Installing Crankshaft Sealing Ring - Flywheel Side

→ Use prescribed tool.

Tools: 

New insert assembly aid 9699/3  for special tool insertion tool 9699  .

Fig 1: Identifying Insertion Tool 9699/3

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Component overview of insertion tool 

Fig 2: Overview Of Insertion Tool

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1. Hexagon-head bolt for fitting the sealing ring
2. Assembly sleeve (body of insertion tool 9699)
3. Guide pin for guiding the insert into the sleeve
4. Fastening screws used to secure the insertion tool to the crankshaft flange
5. Insert 9699/3 for installing the PTFE sealing ring with supporting sleeve

1. Fit the assembly aid 9699/3  into the insertion tool 9699  .
   1. 1.1. To do this, unscrew the hexagon-head bolt and replace the inserts.
2. Small burred spots or damaged areas on the tools can be filed down with a nail file, then removed with an oilstone or fine abrasive or polishing cloth.
   1. 2.1. Remove residual dirt on the tools using solvent naphtha or acetone.
3. Adjust the insertion tool for fitting the supporting sleeve for the sealing ring. Only unscrew the hexagon-head bolt until the groove on the assembly aid 9699/3  is flush with the contact surface of the sleeve -arrow-  .
   Fig 3: Locating Sealing Ring Groove

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   CAUTION: Damage to the sealing lip.

   • Leaks

   → The crankshaft flange and tools must be perfectly clean and free of grease.

   → The sealing ring must be fitted dry, i.e. no oil, grease or other lubricants can be used.

   → The crankcase bore must not be oiled.

   → The sealing ring can only be positioned on the assembly tool using the supporting sleeve.

   → The new crankshaft sealing ring (PTFE) is supplied on a supporting sleeve as a spare part.

   → Do not remove the sealing ring from the supporting sleeve.

4. Pre-fit new crankshaft sealing ring for installation on the tool.
   1. 4.1. Slide on the crankshaft sealing ring -1-  using the supporting sleeve -2-  until it is fitted securely on the assembly aid 9699/3  . Apply pressure on the supporting sleeve only while doing this.
   2. 4.2. The collar of the sleeve must be facing away from the tool -inset-  .
   3. 4.3. Only fit the crankshaft sealing ring dry.
      Fig 4: Sliding PTFE Sealing Ring And Supporting Sleeve

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5. Fitting tool 9699  must now be fitted on the crankshaft flange.
   1. 5.1. Fit and tighten the tool on the crankshaft flange using the two internal M8 cheese head bolts (hexagon socket, a/f 8) -arrows-  . The crankshaft flange's dowel pin must fit into the bore of the tool.
      1. Change-over ratchet with socket-wrench insert for hexagon socket (a/f 8)
         Fig 5: Securing Insertion Tool On Crankshaft Flange

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      Information 

      • Insertion tool 9699 must be left in place for two to three minutes after fitting the sealing ring so that the sealing lip can settle into position on the crankshaft flange. 
6. Turn the hexagon-head bolt (a/f 19) clockwise as far as it will go in order to position the crankshaft sealing ring correctly on the crankshaft flange.
   1. 6.1. Leave the tool in place for approx. two minutes.

      Change-over ratchet with socket-wrench insert (a/f 19)

      Fig 6: Pulling In Sealing Ring

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7. Remove tool.
   1. 7.1. Turn hexagon-head bolt anti-clockwise until the guide screws are still just visible.
   2. 7.2. Unscrew the two M8 cheese head bolts and remove the tool.
8. Check that the sealing ring is seated correctly and is straight.
   1. 8.1. To check this, take measurements at four different places, offset by 90°, from the crankshaft flange surface to the sealing ring (level surface).

      → Measured value: 7 mm+/-0.3 mm 

9. Leave supporting sleeve on the tool following installation in order to protect the edges of the tool.
   1. 9.1. Using a small screwdriver, carefully lever off the sleeve at the ventilation bore -arrow-  and remove it.
      Fig 7: Locating Support Ring On Insertion Tool

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