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Harmonic Balancer - Crankshaft Pulley: Service and Repair




REMOVAL AND INSTALLATION













Required Special Tools:

- MB990767: Front Hub and Flange Yoke Holder

- MD998719: Pin

- MB992275: Drive Belt Installer

- MB992276: Drive Belt Remover

REMOVAL SERVICE POINTS

[[A]] GENERATOR DRIVE BELT REMOVAL





1.
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.

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]] POWER STEERING OIL PUMP DRIVE BELT REMOVAL





1.
CAUTION:

- To reuse the power steering oil pump drive belt, draw an arrow indicating the rotating direction on the back of the power steering oil pump drive belt using chalk to install the same direction.

- Hang the special tool MB992276 on the vehicle components (including front side members) using a cord and paper clip to prevent from falling.

Set the special tool MB992276 as shown and hold it by a finger.





2.
CAUTION:
Be careful that the finger holding the special tool MB992276 is not pinched.

Slightly turn the crankshaft pulley clockwise until the special tool MB992276 is pinched and held between the oil pump assembly pulley and the power steering oil pump drive belt as shown.
3. If the special tool MB992276 is held, move the finger off.
4.
CAUTION:
If the power steering oil pump drive belt is detached, be careful that the special tool MB992276 is also detached and fallen.

Slowly turn the crankshaft pulley clockwise until the power steering oil pump drive belt goes aground on the special tool MB992276 and is detached.
5. Remove the special tool MB992276.

[[C]] 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 pulley center 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 POINTS

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





1.
CAUTION:
Before installing the crankshaft pulley center 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.

Clean the bolt hole in crankshaft pulley center 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 pulley center bolt and the outer surface of crankshaft pulley washer.





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





9. Make a paint mark on the crankshaft pulley center bolt.
10.
CAUTION:

- If the crankshaft pulley center bolt is turned less than 60 degrees, proper fastening performance may not be achieved. Be careful to tighten the crankshaft pulley center bolt exactly 60 degrees.

- If the crankshaft pulley center bolt is overtightened (exceeding 60 degrees), loosen the crankshaft pulley center bolt completely and then retighten it by repeating the tightening procedure from step 6.

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

]]B[[ POWER STEERING OIL PUMP DRIVE BELT INSTALLATION





1.
CAUTION:
Check that the belt is fitted in the notches of the notched pulley and the notches of crankshaft pulley securely.

Install the power steering oil pump drive belt in the crankshaft pulley.













2.
CAUTION:

- Hang the special tool MB992275 on the vehicle components (including front side members) using a cord and paper clip to prevent from falling.

- Be careful that the finger holding the special tool MB992275 is not pinched.

Set the special tool MB992275 and power steering oil pump drive belt in the oil pump assembly pulley and hold it by a finger as shown.
NOTE:

- Check that the top surface of power steering oil pump drive belt goes aground on the special tool MB992275, and the power steering oil pump drive belt is fitted in the notched under the oil pump assembly pulley securely as shown.

- Slightly turn the crankshaft pulley clockwise until the special tool MB992275 is pinched and held between the oil pump assembly pulley and the power steering oil pump drive belt as shown.

3. If the special tool MB992275 is held, move the finger off.
4.
CAUTION:
If the power steering oil pump drive belt is installed, be careful that the special tool MB992275 is detached and fallen.

Slowly turn the crankshaft pulley clockwise and install the power steering oil pump drive belt.
5. Turn the crankshaft pulley until the special tool MB992275 is detached from the oil pump assembly and fallen, and then remove the special tool MB992275.
6. Turn the crankshaft pulley clockwise on several times and check that the power steering oil pump drive belt is installed in the oil pump assembly pulley and the crankshaft pulley securely.
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