MityVac not so mighty anymore
Update: I disassemble, cleaned, and lubricated all the parts. I got it to "work" again except with my index finger over the main spigot tube: a) will only pump up to 25 (dial scale shows 0-30) and b) with my finger still firmly on the spigot, the dial immediately begins to drop (albeit very slowly).
It's still good for checking engine vacuum, but not suitable for checking leak down of vacuum diaphragms.
At the end of the posted video, the guy states his problem leak was a small o-ring/gasket he removed at the very end of disassembly (near the handle). When I took off that same part, I found no such ring/gasket. At first I thought it dropped off but I could not find it. Then I thought perhaps it had completely disintegrated. However, I don't find that part in the blow-up diagram in the instructions nor in the correct advertised repair kit.
Update: I disassemble, cleaned, and lubricated all the parts. I got it to "work" again except with my index finger over the main spigot tube: a) will only pump up to 25 (dial scale shows 0-30) and b) with my finger still firmly on the spigot, the dial immediately begins to drop (albeit very slowly).
It's still good for checking engine vacuum, but not suitable for checking leak down of vacuum diaphragms.
At the end of the posted video, the guy states his problem leak was a small o-ring/gasket he removed at the very end of disassembly (near the handle). When I took off that same part, I found no such ring/gasket. At first I thought it dropped off but I could not find it. Then I thought perhaps it had completely disintegrated. However, I don't find that part in the blow-up diagram in the instructions nor in the correct advertised repair kit.