Detailed Notes: The GEBA and Bosch water pumps do not include the rear housing (reuse the housing from the old water pump assembly). O-rings for the bypass pipe are serviced separately. It is STRONGLY recommended that these o-rings (part #90 537 379) also be replaced during water pump installation.
Product Remark:- w/o Rear Housing
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Notes: Engine Water Pump -- Before removing the water pump it is recommended to install GM tool # J43651 or equivalent to keep the timing chain and gears properly synchronized.; This pump is driven off the timing chain. See vehicle manufacturer recommendation for replacement of timing components.