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ENGINE WILL NOT CRANK - CRANKSHAFT WILL NOT ROTATE as required. Worn, damaged, or improperly installed 1. Inspect the crankshaft bearings. 2. Inspect the crankshaft journals. 3. Repair or replace damaged components as required. Cause Correction Seized accessory drive system component 1. Remove accessory drive belts. 2. Rotate crankshaft by hand at the balancer or flywheel location. Hydraulically locked cylinder Coolant/antifreeze in cylinder Oil in cylinder Fuel in cylinder 1. Remove spark plugs and check for fluid. 2. Inspect for broken head gasket. 3. Inspect for cracked engine block or cylinder head. 4. Inspect for a sticking fuel injector. Seized automatic transmission torque 1. Remove the torque converter bolts. 2. Rotate crankshaft by hand at the balancer or flywheel location. Seized manual transmission 1. Disengage the clutch. 2. Rotate crankshaft by hand at the balancer or flywheel location. Broken timing chain and/or gears Inspect timing chain and gears. Repair as required. Seized balance shaft Inspect balance shaft. Repair as required. Material in cylinder Broken valve Piston material Foreign material Inspect cylinder for damaged Repair or replace as required. Seized crankshaft or connecting rod bearings Inspect crankshaft and connecting rod
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado
COOLANT IN COMBUSTION CHAMBER bearings. Repair as required. Bent or broken connecting rod Inspect connecting rods. Repair as required. Broken crankshaft Inspect crankshaft. Repair as required. Cause Correction DEFINITION: Excessive white smoke and/or coolant type odor coming from the exhaust 1. A slower than normal cranking speed may indicate coolant entering the combustion chamber. Refer to Engine Will Not Crank - Crankshaft Will Not Rotate. 2. Remove the spark plugs and inspect for spark plugs saturated by coolant or coolant in the cylinder bore. 3. Inspect by performing a cylinder leak-down test. During this test, excessive air bubbles within the coolant may indicate a faulty gasket or damaged component. 4. Inspect by performing a cylinder compression test. Two cylinders "side-by-side" on the engine block, with low compression, may indicate a failed cylinder head gasket. Cracked intake manifold or failed gasket Replace the components as required. Faulty cylinder head gasket Replace the head gasket and components as Warped cylinder head Machine the cylinder head to the proper Cracked cylinder head Replace the cylinder head and gasket. Cracked cylinder liner or engine block Replace the components as required.
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado
COOLANT IN ENGINE OIL ENGINE COMPRESSION TEST 1. Ensure that the vehicle batteries are in good condition, and fully charged. 2. Operate the vehicle until the engine is at normal operating temperature. 3. Disconnect the positive ignition coil wire plug from the ignition coil. 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 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 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 3. Inspect by performing a cylinder compression test. Two cylinders "side-by-side" on the engine block with low compression may indicate a failed cylinder head gasket. Faulty external engine oil cooler Replace the components as required. Faulty cylinder head gasket Replace the head gasket and components as Warped cylinder head Machine the cylinder head to proper flatness, 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 Chevrolet Silverado 1500 2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado
4. Disconnect the fuel injector electrical connector. 5. Remove all of the spark plugs. 6. Block the throttle linkage wide open. 7. Install the engine cylinder compression gage to the cylinder being tested. 8. Using the vehicle starter motor, rotate, or crank the engine for 4 compression strokes, or puffs, for the cylinder being tested. If the engine rotates for more than 4 compression 9. Record the compression reading. 10. Remove the engine cylinder compression gage from the cylinder being tested. 11. Repeat steps 8-11 for each additional cylinder. All cylinders must be tested to obtain valid test results. 12. If any cylinders have low compression, inject approximately 15 ml (1 oz) of engine oil into the cylinder through the spark plug hole. 13. Repeat steps 8-11 for all low compression cylinders. 14. The minimum compression in any one cylinder should not be less than 70 percent of the highest cylinder. No cylinder should read less than 690 kpa (100 psi). For example, if the Normal The compression builds up quickly and evenly to the specified compression. Piston rings leaking Compression is low on the first compression stroke. The compression builds up on the Valves leaking Compression is low on the first compression stroke. The compression does not build up NOTE: Do not insert objects into the throttle plate opening. Damage to
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado
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