Balance Shaft Chain Replacement: Installation

IMPORTANT:  If balance shafts are not correctly timed to crankshaft the engine may vibrate or make excessive noise.

1. Orient timing marks on balance shafts.
   1. 1.1 Intake side balance shaft timing mark should be pointing up.
      Fig 1: Aligning Intake Balance Shaft Timing Mark

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   2. 1.2 Exhaust side balance shaft timing mark should be pointing down.
      Fig 2: Aligning Exhaust Balance Shaft Timing Mark

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2. With balance shafts oriented, install balance shaft crankcase sprocket onto crankshaft.
3. Place number one piston at top dead center (TDC).
   NOTE: The crankshaft keyway slot will be pointing up (12 o'clock position) when set at TDC.
4. Install balance shaft chain with colored links lined up with marks on balance shaft sprockets with mark on crankshaft sprocket.

   IMPORTANT:  There is one (1) copper link and two (2) chrome links on balance shaft chain.

   1. 4.1 Orient chain so that copper link (1) aligns with mark on intake side balance shaft sprocket.
   2. 4.2 Install chain in a clockwise direction, place chrome link (2) to align with mark on crankshaft sprocket.
   3. 4.3 Align last chrome link (3) with timing mark on exhaust side balance shaft sprocket.
      Fig 3: Installing Balance Shaft Chain

      Courtesy of GENERAL MOTORS CORP.
5. Install upper chain guide and bolt.

   Torque: 

   Balance Shaft Chain Guide (Upper) 

   Bolts: 10 N.m (89 in-lbs) 

   Fig 4: Installing Upper Chain Guide And Bolt

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6. Install small chain guide and bolt.

   Torque: 

   Balance Shaft Chain Guide (Fixed) 

   Bolts: 10 N.m (89 in-lbs) 

   Fig 5: Installing Small Chain Guide And Bolt

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7. Install adjustable chain guide and bolts.

   Torque: 

   Balance Shaft Chain Guide (Adjustable) Bolt: 10 N.m (89 in-lbs) 

   Fig 6: Installing Adjustable Chain Guide And Bolts

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8. Rotate plunger on chain tensioner 90°. Compress plunger and lock in place by inserting a thin wire (or paper clip) into the hole on side of plunger body.
9. Install balance shaft drive chain tensioner and bolts.

   Torque: 

   Balance Shaft Chain Tensioner Bolts: 10 N.m (89 in-lbs) 

10. Remove thin wire (or paper clip) from chain tensioner to release plunger.
    Fig 7: Installing Balance Shaft Drive Chain Tensioner And Bolts

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11. Install timing chain. Refer to TIMING CHAIN REPLACEMENT .
    Fig 8: Installing Timing Chain

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12. Install front cover. Refer to FRONT COVER AND OIL PUMP ASSEMBLY REPLACEMENT .
    Fig 9: Installing Front Cover

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13. Install camshaft cover.
14. Connect negative battery cable.

Torque: 

Battery Terminal Bolt: 17 N.m (13 ft-lbs) 

Fig 10: Installing Camshaft Cover

Courtesy of GENERAL MOTORS CORP.