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Missing or loose balance weights Imbalance caused by heat distortion or fluid contamination CLUTCH PLATE DIAGNOSIS COMPOSITION PLATES Dry the plates and inspect the plates for the following conditions: Pitting Flaking Delamination-splitting or separation of bonded clutch material Wear Glazing Cracking Charring Chips or metal particles embedded in the lining Replace a composition plate which shows any of these conditions. STEEL PLATES Wipe the plates dry and check the plates for heat discoloration. If the surfaces are smooth, even if CAUSES OF BURNED CLUTCH PLATES The following conditions can result in a burned clutch plate: Incorrect usage of clutch or apply plates Engine coolant or water in the transmission fluid A cracked clutch piston Damaged or missing seals Low line pressure Valve body conditions The valve body face is not flat. Porosity is between channels.
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
The valve bushing clips are improperly installed. The checkballs are misplaced. The Teflon® seal rings are worn or damaged. ENGINE COOLANT/WATER IN TRANSMISSION If antifreeze or water has entered the transmission, perform the following: 1. Disassemble the transmission. 2. Replace all of the rubber type seals (the coolant will attack the seal material which will cause leakage). 3. Replace the composition-faced clutch plate assemblies and the 2-4 band assembly (the facing material may separate from the steel center portion). 4. Replace all of the nylon parts (washers). 5. Replace the torque converter. 6. Thoroughly clean and rebuild the transmission, using new gaskets (bonded and non bonded), and oil filter. 7. Flush the cooler lines after the transmission cooler has been properly repaired or replaced. FLUID LEAK DIAGNOSIS GENERAL METHOD 1. Verify that the leak is transmission fluid. 2. Thoroughly clean the suspected leak area. 3. Operate the vehicle for 24 km (15 mi), or until normal operating temperatures are reached. 4. Park the vehicle over clean paper or cardboard. 5. Shut OFF the engine. 6. Look for fluid spots on the paper. 7. Make the necessary repairs. POWDER METHOD NOTE: The antifreeze or water will deteriorate the seals, gaskets and the
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
1. Thoroughly clean the suspected leak area with solvent. 2. Apply an aerosol type powder, such as foot powder, to the suspected leak area. 3. Operate the vehicle for 24 km (15 mi), or until normal operating temperatures are reached. 4. Shut OFF the engine. 5. Inspect the suspected leak area. 6. Trace the leak path through the powder in order to find the source of the leak. 7. Make the necessary repairs. DYE AND BLACK LIGHT METHOD A fluid dye and black light kit is available from various tool manufacturers. 1. Follow the manufacturer's instructions in order to determine the amount of dye to use. 2. Detect the leak with the black light. 3. Make the necessary repairs. FIND THE CAUSE OF THE LEAK Pinpoint the leak and trace the leak back to the source. You must determine the cause of the leak Gaskets Fluid level/pressure is too high Plugged vent or drain-back holes Improperly tightened fasteners Dirty or damaged threads Warped flanges or sealing surface Scratches, burrs, or other damage to the sealing surface Damaged or worn gasket Cracking or porosity of the component Improper sealant used, where applicable Incorrect gasket Seals
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Fluid level/pressure is too high Plugged vent or drain-back holes Damaged seal bore Damaged or worn seal Improper installation Cracks in component Manual or output shaft surface is scratched, nicked, or damaged Loose or worn bearing causing excess seal wear Damaged ISS O-Ring POSSIBLE POINTS OF FLUID LEAKS Transmission Oil Pan Incorrectly tightened oil pan bolts Improperly installed or damaged oil pan gasket Damaged oil pan or mounting face Incorrect oil pan gasket Case Leak Damaged or missing fill tube seal Mislocated fill tube bracket Damaged vehicle speed sensor seal Damaged manual shaft seal Loose or damaged oil cooler connector fittings Worn or damaged propeller shaft oil seal Loose line pressure pipe plug Warped Distorted torque converter housing Porous casting Leak at the Torque Converter End Converter leak in the weld area Converter seal lip cut. Check the converter hub for damage
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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