What is the scoop with the Water Pump and cooling pipe mounting. I have changed plenty of water pumps, but never on a MB w115. Tell me about the large, threaded sleeves with a bolt that appears to run through? Not sure what I am looking at, or how they work. I believe I have a leak from behind the water distribution housing, and I would like to have better access to cleaning up the pipe ends that the hose attaches to. Will replace the pump and gaskets.

Anything I should know about the process of removing the pump and the part behind the pump?

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1969
Model 220 gasoline
Chassis: W115.010