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Test Procedure 1. Disconnect the battery ground negative cable. 2. Remove the spark plugs. Refer to Spark Plug Replacement . 3. Rotate the crankshaft to place the piston in the cylinder being tested at top dead center (TDC) of the compression stroke. 4. Install the J 35667-A , or equivalent. 5. Apply shop air pressure to the J 35667-A and adjust according to the manufacturers instructions. 6. Record the cylinder leakage value. Cylinder leakage that exceeds 25 percent is considered excessive and may require component service. In excessive leakage situations, inspect for Air leakage noise at the throttle body or air inlet hose that may indicate a worn or Air leakage noise at the exhaust system tailpipe that may indicate a worn or burnt Air leakage noise from the crankcase, oil level indicator tube, or oil fill tube that may Air bubbles in the cooling system may indicate a damaged cylinder head or a damaged 7. Perform the leakage test on the remaining cylinders and record the values. OIL CONSUMPTION DIAGNOSIS Cracked or damaged engine block CAUTION: Refer to Battery Disconnect Caution . IMPORTANT: It may be necessary to hold the crankshaft balancer bolt to prevent the crankshaft from rotating. Checks Causes Excessive oil consumption, not due to leaks, is the use of 1 L (1 qt) or more of engine oil
2008 Hummer H3 2008 ENGINE Engine Mechanical - 5.3L - H3
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