Harmonic Balancer - Crankshaft Pulley: Service and Repair
Removing and installing crankshaft belt pulleyTools
Preliminary work for removing crankshaft pulley
1. Loosen lock carrier.
2. Loosen drive belt and remove from the pulley.
Removing crankshaft belt pulley
1. Position arm bracket 96790 in the pulley and turn it until it locks.
ATTENTION Material damage!
^ If the tool slips or if the tool is faulty, the wings or the cooling fan can be damaged as a result of excessive forces!
^ Only use an appropriately strong tool (e.g. 3/4 inch)
^ Ensuring that the tool is seated correctly
^ Never use the special wrench socket wrench insert 9714, for loosening or tightening
^ Working with a second worker
2. Position a large torque wrench and loosen the central screw. Do not use the screw again.
3. Remove the central screw and pull the pulley down and forward.
Installing crankshaft belt pulley
Note:
^ A key is inserted into the crankshaft. When fitting the pulley, ensure that the key lies in the groove in the pulley.
^ The key must not fall into the engine.
^ The pulley and crankshaft stub must be cleaned.
1. Position the pulley on the crankshaft stub. Then press the pulley slightly in the direction of the engine, while at the same time twisting it until it slips definitively in the direction of the timing-case cover. When doing so, pay attention to the key.
2. Mount the new central screw hand tight into the crankshaft.
ATTENTION Material damage!
^ If the tool slips or if the tool is faulty, the wings or the cooling fan can be damaged as a result of excessive forces!
^ Only use an appropriately strong tool (e.g. 3/4 inch)
^ Ensuring that the tool is seated correctly
^ Never use the special wrench socket wrench insert 9714, for loosening or tightening
^ Working with a second worker
3. Position arm bracket 96790 in the pulley and turn it until it locks. Have a second worker operate the arm bracket.
ATTENTION Material damage!
^ If the tool slips or if the tool is faulty, the wings or the cooling fan can be damaged as a result of excessive forces!
^ Only use an appropriately strong tool (e.g. 3/4 inch)
^ Ensuring that the tool is seated correctly
^ Never use the special wrench socket wrench insert 9714, for loosening or tightening
^ Working with a second worker
4. Tighten central screw. Initial tightening: 20 (15 ft-lb.) Nm, then Initial tightening: 50 (37 ft-lb.) Nm, then Initial tightening: 250 (185 ft-lb.) Nm
5. Push on torque angle disc Mechanical angle disc for torque angle threaded joint NR.88-1. Attach a magnetic foot to a metal part and set the scale by turning the pointer to 0. As an alternative to the torque angle disc, marks can be made on the vibration balancer (crankshaft pulley) and the central screw using a waterproof pen. A continuous line between the central screw and vibration balancer represents the starting point, another line only on the vibration balancer at an angular distance of 90° shows the torque angle target.
ATTENTION Material damage!
^ If the tool slips or if the tool is faulty, the wings or the cooling fan can be damaged as a result of excessive forces!
^ Only use an appropriately strong tool (e.g. 3/4 inch)
^ Ensuring that the tool is seated correctly
^ Never use the special wrench socket wrench insert 9714, for loosening or tightening
^ Working with a second worker
6. Tighten central screw to torque angle. Torque angle - final tightening: 90°
Subsequent work
Touching up installing the crankshaft pulley
1. Mount drive belt.
2. Fasten lock mount.