Balance Shaft: Service and Repair
BALANCE SHAFT REPLACEMENT
Remove
Tools Required:
J 23523-E Torsional Damper Puller and Installer.
J 26941 Needle Bearing Remover
J 38834 Balance Shaft Bearing Service Kit.
1. Negative battery cable.
2. Air cleaner and air intake duct.
- Drain the cooling system.
3. Discharge A/C system.
4. Upper radiator shroud.
5. Oil cooler lines at the radiator.
6. Transmission cooler lines at the radiator.
7. Upper radiator hose.
8. Heater hose and overflow hose from radiator.
9. Lower radiator hose.
10. Radiator.
11. A/C condenser.
12. Fan assembly.
13. Multiple ribbed belt.
14. Pencil brace at coolant pump.
15. Coolant pump.
16. Torsional damper. Use J23523-E.
17. Flywheel inspection cover.
- Drain engine oil.
- Loosen the oil pan. Remove the two nuts and the first two bolts on either side at the front of the oil pan, all other oil pan fasteners must be very loose.
18. Front cover bolts and front cover.
Important
- Use care when removing the front cover from the front of the oil pan gasket.
19. Crankshaft front oil seal from the front cover.
20. Timing chain bolts.
21. Timing chain, camshaft sprocket, and balance shaft drive gear.
22. Balance shaft driven gear.
23. Balance shaft retainer.
24. Intake manifold, as outlined in this section.
25. Lifter retainer.
26. Balance shaft and front bearing using a soft faced hammer.
27. Balance shaft rear bearing using J 38834 and J 26941.
Important
- The balance shaft and both bearings are serviced only as a complete package.
- Use only the correct tools for bearing and shaft installation.
- The front bearing must not be removed from the balance shaft.
- The balance shaft drive and driven gears are serviced only as a set. The set includes the balance shaft driven gear bolt.
Clean
- All traces of old gasket material from gasket sealing surfaces.
Inspect
- Balance shaft drive and driven gears for nicks and burrs.
Install
Tools Required:
J 23523-E Torsional Damper Puller and Installer.
J 38834 Balance Shaft Bearing Service Kit.
J 36996 Shaft Installer
J 8092 Driver Handle
J 35468 Crankshaft Seal Installer
1. Balance shaft rear bearing using J 38834.
- Dip the bearing in clean engine oil before installation.
- Install the bearing with the flat edge and the manufacturers markings facing the front of the engine.
2. Balance shaft into the block using J 36996 and J 8092.
- Dip the front balance shaft bearing into clean engine oil before assembly.
3. Balance shaft bearing retainer and bolts.
Tighten
Bolts to 14 Nm (120 in. lbs.).
4. Balance shaft driven gear and bolt.
Tighten
Bolt to 20 Nm (15 ft. lbs.) plus an additional 35 degrees.
5. Lifter retainer.
- Rotate the balance shaft by hand to make sure there is clearance between the balance shaft and the lifter retainer. Replace the lifter retainer if necessary.
6. Turn the camshaft so, with the balance shaft drive gear temporarily installed, its timing mark is straight up.
7. With the balance shaft drive gear removed, turn the balance shaft so the timing mark on the driven gear points straight down.
8. Balance shaft drive gear onto the camshaft.
Important
- Be sure that the timing marks on the balance shaft drive gear and the driven gear line up dot to dot.
9. Balance shaft drive gear retaining stud.
Tighten
Stud to 16 Nm (12 ft. lbs.).
10. Intake manifold, as outlined in this section.
11. Camshaft sprocket and timing chain.
Important: Line up the timing marks on the camshaft sprocket and crankshaft sprocket dot to dot (figure 41). When these marks are lined up dot to dot, the number four cylinder is at top dead center of its compression stroke. The distributor rotor will need to be positioned facing the number four terminal on the distributor cap when installed.
12. Camshaft sprocket bolts and nut.
Tighten
- Bolts and nut to 28 Nm (21 ft. lbs.).
13. Distributor.
14. Distributor wiring.
15. Front cover and front cover bolts.
- Use care when engaging the front of the oil pan seal with the bottom of the front cover. Lubricate the front of the oil pan seal with engine oil to aid assembly.
16. Crankshaft front oil seal to the front cover. Use J 35468.
17. Oil pan bolts, nuts, and reinforcements.
18. Flywheel inspection cover.
19. Torsional damper. Use J 23523-E.
20. Coolant pump.
21. Pencil brace to coolant pump.
22. Multiple ribbed belt.
23. Fan assembly.
24. A/C condenser.
25. Radiator.
26. Lower radiator hose.
27. Heater hose and overflow hose to radiator.
28. Upper radiator hose.
29. Transmission cooler lines to the radiator.
30. Oil cooler lines to the radiator.
31. Upper radiator shroud.
32. Air cleaner and air intake duct.
33. Negative battery cable.
- Fill crankcase with proper quantity and grade of engine oil.
- Fill cooling system with proper quantity and grade of coolant.
- Charge NC system.