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COOLANT IN ENGINE OIL ENGINE COMPRESSION TEST 1. Charge the battery if the battery is not fully charged. 2. Disable the ignition system. Cracked cylinder liner or engine block Replace the components, as required. Cylinder head or engine block porosity Replace the components, as required. Cause Correction DEFINITION: Foamy or discolored oil or an engine oil overfill condition may indicate coolant entering the engine crankcase. Low coolant levels, an inoperative cooling fan, or a faulty thermostat may lead to an overtemperature condition which may cause engine component damage. Contaminated engine oil and oil filter should be changed. 1. Inspect the oil for excessive foaming or an overfill condition. Oil diluted by coolant may not properly lubricate the crankshaft bearings and may lead to component damage. Refer to Lower Engine Noise, Regardless of Engine Speed. 2. Inspect by performing a cylinder leak-down test. During this test, excessive air bubbles within the cooling system may indicate a faulty gasket or damaged component. 3. Inspect by performing a cylinder compression test. 2 cylinders side-by-side on the engine block with low compression may indicate a failed cylinder head gasket. Refer to Engine Compression Test. Faulty external engine oil cooler Replace the components, as required. Faulty cylinder head gasket Replace the head gasket and components, as required. Refer to Cylinder Head Cleaning and Inspection and Cylinder Head Replacement - Left Side or Cylinder Head Replacement - Right Side. Warped cylinder head Machine the cylinder head to proper flatness, if applicable, and replace the cylinder head gasket. Refer to Cylinder Head Cleaning and Inspection. Cracked cylinder head Replace the cylinder head and gasket. Cracked cylinder liner or engine block Replace the components, as required. Cylinder head, block, or manifold porosity Replace the components, as required.
2008 Hummer H2 2008 ENGINE Engine Mechanical - 6.2L - H2
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