Volvo Coupes/Sedans/Wagons 1970-1989 Repair Guide

Balance Shafts

Print

REMOVAL & INSTALLATION



B234 Engine

The use of the correct special tools or their equivalent is REQUIRED for this procedure.

LEFT SHAFT AND HOUSING
  1. Remove the timing and balance shaft belts as described under Timing Belt Removal and Installation.
  2.  
  3. Use a counterhold such as Volvo tool No. 5362 and remove the left side balance shaft pulley.
  4.  
  5. Remove the air mass meter and inlet hose.
  6.  
  7. Unfasten the bracket under the intake manifold and remove the bracket holding the alternator and power steering pump. These may be swung out of the way and tied with wire to the left shock tower.
  8.  
  9. Remove the bolts securing the balance shaft housing to the block. Using an extractor such as Volvo tool No. 5376 or similar, carefully separate the housing from the block. The housing must be removed evenly from both its front and rear mounts.
  10.  

To install:
  1. Clean the joint faces on the cylinder block. Place new O-rings in the grooves around the oil passages on the housing. The rings can be held in place with a light coating of grease.
  2.  
  3. Install the balance shaft housing. Make absolutely sure the housing is evenly mounted on the front and rear mountings. Tighten the bolts alternately in a diagonal pattern. Tighten each bolt 1 / 2 turn at a time; tighten them to 15 ft. lbs. (20 Nm). When all the bolts are at 15 ft. lbs. (20 Nm), loosen them individually and tighten each one to 7.5 ft. lbs. (10 Nm) PLUS 90° of rotation.
  4.  


WARNING
Make certain that the shaft does not seize within the housing during installation.

  1. If the halves of the housing were split apart during the repair, tighten the joint bolts to 6 ft. lbs. (8 Nm).
  2.  
  3. Install the drive pulley. Use a counterholding tool. Note that the pulley has a slot which will align with the guide on the shaft. The shallow side of the pulley faces inward (toward the engine). Tighten the center bolt for the pulley to 37 ft. lbs. (50 Nm).
  4.  
  5. Install the bracket for the alternator and power steering pump. Double check their connections and hoses. Attach the support under the intake manifold and don't forget the wire clamp on the bottom bolt.
  6.  
  7. Install the air mass meter and its intake hose.
  8.  
  9. Install the balance shaft belt and camshaft belt following the procedures outlined under Timing Belt Removal and Installation.
  10.  

RIGHT SHAFT AND HOUSING
  1. Remove the timing and balance shaft belts as described under Timing Belt Removal and Installation.
  2.  
  3. Use a counterhold such as Volvo tool No. 5362 and remove the left side balance shaft pulley.
  4.  
  5. Remove the balance shaft belt tensioner and remove the bolt running through the backing plate to the balance shaft housing.
  6.  
  7. Remove the air mass meter and its air inlet hose.
  8.  
  9. Remove the air preheat hose from the bottom heat shield at the exhaust manifold. Remove the nuts holding the right engine mount to the crossmember.
  10.  
  11. Connect a hoist or engine lift apparatus to the top of the engine. Lift the engine at the right side, being careful to maintain clearance between the brake master cylinder and the intake manifold.
  12.  
  13. Remove the complete motor mount from the block, including the pad and lower mounting plate.
  14.  
  15. Remove the bolts securing the balance shaft housing to the block. Using an extractor such as Volvo tool No. 5376 or similar, carefully separate the housing from the block. The housing must be removed evenly from both its front and rear mounts.
  16.  

To install:
  1. Clean the joint faces on the cylinder block. Place new O-rings in the grooves around the oil passages on the housing. The rings can be held in place with a light coating of grease.
  2.  
  3. Install the balance shaft housing. Make absolutely sure the housing is evenly mounted on the front and rear mountings. Tighten the bolts alternately in a diagonal pattern. Tighten each bolt 1 / 2 turn at a time; tighten them to 15 ft. lbs. (20 Nm). When all the bolts are at 15 ft. lbs. (20 Nm), loosen them individually and tighten each one to 7.5 ft. lbs. (10 Nm) PLUS 90° of rotation.
  4.  


WARNING
Make certain that the shaft does not seize within the housing during installation.

  1. If the halves of the housing were split apart during the repair, tighten the joint bolts to 6 ft. lbs. (8 Nm).
  2.  
  3. Install the drive pulley. Use a counterholding tool. Note that the pulley has a slot which will align with the guide on the shaft. The shallow side of the pulley faces inward (toward the engine). Tighten the center bolt for the pulley to 37 ft. lbs. (50 Nm).
  4.  
  5. Install the engine mount onto the block.
  6.  
  7. Using the studs on the crossmember as a guide, lower the engine into place on the front crossmember. When the engine is correctly seated, the lifting apparatus may be removed.
  8.  
  9. Install the air mass meter and its air intake hose.
  10.  
  11. Install the motor mount bolts and the air preheat tube at the lower part of the exhaust manifold.
  12.  
  13. Install the bolt through the backing plate and into the balance shaft housing. Install the belt tensioner, tightening the bolt so that the pulley is movable when the belt is in position.
  14.  
  15. Install the balance shaft and camshaft belts as described in Timing Belt Removal and Installation.
  16.  

 
label.common.footer.alt.autozoneLogo