I say replace that EHA and drive it until the tranny blows. Then part it out.

I tried replacing the o-rings on the EHA and it made no difference. Others have reported the same things. You need a new one. Order it and we can go from there getting the thing to run properly.

__________________
'90 300SE 298k
-300K and it gets put into retirement.
'80 300D 255k Purchased new by family in 1980.

Had a:
1973 220 (gas)
1980 300SD
1992 400E