Genuine Mercedes-Benz 300TD Crankshaft Seal

Mercedes-Benz 300TD Crankshaft Seal Parts and Q&A

• Rear Main Seal
  017-997-74-47
  Q: How to remove and replace the crankshaft seal on a balancer on Mercedes-Benz 300TD?

  A:

  Remove the radiator and cooling fan, then take off the drivebelts. Mark the relationship of the crankshaft pulley to the damper, and remove the six Allen head screws to take off the pulley. Lock the front balancer to prevent it from turning and remove the bolt, using a bar if necessary. Use a hammer and punch to mark the relationship of the balancer and crankshaft for reinstallation. Draw the balancer off the crankshaft with a suitable puller tool, utilizing the crankshaft bolt and locking the balancer with a punch. Pry the old crankshaft seal out of the bore with a screwdriver, using a brass rod as a fulcrum. Inspect the sealing ring on the crankshaft and replace it with a new one if it is worn or damaged. Check the front and back contact surfaces for corrosion, damage, and burrs; replace a badly damaged balancer, but minor imperfections can be smoothed with fine sandpaper. Lubricate the inner circumference of the new crankshaft seal, and if there are signs of oil leakage at the seal bore, coat the outer circumference of the new seal with sealant. Position the seal and draw it fully into the bore with the pulley bolt using a suitable socket or piece of pipe and washers. Align the punch marks made during removal, place the balancer on the crankshaft, and draw it on using the pulley bolt and washers, ensuring the alignment dowels fit into the crankshaft cutouts. Place the pulley on the balancer, align the marks, and install the retaining bolts, tightening them securely before reinstalling the drivebelts, fan, and radiator.