Subaru Coupes/Sedans/Wagons 1985-1996 Repair Guide

Balance Shaft

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A balance shaft is fitted to the 1.2L engine only. The balance shaft, spinning in the opposite direction of engine rotation, counters engine vibration and provides a smoother running engine. To service the balance shaft, the engine must be completely disassembled. Refer to the Crankshaft and Main Bearings portion of this section for removal and installation procedures.

REMOVAL & INSTALLATION



1.2L Engine

See Figures 1 and 2

Click image to see an enlarged view

Fig. Fig. 1: Crankshaft and balance shaft assembly-1.2L engine



Click image to see an enlarged view

Fig. Fig. 2: Aligning the idler chain

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the engine from the vehicle. Refer to the procedure in this section.
  4.  
  5. Remove the cylinder head from the engine using the steps outlined in the cylinder head removal procedure in this section.
  6.  
  7. Remove the oil filter and discard.
  8.  
  9. Tag and disconnect the alternator wires and remove the alternator and retainer bracket.
  10.  
  11. Remove the engine mount and engine mount stay.
  12.  
  13. Remove the dipstick, tube and seal.
  14.  
  15. Remove the flywheel housing cover.
  16.  
  17. Remove the oil pan assembly.
  18.  
  19. Remove the water pump cover and impeller.
  20.  
  21. Remove the water pipe.
  22.  
  23. Remove the crankcase cover.
  24.  
  25. Remove the connecting rod caps followed by the connecting rod and piston assemblies.
  26.  
  27. Remove the crankshaft main caps, crankshaft and oil seal.
  28.  
  29. Remove the chain and chain guide.
  30.  
  31. Remove the oil pump sprocket.
  32.  
  33. Remove the balance shaft.
  34.  

To install:
  1. Install the balance shaft.
  2.  
  3. Rotate the balance shaft so the timing mark is pointing toward the base of the engine block.
  4.  
  5. Install the oil pump sprocket so the notch is straight up and down.
  6.  
  7. Install the timing chain with the single gold link over the timing mark on the balance shaft sprocket.
  8.  
  9. Install the crankshaft with the timing mark on the sprocket facing straight up the engine block.
  10.  
  11. Install the crankshaft main bearing caps. Tighten the bolts in order to 29-33 ft. lbs. (38-43 Nm).
  12.  
  13. Tighten the chain guide bolts to 4-5 ft. lbs. (5-6 Nm).
  14.  
  15. Install the piston and connecting rod assemblies following the recommended procedures in this section.
  16.  
  17. Install the rear main oil seal.
  18.  
  19. Install the crankcase cover using a new gasket. Install the suction manifold bracket, then secure the cover and bracket in place with the retainer bolts tightened to 7-8 ft. lbs. (9-10 Nm).
  20.  
  21. Install the water pump impeller into the crankcase cover and connect it to the balance shaft. Tighten the retainer bolts to 7-8 ft. lbs. (9-10 Nm).
  22.  
  23. Install the water pump cover. Tighten the cover bolts to 7-8 ft. lbs. (9-10 Nm).
  24.  
  25. Install the oil pan using a new gasket. Refer to the procedure in this section for installation steps.
  26.  
  27. Install the flywheel housing cover.
  28.  
  29. Install the dipstick, dipstick tube and seal.
  30.  
  31. Install the flywheel. Tighten the bolts to 65-71 ft. lbs. (84-92 Nm).
  32.  
  33. Install a new oil filter.
  34.  
  35. Install the engine mount and engine mount stay.
  36.  
  37. Install the alternator bracket and alternator. Connect the alternator electrical harness.
  38.  
  39. Install the cylinder head following the recommended procedure in this section.
  40.  
  41. Connect the negative battery cable.
  42.  
  43. Start the engine and check for leaks.
  44.  

 
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