Here are the photos I promised. No rocket science or special needs other than the right sockets, bits and extensions.
1.) Old pump (MB-104 200 4701) with hoses and sensors attached:
2.) Fan shroud, sensors and hoses removed:
3.) 1/4" ratchet and 7/32"hex bit socket inserted directly into the upper-left bolt. This is the only bolt that bit worked on because it was the cleanest, and I was able to apply the most force. In this configuration, the extending bolt backed the ratchet into the thermostat housing and the tool got stuck. Tightening the bolt back in was the only way to release it:
4.) Alternative to above: Hex bit on a universal joint and extension. Wont turn much at near 90 degrees but then, it does not have to because once these bolts are cracked loose you can unscrew them with your fingers:
5.) 3/8" drive and extension with hex bit in upper right bolt. Straight shot, no wobble needed. If you have the allen head bolts, this is where the rounding will likely begin and you must use a bolt-out. If you have 13mm hex heads, you should be fine:
6.) 3/8" drive and extension with hex bit in lower right bolt. A wobble could help but was not needed. Repeat for lower left bolt.
7.) Pump lifted out and set atop valve cover. Note the brown gunk regurgitated from the block -- some of which is oil from a previous head gasket breach. That, combined with blown-back oil grime from my timing cover leak makes my engine bay look rather awful:
8.) New pump -- Aftermarket with OEM reference 104 200 4901 which cross references to 104 200 4701. Came with mod kit to close unneeded oil cooler outlet in the rear. Has one sensor port on top and one on the side:
9.) New pump installed -- after pre-assembling with pulley, sensors, thermostat and t-stat housing. Coolant temperature sensor to dashboard now sticks out horizontally. The other one remains as was:
