Harmonic Balancer - Crankshaft Pulley: Service and Repair
Crankshaft Balancer Replacement (LS7 and LS3 With Z52)
Special Tools
* EN 47812 - Installer Bolt
* J 41478 - Crankshaft Front Oil Seal Installer
* J 41665 - Crankshaft Balancer and Sprocket Installer
* J 41816 - Crankshaft Balancer Remover
* J 41816-2 - Crankshaft End Protector
* J 42386-A - Flywheel Holding Tool
* J 45059 - Angle Meter
Removal Procedure
1. Remove the air conditioning (A/C) drive belt. Refer to Air Conditioning Compressor Belt Replacement (w/o LS9) Air Conditioning Compressor Belt Replacement.
2. Remove the power steering gear. Refer to Steering Gear Replacement Service and Repair.
3. Remove the starter motor. Refer to Starter Replacement Service and Repair.
4. Remove the right transmission cover and bolt.
Caution: Refer to Fastener Caution Fastener Caution.
Note:
* Note the position of the crankshaft balancer before removal. The balancer does not use a key or keyway for positioning. Mark or scribe the end of the crankshaft and the balancer before component removal. The crankshaft balancer must be installed to the original position. If replacing the crankshaft balancer, note the location of any existing balance weights, if applicable. Crankshaft balance weights must be installed into the new balancer in the same location as the old balancer. A properly installed balance weight will be either flush or below flush with the face of the balancer.
* Do not use the crankshaft balancer bolt again. Install a NEW crankshaft balancer bolt during final assembly.
5. Install the J 42386-A - flywheel holding tool and bolts.
Use one M10 - 1.5 x 120 mm and one M10 - 1.5 x 45 mm bolt for proper tool operation. Tighten the J 42386-A - flywheel holding tool bolts to 50 Nm (37 lb ft).
6. Remove the crankshaft balancer bolt (139).
Do not discard the crankshaft balancer bolt. The balancer bolt will be used during the balancer installation procedure.
7. Mark or scribe the crankshaft balancer and the end of the crankshaft.
8. Use the J 41816 - crankshaft balancer remover (1) and the J 41816-2 - crankshaft end protector (2) in order to remove the crankshaft balancer.
9. Remove the crankshaft balancer (138).
10. Remove the crankshaft balancer washer.
11. Note the position of the crankshaft balance weights, if applicable. Refer to Engine Balancing Procedures and Crankshaft Balancer Cleaning and Inspection .
Installation Procedure
Note:
* Note the position of the crankshaft balancer before removal. The balancer does not use a key or keyway for positioning. Mark or scribe the end of the crankshaft and the balancer before removal. The crankshaft balancer must be installed to the original position. If replacing the crankshaft balancer, note the location of any existing balance weights, if applicable. Install new balance weights into the new crankshaft balancer, if applicable. Crankshaft balance weights must be installed into the new balancer in the same location as the old balancer. A properly installed balance weight will be either flush or below flush with the face of the balancer.
* The crankshaft balancer installation and bolt tightening involves a four stage tightening process. The first pass ensures that the balancer is installed completely onto the crankshaft. The second, third and fourth passes tighten the NEW bolt to the proper torque.
* The used crankshaft balancer bolt is used only during the first pass of the balancer installation procedure. Install a NEW crankshaft balancer bolt and tighten as described in the second, third and fourth passes of the balancer bolt tightening procedure.
1. Install the J 42386-A - flywheel holding tool and bolts.
Use one M10 - 1.5 x 120 mm and one M10 - 1.5 x 45 mm bolt for proper tool operation. Tighten the J 42386-A - flywheel holding tool bolts to 50 Nm (37 lb ft).
2. Using the old balancer as a reference, mark or scribe the new balancer in the same location, if applicable.
3. Install balance weights into the new balancer, if applicable. Refer to Engine Balancing Procedures and Crankshaft Balancer Cleaning and Inspection .
4. Install the crankshaft balancer washer (1) onto the crankshaft balancer.
Note: The balancer should be positioned onto the end of the crankshaft as straight as possible prior to tool installation.
5. Position the balancer (138) onto the end of the crankshaft.
6. Use the J 41665 - crankshaft balancer and sprocket installer (2) and the J 41478 - crankshaft front oil seal installer (1) in order to install the balancer.
1. Assemble the J 41478 - crankshaft front oil seal installer (1), nut, washer and the J 41665 - crankshaft balancer and sprocket installer (2).
Insert the smaller end of the J 41665 - crankshaft balancer and sprocket installer
into the front of the balancer.
2. Use a wrench and hold the hex end of the J 41478 - crankshaft front oil seal installer.
3. Use a second wrench and rotate the installation tool nut clockwise until the balancer is started onto the crankshaft.
4. Remove the J 41665 - crankshaft balancer and sprocket installer and reverse the installation tool.
Position the larger end of the J 41665 - crankshaft balancer and sprocket installer against the front of the balancer.
5. Use a wrench and hold the end of the J 41478 - crankshaft front oil seal installer.
6. Use a second wrench and rotate the installation tool nut clockwise until the balancer is installed onto the crankshaft.
7. Remove the balancer installation tool.
7. Install the used crankshaft balancer bolt (139) and tighten to 330 Nm (240 lb ft).
8. Remove the used crankshaft balancer bolt.
Note: The nose of the crankshaft should be recessed 2.4-4.48 mm (0.094-0.176 in) into the balancer bore.
9. Measure for a correctly installed balancer.
If the balancer is not installed to the proper dimensions, install the EN 47812 - installer bolt and the J 41665 - crankshaft balancer and sprocket installer and repeat the installation procedure.
10. Install the NEW crankshaft balancer bolt (139).
1. Tighten the crankshaft balancer bolt to 150 Nm (110 lb ft).
2. Loosen the crankshaft balancer bolt 360 degrees.
3. Tighten the crankshaft balancer bolt to 80 Nm (59 lb ft).
4. Tighten the crankshaft balancer bolt a final pass to 200 degrees using the J 45059 - angle meter.
11. Remove the J 42386-A - flywheel holding tool.
12. Install the starter motor. Refer to Starter Replacement Service and Repair.
13. Install the power steering gear. Refer to Steering Gear Replacement Service and Repair.
14. Install the A/C drive belt. Refer to Air Conditioning Compressor Belt Replacement (w/o LS9) Air Conditioning Compressor Belt Replacement.
15. Perform the crankshaft position (CKP) system variation learn procedure. Refer to Crankshaft Position System Variation Learn Testing and Inspection.