OK, more information = different answer. If you need to move the lever on the valve more than a small amount, than it may need to be rebuilt. That was the problem with mine and I replaced it. The valve on the 123 can be rebuilt the 124 cannot, so says MB. I have not had time to take my old valve apart yet to see if I can repair it.

__________________
1987 300TD 309, xxx 2.8.2014 10,000 mile OCI


Be careful of the toes you step on today, as they may be connected to the ass you have to kiss tomorrow. anonymous

“Be who you are and say what you feel, because those who mind don’t matter, and those who matter won’t mind.” Dr. Seuss