After opening the garage door with the crowbar you can find the potential portal with your 4D glasses.

Oh yeah. The water has removed the tachyon from your clock hands. Where to get more, here?

Do you remember which machine got tachyon, also. Hint, check your inventory.

Yup, there's the old butter churner. Click the time machine key and open the hood. Use the crossbow on the motor. You can now activate the portal.