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.
Detailed Notes: This Water Pump does NOT include the Rear Housing, please reuse the Rear Housing from the old Water Pump. It is STRONGLY recommended to replace the 2-O-rings for the pipe between the water pump and the thermostat housing, these O-rings need to be purchased separately under part number 90 537 379.