There are four bolts per pair.

There is a special tool for measuring the pre-load of the lifters, and different size valve pads are available to adjust it.

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Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe