BenzWorld Senior Member
Date registered: May 2007
Vehicle: 64' 220SEc, 72' 300SEL 6.3, lots of parts
Location: San Diego/Spring Valley
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Those four bolts are delicate but hi strength. Tighten by feel rather than torque. use 1/4" drive sockets go around and around until you cannot get any more rotation.
Make sure the mating surfaces have been flattened with 150 grit wet-or-dry with WD-40 on a piece of plate (flat) glass, sand until surfaces show no distortion marks (about the bolt holes) wash grit thoroughly out..
You can also do the gear vanes with same paper until all scratches are gone.
I've never had to buy a new oil pump for these cars.
Rebuild it right.
(Warren I have the pump bracket attach bolts)