BMW 318/325/M3/525/535/M5 1989-1993 Repair Information

Crankshaft Hub/Damper

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REMOVAL & INSTALLATION M20 Engine



  1. Remove the fan and radiator. Remove the belts and water pump pulley. Remove the vibration damper bolts and remove the damper and pulley.
  2.  
  3. Remove the timing belt covers and belt.
  4.  
  5. Hold the hub with bmw tool 11 2 150 or equivalent. Remove the center bolt and the collar.
  6.  
  7. Replace the bolt in the threaded hole about 3 turns. Use a gear puller that has arms that will thread into the holes to remove the hub.
  8.  
  9. If the engine has a 2 piece hub, place the bolt back into the center hole about 3 turns and remove the sprocket using a similar puller as used to remove the first piece.
  10.  

To install:
  1. Install the hub and sprocket with the lettering facing outwards. Check the crankshaft key is in place.
  2.  
  3. Hold the hub with bmw tool 11 2 150 or equivalent. Torque the center bolt to 281-309 ft. lbs. (390-430 Nm).
  4.  
  5. Install the timing belt. Use a new timing belt. Install the belt covers.
  6.  
  7. Install the vibration damper and pulley, matching the alignment pin. Torque the bolts to 16.5-17.5 ft. lbs. (22-24 Nm).
  8.  
  9. Install the water pump pulley and tighten the bolts to 6-7 ft. lbs. (8-10 Nm). Install the belts and tighten. Install the fan and radiator. Fill the radiator with coolant mixture.
  10.  

M30 Engine

  1. Remove the fan and radiator. Remove the belts. Remove the vibration damper bolts and remove the damper and pulley.
  2.  
  3. Hold the hub with bmw tool 11 2 220 or equivalent, or lock the flywheel. Remove the center bolt and the collar.
  4.  
  5. Replace the bolt in the threaded hole about 3 turns. Use a gear puller that has arms that will thread into the holes to remove the hub.
  6.  

To install:
  1. Install the hub and check the crankshaft key is in place.
  2.  
  3. Hold the hub with bmw tool 11 2 220 or equivalent. Torque the center bolt to 311-325 ft. lbs. (430-450 Nm).
  4.  
  5. Install the vibration damper and pulley, matching the alignment pin. Torque the bolts to 16.5-17.5 ft. lbs. (22-24 Nm).
  6.  
  7. Install the belts and tighten. Install the fan and radiator. Fill the radiator with coolant mixture.
  8.  

M42 Engine

  1. Remove the fan and radiator. Remove the belts. Remove the vibration damper bolts and remove the damper and pulley.
  2.  
  3. Hold the hub or lock the flywheel. Remove the center bolt and the collar.
  4.  
  5. Replace the bolt in the threaded hole about 3 turns. Use a gear puller that has arms that will thread into the holes to remove the hub.
  6.  

To install:
  1. Install the hub and check the crankshaft key is in place. The collar part of the washer faces the hub.
  2.  
  3. Hold the hub or lock the flywheel. Torque the center bolt to 224 ft. lbs. (310 Nm).
  4.  
  5. Install the vibration damper and pulley, matching the alignment pin. Torque the bolts to 16.5-17.5 ft. lbs. (22-24 Nm).
  6.  
  7. Install the belts and tighten. Install the fan and radiator. Fill the radiator with coolant mixture.
  8.  

M50 Engine

  1. Remove the fan and radiator. Remove the belts. Remove the vibration damper bolts and remove the damper and pulley.
  2.  
  3. Hold the hub or lock the flywheel. Remove the center bolt and the collar.
  4.  
  5. Replace the bolt in the threaded hole about 3 turns. Use a gear puller that has arms that will thread into the holes to remove the hub.
  6.  

To install:
  1. Check the condition of the cover seal. Replace if necessary. Install the hub and check the crankshaft key is in place. The collar part of the washer faces the hub.
  2.  
  3. Hold the hub or lock the flywheel. Torque the center bolt to 296 ft. lbs. (410 Nm).
  4.  
  5. Install the vibration damper and pulley, matching the alignment pin. Torque the bolts to 16.5-17.5 ft. lbs. (22-24 Nm).
  6.  
  7. Install the belts and tighten. Install the fan and radiator. Fill the radiator with coolant mixture.
  8.  

S14 Engine

  1. Remove the fan and radiator. Remove the belts.
  2.  
  3. Hold the hub by locking the flywheel. Remove the center bolt.
  4.  
  5. Gently tap the pulley from the crankshaft. Do not use a gear puller or hit it with a hammer, otherwise the pulley can be distorted.
  6.  

To install:
  1. Check the condition of the cover seal. Replace if necessary. Install the pulley and check the crankshaft key is in place.
  2.  
  3. Hold the hub by locking the flywheel. Torque the center bolt to 311-325 ft. lbs. (430-450 Nm).
  4.  
  5. Install the belts and tighten. Install the fan and radiator. Fill the radiator with coolant mixture.
  6.  

S38 Engine

The damper and hub should be removed while the engine is still in the car. The hub is held with such a high torque on the nut that it would be impractical to hold the engine on a stand while trying to loosen of tighten the nut. The procedure calls for using a brace that bolts to the hub and wedges against the front subframe. This provides the counter torque necessary.

  1. Remove the fan and radiator. Remove the belts.
  2.  
  3. Turn the engine so the tdc mark on the tooth wheel faces straight down. Attach tool 11 2 240, or equivalent to the pulley with all 8 of the 8 X 20mm bolts. The mounting pattern is asymmetrical and the tool can only be mounted one way. The tool is designed so it bears against the right side of the subframe and provide the counteroffers to the removal torque of the vibration damper bolt.
  4.  
  5. Remove the nut. Remove the hub and damper. Remove the damper from the hub.
  6.  

To install:
  1. Check the condition of the cover seal. Replace if necessary. Install the hub and check the crankshaft key is in place.
  2.  
  3. With the tool 11 2 240 or equivalent in place, torque the nut to 43 ft. lbs. (60 Nm). Then turn the nut 60 degrees, then another 60 degrees and finish with a 30 degree turn.
  4.  
  5. Remove the tool and tighten the damper bolts to 17 ft. lbs. (23 Nm).
  6.  
  7. Replace the belts, fan and radiator. Fill the radiator with coolant mixture.
  8.  

 
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