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Jul 21st, 2025 | | | | Joined: Feb 2012 Posts: 504 'Bolter | | 'Bolter Joined: Feb 2012 Posts: 504 | I picked up a new vacuum gauge from HF about 8 months ago. Never had the need to use it. I recently rebuilt the carb in my 58 Burb so I decided to see what the vacuum was like.
The gauge seems to work ok. It registered a pretty steady 18 inches of vacuum. My problem is that the gauge doesn't go down to 0. Right out of the box it says 10 inches. The vacuum reading was actually just below the peg past 28 inches. I subtracted the 10 to get the 18 reading.
There doesn't seem to be any adjustment. Does anyone know if there is a way to 0 the gauge. I thought it might work like a compression gauge where you have to release the pressure between cylinders. There isn't anything in the very limited instructions that came with it. I'm confused!
Thanks
Larry
| | | | | Joined: Jan 2008 Posts: 4,903 'Bolter | | 'Bolter Joined: Jan 2008 Posts: 4,903 | The gauge should be at 0 and if it rests at 10 you can't really trust it. I would figure it was new defective, and there is no recalibrating it. I doubt that HF will take it back after 8 months. You will probably wind up buying a new one. | | | | | Joined: Jun 2012 Posts: 1,747 'Bolter | | 'Bolter Joined: Jun 2012 Posts: 1,747 | It got dropped somewhere between China and you. It is not repairable at this station. Got to get a new one. It should read 0 when not hooked up. And it is not a precision thing any way. Just a "kinda close sort of" thing. It will work for our application. A thought, will the glass cover rotate? If it will then you might get it off and remount the needle. At the 0 position. Still won't be real accurate but you could use it. Hey, if it breaks you aren't out much cause it was broke before you messed with it...:)
Steve H
| | | | | Joined: Feb 2012 Posts: 504 'Bolter | | 'Bolter Joined: Feb 2012 Posts: 504 | Gentlemen;
Roger. That's what I was afraid of. Maybe I'll try tinkering with it a little. As you said, it's already broke so there's only one way to go.
Thanks
Larry
| | | | | Joined: Feb 2012 Posts: 504 'Bolter | | 'Bolter Joined: Feb 2012 Posts: 504 | Good news. I fixed the gauge. Turns out the protective rubber casing and the plastic face plate are removable. I peeled the cover off and then carefully pried the faceplate off. There is a small flat tip screw on the face of the gauge right above the number 15. Turning that screw adjusted the needle. I couple of turns had it right on 0. Saved me having to buy a new gauge!!
Thanks
Larry
| | | | | Joined: Jun 2012 Posts: 1,747 'Bolter | | 'Bolter Joined: Jun 2012 Posts: 1,747 | The best fix is a free fix. Good work!
Steve H
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