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Fig. 24: Measuring Engine Compression 5. Measure the engine compression, using the following procedure: 1. Firmly install J 38722 to the spark plug hole. See Special Tools. 2. Have an assistant crank the engine through at least four compression strokes in the testing cylinder. 3. Check and record the readings on J 38722 at each stroke. See Special Tools. 4. Disconnect J 38722 . See Special Tools. 5. Repeat the compression test for each cylinder. 6. Record the compression readings from all of the cylinders. A normal reading should be approximately 1482 kPa (215 psi).
2006 Hummer H3 2006 ENGINE Engine Mechanical - 3.5L (L52) - H3
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