Skylark L4-144 2.4L DOHC VIN T SFI (1997)
Balance Shaft: Service and Repair
Balance Shaft Replacement
Balance Shaft Assembly Replacement
TOOL REQUIRED:
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J 41088 Balance Shaft, Holding Plate
REMOVAL
1. Disconnect the negative battery cable.
2. Remove the engine oil pan.
3. Remove the balance shaft chain cover nut and bolt.
4. Remove the balance shaft chain cover.
5. Loosen but do remove the balance shaft chain tensioner.
6. Remove the oil pump cover.
7. Remove the oil pump assembly.
8. Rotate the engine crankshaft until the number one piston is at TDC.
9. Use balance shaft, holding plate to prevent the balance shafts from turning while loosening the bolt.
NOTE: The balance shaft driven sprocket bolt is left-hand threaded and must be loosened by rotating it in a clockwise direction.
10. Remove the balance shaft driven sprocket bolt.
NOTE: Mark the surface of the driven sprocket if it is going to be reused. This will insure that the chain continues to ride on the same tooth surface. If a
new driven sprocket will be installed, either surface can be placed against the shaft.
11. Remove the driven sprocket from the shaft.
12. Remove the balance shaft assembly fasteners and remove the assembly to the bench.
13. Check the balance shaft end play prior to disassembling the balance shaft housing.
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Set up the indicator to read off the back of the shafts.
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Press against the one shaft and note the movement.
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Repeat the above step on the other shaft.
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Compare against specifications.
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If out of specs, check the thrust plate for wear. Replace if necessary. If the end play is out of specs and the thrust plate is not worn, replace the
balance shafts.
