Vacuumpomp

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Project Vacuumpomp
Rebuilding a vacuum pump
Status In progress
Contact thomas
Last Update 2021-07-21

Leybold Trivac D8B

We need a roughing pump for our turbos. I bought this unit a while ago, and it works, but it also makes funny noises.

Plan

It needs to be opened up. I may have to fabricate and/or purchase some new parts to get it back to a more usable state.

Teardown / Rebuild

Lessons learned so far:

  • For those who wish to replace the shaft seals without being extorted by Leybold, they are regular FKM GR 15x24x6.5 SS 304 spring oil seals. Available as a general commodity item.
  • Do not try to replace the gas ballast seal unless absolutely necessary. It is very hard to remove from the deep, blind hole. It also incorporates an internal metal ring, making cutting the seal out impossible. See gallery photo above. It took me three hours to remove it without damaging the seat, with a combination of solvents, a scalpel and a hemostat. Don't be me, leave it be.
  • Use a special driver to install the new shaft seal. I designed one, you can find the STL here.
  • If the vanes seem a bit loose when dry, like they have too much play in the rotor slots and wobble around a bit, don't worry. Once there is an oil film in-between the vanes and the rotor surface, they'll be just fine.