A balance shaft is used to compensate for the rocking motion inherent in a 90-degree V-6 engine. It rotates at engine speed in the opposite direction. Mounted above the crankshaft in the cylinder block, it is driven by the timing chain.
Removal & Installation
- Before servicing the vehicle, refer to the Precautions Section.
- Disconnect battery negative cable from battery and properly isolate to prevent accidental reconnection.
- Remove the timing chain cover.
- Rotate the crankshaft and align the basic valve timing to 40 degrees ATDC.
- Remove the starter.
- Using Special Tool 9102 or a suitable flywheel locking tool, lock the flywheel.
Remove or disconnect the following:
- Hold the balance shaft rear counter weight with a drift and remove the rear retaining bolt.
- Remove the balance shaft rear counter weight from the balance shaft.
- Remove the balance shaft locking plate bolt (6) and locking plate at the front of the engine block.
Remove the balance shaft (5) from the front of the engine.
- Position the balance shaft (5) into the engine balance shaft bore from the front.
- Install the balance shaft rear counter weight onto the balance shaft and tighten the rear bolt to 15 ft. lbs. (20 Nm). Further rotate the bolt an additional 90°
- Install the balance shaft locking plate and tighten the bolt to 15 ft. lbs. (20 Nm).
- Install the crankshaft rear oil seal.
- Install the timing chain and cover.
- Remove Special Tool 9102 (flywheel locking tool) and install the starter.
- Start the engine and check for leaks.