Brett_jjj
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The workshop manuals says that if the front balance shaft bearing shows to be out of spec, then the front bearing and balance shaft must both be renewed as an assembly. The front balance shaft bearing controls the end float of the balance shaft, and if the bearing/shaft is out of spec and not replaced, it will make the engine rattle its head off and just run noisily.
If you find that the balance shaft bearings are stuffed, and are making the engine run heaps noisy, you can just remove the balance shaft drive sprocket so the shaft doesnt run any more.I know a couple of guys who have done this with no problems, and they dont get any excessive vibrations etc from the engine.
If the rear balance shaft bearing is replaced at all, the new bearing must be located in the correct position. which is from around 0.99 to 1.49 mm inwards from the rear of the engine block.
EDIT- its 0.99 to 1.49 mm for ecotec, and 22.18 to 22.68 mm for buick.
If you find that the balance shaft bearings are stuffed, and are making the engine run heaps noisy, you can just remove the balance shaft drive sprocket so the shaft doesnt run any more.I know a couple of guys who have done this with no problems, and they dont get any excessive vibrations etc from the engine.
If the rear balance shaft bearing is replaced at all, the new bearing must be located in the correct position. which is from around 0.99 to 1.49 mm inwards from the rear of the engine block.
EDIT- its 0.99 to 1.49 mm for ecotec, and 22.18 to 22.68 mm for buick.
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