Engine Compression & Cooling System Tools

What does a Cylinder Leak-Down Tester do that a standard compression gauge cannot?

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 Correct IncorrectIt injects regulated shop air with the piston at Top Dead Center (TDC) on compression stroke. Listening where air hisses out (intake, exhaust pipe, oil filler, or radiator bubbles) helps identify the failing component.

What does a Cylinder Leak-Down Tester do that a standard compression gauge cannot?

• It tests the timing chain tension
• It measures fuel pump pressure
• It measures oil pressure while driving
• It pinpoints the exact location of leakage (intake valve, exhaust valve, piston rings, or head gasket)