If you have any questions or concerns, please feel free to post them in the comments section below. Hopefully this guide has been helpful in answering any questions that you might have had about compression testing your diesel. 5.9 6BT The minimum psi spec for the 6BT is 350 psi.6.4 340-375 psi is the acceptable range for the 6.4L Powerstroke. ![]() 6.0 375-425 psi is the acceptable range for the 6.0L Powerstroke.7.3 365-475 psi is the acceptable range for the 7.3L Powerstroke.A huge red flag is more than 75% difference between the individual cylinders. Generally speaking, you’ll always want to look for the relative compression readings for all of the cylinders comparatively. Engines with a lot of miles will naturally have lower PSI because of all the wear and tear. Measures the condition of your head gaskets, piston. The gauge records incoming air pressure, and the right gauge records individual cylinder pressure - and the difference is you leakdown. Keep in mind that a lot of these are the specifications for these engines when new or rebuilt. This dual-gauge leakdown tester measures the condition of your head gaskets, piston rings, and valves. I’ve put together the PSI ranges that you should be looking for when doing your compression test. Repeat for all cylinders and compare pressures.Read and record the final PSI on the gauge.Using a test jumper or remote switch, activate the starter directly.Verify that ignition is disabled to prevent engine from starting.Ask us about any unit - we might be able to add it or find a replacement. Use the correct adapter to thread into the glow plug hole Transcat offers rental equipment for test & measurement, calibration and process control.Remove all glow plugs to reduce compression resistance. ![]()
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