GM 12555640
Drive Plate

Engine Flywheel replacement starts by removing an automatic transmission when present while marking the engine Flywheel position before extraction. Start by removing engine Flywheel bolts after which you should remove the automatic transmission engine Flywheel. Inspection and cleaning of the engine Flywheel should be followed by inserting 2 m11x1.5 mm bolts with clock-wise rotation through the spacer holes at the Crankshaft rear until the spacer fully removes itself. You should install automatic transmission engine flywheels after positioning the spacer (if present) at the Crankshaft rear end. Applications requiring a Flywheel spacer must use extended Flywheel bolts while applying threadlock gm p/n 12345382 (Canadian P/N 10953489) or an equivalent to the bolt threads. Staremen engine Flywheel bolt torquing should be performed in specific stages at 20 nm (15 ft. Lbs.), 50 nm (37 ft. Lbs.) then 100 nm (74 ft. Lbs.). The automatic transmission needs to be reinstalled after securing the Flywheel.

The first step towards engine Flywheel replacement involves removing the transmission based on specifications that match between the 4l60-e/4l65-e/4l70-e, 4l50/4l80/4l90, or allison transmission model requirements. Install the Flywheel holding tool (J 44643) before beginning Flywheel security. Workers handling the component should use gloves due to the presence of dangerous sharp edges. The procedure requires you to remove all Flywheel bolts before eliminating both Flywheel washer and Flywheel from the system. The tapered section on the Flywheel teeth should face toward the Starter before installing the Flywheel washer which has its bevelled side facing the engine. Apply caution during installation because the bolts come with a preinstalled molybdenum disulfide coating to provide lubrication yet no additional lubricant should be added to these bolts because this facing can influence torque and clamp load which may damage your engine. The new Flywheel bolts need installation according to this order: apply torque to 79 nm (58 lb ft) during the first pass followed by a second pass achieving a 60-degree angle with the angle meter (J 45059) and then complete the third pass by extending 60 more degrees with the same angle meter (J 45059). Reinstall the transmission per model specifications after you have removed the Flywheel holding tool (J 44643) from the system.

The procedure for engine Flywheel replacement starts with uninstalling automatic transmission units and continuing with clutch removal in cases where present. The next step requires you to remove the Flywheel bolts which should be followed by taking out the Flywheel (1 or 2). Remember to track how the Flywheel weights are placed before removing the manual vehicle transmission since these weights guide future assembly. A proper examination should be conducted on the Flywheel followed by necessary cleaning steps. A new Flywheel installation requires specific attention to manual transmission Flywheel weights which should be noted down because weights of matching lengths need to be installed in corresponding original positions. The installed new Flywheel weights ought to touch the Flywheel surface at a level point or just slightly lower. The installation of the Flywheel (1 or 2) must be done by positioning its locator hole toward the Flywheel locator pin. Use the specified order to install Flywheel bolts while tightening them to 100 nm (74 ft. Lbs.). The installation process ends with the restoration of both clutch components when present and any installed automatic transmission systems in place.

A technician should start the Flywheel replacement procedure by taking out the automatic transmission while recording the engine Flywheel position and direction. After removing the engine Flywheel bolts proceed with removing the automatic transmission engine Flywheel. Afterward clean the engine Flywheel for inspection. Move on to the next step only when you need to apply 2 m11x1.5 mm bolts to the threaded spacer holes before using a clockwise rotation to detach the spacer and removing it from the Crankshaft rear. Put the spacer (if needed) on the Crankshaft rear and install the automatic transmission engine Flywheel as the final step. When using a Flywheel spacer with an application you should use longer bolts specifically designed for such needs and apply gm p/n 12345382 threadlock (Canadian P/N 10953489) or equivalent to the Flywheel bolt threads. You need to tighten the engine Flywheel bolts in this specified order: begin at 20 nm (15 ft. Lbs.), move to 50 nm (37 ft. Lbs.), and complete at 100 nm (74 ft. Lbs.). Continue with the automatic transmission reinstallation process after finalizing the described procedures.

The first step to replace an automatic transmission flex plate requires removing the transmission while recording engine Flywheel position prior to its removal. Take out all Flywheel bolts followed by the removal of the Flywheel. Two m11x1.5 mm bolts should be inserted into the threaded holes of the spacer before spinning them clockwise to detach the spacer from the Crankshaft rear. Apply longer Flywheel bolts when installing the spacer on Crankshaft assembly only if a spacer is currently in place. Install the Flywheel to the Crankshaft while applying threadlock to the Flywheel bolts according to specified part number for adhesives, fluids, and lubricants, sealers. Use the correct sequence when tightening the Flywheel bolts by applying 20 nm (15 lb ft) force first followed by 50 nm (37 lb ft) and finally reaching 100 nm (74 lb ft). The automatic transmission should go back into place after this process.

An engine installation process starts with transmission removal followed by recording both the engine Flywheel positioning and its direction before extraction. Pull out both Flywheel bolts followed by the removal of the Flywheel. The spacer should be taken out of the Crankshaft's rear by applying clockwise torque to two m11 x 1.5 mm bolts installed into threaded spacer holes. Begin installation by setting the spacer on the Crankshaft rear before installing the Flywheel and Crankshaft bolts while using longer bolts if a spacer exists. Treat the Flywheel bolt threads with threadlock gm p/n 12345382 (Canadian P/N 10953489) or an equivalent solution. The sequence for tight Flywheel bolt adjustment includes initial torque to 20 nm (15 ft. Lbs.) followed by 50 nm (37 ft. Lbs.) then final tightening to 100 nm (74 ft. Lbs.). Reassembly of the transmission becomes possible after following this process.

Tighten the flywheel bolts in the specified sequence to 100 Nm (74 ft. lbs.).

Next, take out the flywheel bolts and then remove the flywheel (1 or 2).

Install the flywheel and bolts onto the crankshaft, applying threadlock to the threads of the flywheel bolts, using the correct part number for the adhesive.

Place the spacer (if applicable) onto the rear of the crankshaft, then install the automatic transmission engine flywheel.

Clean and inspect the engine flywheel.

Install the flywheel bolts and tighten them in the specified sequence to 100 N.m (74 lb ft).

Install the flywheel (1 or 2) by aligning the flywheel locator hole to the flywheel locator pin.

Ensure that the position and length of the original flywheel weights are noted, as flywheel weights of the same length must be installed in the same location on the new flywheel.