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

Timing Belt Front Cover

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REMOVAL & INSTALLATION M20 Engine



The M20 engine is equipped with a timing belt, as opposed to a timing chain as is usual bmw style. The distributor guard plate is actually the upper timing belt cover.

  1. Disconnect the negative battery cable. Remove the distributor cap and rotor. Remove the inner distributor cover and seal.
  2.  
  3. Remove the 2 distributor guard plate attaching bolts and one nut. Remove the rubber guard and take out the guard plate (upper timing belt cover).
  4.  
  5. Rotate the crankshaft to set No. 1 piston at tdc of its compression stroke.
  6.  

At tdc of No. 1 piston compression stroke, the camshaft sprocket arrow should align directly with the mark on the cylinder head.

  1. Remove the radiator.
  2.  
  3. Remove the lower splash guard and take off the alternator, power steering and air conditioning belts.
  4.  
  5. Remove the crankshaft pulley and vibration damper.
  6.  
  7. If equipped with a 2 piece hub, hold the crankshaft hub from rotating with the proper tool. Remove the crankshaft hub bolt.
  8.  
  9. Install the hub bolt into the crankshaft about 3 turns and use the proper gear puller, to remove the crankshaft hub.
  10.  
  11. Remove the bolt from the engine end of the alternator bracket. Loosen the alternator adjusting bolt and swing the bracket out of the way.
  12.  
  13. Lift out the tdc transmitter and set it aside.
  14.  
  15. Remove the remaining bolt and