Harmonic Balancer - Crankshaft Pulley: Service and Repair
WM 137619 Removing and installing pulley (vibration balancer)
Tools
Preliminary work
1. Remove radiator frame -> 192019 Removing and installing radiator fan housing (radiator frame) - section on "Removing" 192019 Removing and installing cooling fan housing (radiator frame).
2. Remove drive belt -> 137819 Removing and installing drive belt - section on "Removing" Service and Repair.
Removing pulley (vibration balancer)
1. Arm bracket 9679/1 is to be inserted into the vibration damper and turned until it locks. => Arm bracket in vibration damper
Arm bracket in vibration damper
NOTICE
Incorrect handling of tools
- Risk of damage to the body
-> Only use tools approved by Porsche.
-> Always ensure that the tool is seated correctly.
-> Protect the body and interior of the vehicle from damage with protective covers.
-> Cover delicate components with cardboard or sheetmetal panels.
Information
Protect the radiator fins using cardboard or a sheetmetal panel to prevent damage.
Cover wing and peripheral parts to protect them.
2. Fit large torque wrench => Large torque wrench on the central screw or T-piece -2- (large socket, width across flats 27) and loosen central screw for balancer. Do not use the screw again. Use a tubular handle -1- , if necessary. Loosening torque is very high.
Large torque wrench on the central screw
Use of tool for vibration damper
3. Remove central screw and pull vibration damper down and forwards. => Vibration damper
Vibration damper
Installing pulley (vibration balancer)
Information
The tightening specifications for the basic engine are stored centrally. -> 1001IN Tightening torques, tightening sequences, assembly overviews [1][2]Specifications. Tightening torques and assembly instructions for other assemblies (e.g. chassis, electrics, transmission or body) or for peripheral engine equipment can be found in the corresponding documents.
Information
- A feather key is inserted into the crankshaft. When fitting the vibration damper (crankshaft pulley), ensure that the feather key slots into the groove.
- The key must not fall into the engine.
- Vibration damper (crankshaft pulley) and crankshaft stub must be cleaned.
1. Position vibration damper (crankshaft pulley) onto the crankshaft stub. Press the vibration damper slightly in the direction of the engine, while at the same time twisting it until it slips in the direction of the timing-case cover. When doing so, pay attention to the feather key => Pulley on crankshaft stub.
Pulley on crankshaft stub
2. New central screw must be fitted hand-tight. => Central screw in crankshaft
Central screw in crankshaft
Information
Protect the radiator fins using cardboard or a sheetmetal panel to prevent damage.
Cover wing and peripheral parts to protect them.
3. Arm bracket 9679/1 is to be inserted into the vibration damper and turned until it locks => Arm bracket in the pulley. Have arm bracket operated by another worker.
Arm bracket in the pulley
4. Using a torque wrench and a suitable socket (width across flats 27), position at the central screw => Large torque wrench at central screw and only carry out the step-by-step torque tightening.
Large torque wrench at central screw
Pulleys
5. Following the tightening to torque, mark vibration damper and central screw for the torque-angle tightening using a water-resistant marker. To do this, make an initial mark on the vibration damper and the central screw at the same position -1 and 2-. Make a final mark in accordance with the specified torque angle only on the vibration damper -3-.
Markings on vibration damper and central screw (viewed from above)
Markings on vibration damper and central screw (different view)
NOTICE
Incorrect handling of tools
- Risk of damage to the body
-> Only use tools approved by Porsche.
-> Always ensure that the tool is seated correctly.
-> Protect the body and interior of the vehicle from damage with protective covers.
-> Cover delicate components with cardboard or sheetmetal panels.
Carry out the torque-angle tightening so that the mark on the screw is turned from the initial mark on the vibration damper step-by-step (repositioning the tools repeatedly) to the final mark on the vibration damper -arrow-. This is the way to carry out the torque angle tightening.
Use of tool for vibration damper
Subsequent work
1. Install drive belt -> 137819 Removing and installing drive belt - section on "Installing" Service and Repair.
2. Install radiator frame -> 192019 Removing and installing radiator fan housing (radiator frame) - section on "Installing" 192019 Removing and installing cooling fan housing (radiator frame).