Steps on how to do an engine leakdown test:

Step 1 : Remove the spark plugs and rotate the engine to put the cylinder to be tested at TDC. Tip: Insert a long screwdriver or extension into the spark plug hole and turn the engine by hand with a socket on the crankshaft. When the screwdriver stops rising or falling, you’re at TDC. Don’t turn the engine backward if TDC is missed. Go around again. In a four-cylinder engine, cylinders one and four and two and three are at TDC at the same time.

Step 2 : Figure out which spark plug adapter works best and connect the gauge into the hole. Put the vehicle in gear and set the parking brake to prevent the engine from turning when air is compressed into the cylinder. Start with the regulator turned counterclockwise to zero the incoming pressure. Connect compressed air. Turn the regulator clockwise to pressurize air into the cylinder.

Step 3 : Record leakage percentage for the cylinder. Remove the oil dipstick, radiator cap and oil filler cap. Open the throttle body or remove the air cleaner. Listen and watch. Wherever air is escaping will indicate where the problem is. Disconnect the gauge and move to the next cylinder.

Follow along as I teach you how to do engine leak down testing, whether you are an automotive technician or a DIY-er looking for tips us pros use.

Grab your tools, lets get ready, lets hit it!

#enginecompressiontesting #compressiontest

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