leak down test
A leak down test checks if air is leaking from an engine's cylinders. It helps find problems like broken parts that can cause the engine to run poorly.
A leak down test is a diagnostic procedure used to assess the condition of an engine's cylinders. It measures how much air escapes from the cylinder when it is pressurized, helping to identify issues like worn piston rings, damaged valves, or faulty gaskets.
Hear It Discussed
"have you done a leak down test? Not a compression test, but a leak down test to see if all the cylinders are sealing?"
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"...but Ron, I had good leak down. I understand that. But this seems to be a random problem."
Ron Ananian, The Car Doctor - February 14, 2026 - Hour 1- A Mechanics Worst Nightmare Ron Ananian The Car Doctor
"Yeah, but didn't he do a leak down test not that long ago, which would have involved rotating the engine? I think he did a leak down test it when it first broke down,"
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