Harmonic Balancer - Crankshaft Pulley: Service and Repair

CRANKSHAFT PULLEY

REMOVAL AND INSTALLATION

Pre-removal and Post-installation Operation:

Removal Steps 1-6:

Required Special Tools:
^ MB990767: End Yoke Holder
^ MD998719: Pin

REMOVAL SERVICE POINTS

[[A]] GENERATOR DRIVE BELT REMOVAL

CAUTION: When the generator drive belt is reused, draw an arrow indicating the rotating direction on the back of the belt using chalk to install the same direction.





1. Turn the drive belt auto-tensioner to counterclockwise, and insert the L-shaped hexagon wrench to the auto-tensioner hole in order to fix the auto-tensioner.
2. Remove the generator drive belt.

[[B]] CRANKSHAFT PULLEY CENTER BOLT/CRANKSHAFT PULLEY WASHER/CRANKSHAFT PULLEY REMOVAL

CAUTION: Use only the specified special tools, or a damaged pulley damper could result.





Use special tools MB990767 and MD998719 to remove the crankshaft pulley from the crankshaft.





CAUTION: Provide one punch mark on the head of the crankshaft bolt each time the bolt is removed.

Replace the bolt that already has three punch marks. (The evidence of having been tightened three times)

INSTALLATION SERVICE POINT

]]A[[ CRANKSHAFT PULLEY/CRANKSHAFT PULLEY WASHER/CRANKSHAFT PULLEY CENTER BOLT INSTALLATION

CAUTION: Before installing the crankshaft bolt, check the number of punch marks on its head. (The bolt is reusable if it is two or less.) If the bolt has three punch marks, replace it.





1. Clean the bolt hole in crankshaft bolt and crankshaft pulley's seating surface.
2. Degrease the cleaned seating surface of the front flange and crankshaft pulley.
3. Install the front flange and crankshaft pulley.
4. Apply oil to the threads of crankshaft bolt and the outer surface of washer.





5. Use special tools MB990767 and MD998719 to install the crankshaft pulley.
6. Tighten the crankshaft bolt to 200 Nm (148 ft-lb).
7. Loosen the crankshaft bolt fully.
8. Tighten the crankshaft bolt to 110 Nm (81 ft-lb).





9. Make a paint mark on the crankshaft bolt.

CAUTION:
^ If the nut is turned less than 60°, proper fastening performance may not be achieved. Be careful to tighten the nut exactly 60°.
^ If the nut is overtightened (exceeding 60°), loosen the nut completely and then retighten it by repeating the tightening procedure from step 6.

10. Make a paint mark on the bolt end at a position 60° from the paint mark made on the washer in the direction of tightening the crankshaft bolt.
11. Turn the crankshaft bolt another 60° and make sure that the paint marks on the washer and crankshaft bolt are aligned.