At least on the M116 that I have apart, there is only the one hole near the top of the hole where you screw the HLC into the head.

The HLC is pressurized by an oil flow through that hole and the one in the HLC itself. And this pressure holds the rocker against the cam and provides a bit of cushion as the valve opens, keeping things quiet.

The thrust washers come in seven thicknesses starting at 3.7 mm and going up to 6.15 mm in .35 mm increments. So that is a difference of 2.45 mm. The measuring device has a 1.2 mm groove and you are supposed to be in the top .6 mm of it. All of this to say that IMHO if you are more than two sizes off on the thick side you would probably be keeping the valve open.

BTW, measured the cam lift while I was looking at the hole. About 6.5 mm, so the adjustment potential is about 40%, surely enough to keep the valve open if it's really screwed up.

__________________
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