Chevrolet LT1 Water Pump Seal Tool (J39089)

thingiverse

I whipped up my own version of the J39089 tool using Solidworks after realizing that water pump seals on the LT1 V8 engine are extremely tough to install correctly without it. My initial design fit snugly, so I made some adjustments for the second version by increasing its inner diameter slightly. Although my first seal worked and allowed me to assemble the engine beforehand, this new version remains untested. It should be a perfect fit. UPDATE: I used another seal with a freshly printed PLA v2 (the first one was PETG), but the thin lip at the wide end broke and destroyed the seal. To fix this issue, I made the lip thicker for v3, which worked perfectly when printed in PLA. Print settings shouldn't have much of an impact; print in the default orientation with the narrow end facing down, and don't add any supports. It's a good idea to use a brim since the bottom is relatively small in surface area.