Damaged Compression Gauge. Never Underestimate a Noobs capacity to...

[JC-SuperJet]

Man, just this past Saturday. I loaned my trusty "Field" Compression Gauge that I've used for over 20 years and always gave consistent and accurate readings compared to a Snap-On up till now.

Guy was breaking brand new Rear NGK Spark Plugs every Moto on his Pump Gas Motor. Maybe Detonation, Fuel too Lean, too much Timing Advance, Crank out of phase, bad NGK Spark Plugs?

I didn't stick around to witness the tests 'cause Man gotta ride before the Covid gets me... And how complicated can a Compression Test be?

So later in the day, when I'm collecting my stuff, I recover my Compression Gauge and the Guy left it pressurized. Never bled the Air down after the last Test. So I released the Schrader Valve.

Now the Needle is stuck at 30 pounds Dog nabbit! How the hell did this Guy mangle my Gauge? How did He even dream of a way to do that? FJB

Do y'all think He forgot to bleed the Gauge after the 1st Test and then did the 2nd Test and "spun" the Needle with too much Total Pressure?

The Gauge Dial reads up to 300 psi and the Guy's Cylinders were in the 180 psi range. 2 x 180 > 300psi. Did 360 psi off the scale kill my Gauge?

Now I'll have to bring my Home Snap-On to the Lake, but I AND ONLY I WILL BE OPERATING IT 'cause apparently some People need to be Certified before operating a Compression Gauge.

Also have a $250 PET Tachometer that I loaned to a Friend a couple of years ago. When I got it back, the Pick-Up Wire came 'Bandaged" in Red Electrical Tape. Dummy had been slamming his Blaster Hood on the Wire oblivious to the Pinch Points. Seemed like the "Guillotine Man" was hell bent on cutting that wire.

 

[Yami-Rider]

Ya, I've had bad luck loaning out tools, and somehow its never the users fault, just best not to let people barrow your stuff, unless they are willing to replace it, but good luck with that...

 

[Harbor]

Dang, that sucks. I agree, He should have bled the pressure out, leaving it pressurized is like leaving your torque wrench adjusted to 150 when not in use, it weakens the spring calibration…

To my knowledge, you cannot stack Readings, 180 psi is 180 psi, only way to go over 180 on a second test is to produce over 180 psi on that test..

 

[fx1mark]

I had a compression guage for many years that I could trust and then it began to give me erratic readings. I replaced the shrader valve and I bought a guage from harbor freight. I compared the readings this guage gave me with a friends guage that I know is good and they were within a few pounds of each other. My only compaint is the guage is small but it's inexpensive.

300 PSI 1/4 in. NPT Dry Gauge

Amazing deals on this 300 Psi 1/4 Npt Dry Gauge at Harbor Freight. Quality tools & low prices.

www.harborfreight.com

 

[ngerk]

Just recalibrate the gauge. YouTube it, it’s very easy to do. I bought a snap on gauge really cheap recently because it was about 20 psi off and I calibrated it. It’s dead on with my cheaper tester.

 

[bored&stroked]

My tools only get loaned to people that work with tools for a living.