Snap-on Leak Down Tester - Dual Gauge

[Bruce Noland]

First time user for this little device. Did everything according to instructions. But there is problem. I can hear a small amount of air leaking past the rings when the leak down gauge is showing an improbable 0% leakage. Anybody else have this problem?

[Glenn Briglio]

Originally Posted by Bruce Noland

First time user for this little device. Did everything according to instructions. But there is problem. I can hear a small amount of air leaking past the rings when the leak down gauge is showing an improbable 0% leakage. Anybody else have this problem?

My bad Bruce I have the single gauge snap on leak down tester . I have problems getting consistent readings on same cylinder.

[Bruce Noland]

Thanks Glenn. Kind of surprising that Snap-on would have their name on a bad piece of equipment.

[Alan Roehrich]

I've had mine about 30 years, it works fine. Realize it is not a medical grade instrument, nor is it a certified instrument. But then, it doesn't cost that much, either.

It is very sensitive to inlet air pressure. Mine does not like anything over 100 psi.

[Mark Yacavone]

Bruce, I don't don't think those regulator type gauges work real accurately with little or no air going through them.
Try loosening up the plug till it reads and then back it back down..
You probably have about 2 % :-)

[Ed Wright]

I still have an old Sun percentage of leakage tester, one gauge. I have never seen one of those cheaper two gauge units I thought was correct. No two appear to give the same numbers. Usually low. I have seen 2% on those when you can hear air out of the crank case breather. My Sun would show 6% to 8% on the same cylinder. Only thing that would show 2% on mine would be some Total Seal gapless rings. Also had one built into one of my big Sun engine Analyzers, both read the same. Be worth it if you could find one.