Procedures

WM 1001IN Information on magnesium components and aluminium screws

Tools





Technical values





Information on working with aluminium screws

Information on aluminium screws

Aluminium screws and steel screws have different properties!

- Most aluminium screws are identified on Porsche V-engines by an internal Torx screw with internal pin ( => Aluminium screw on V-engines ). Aluminium screws can be identified differently on transmissions, on the chassis and on engines from other manufacturers. The design-related distinguishing features can be omitted if necessary.

- One differentiating feature is that aluminium screws are lighter than steel screws of the same size (e.g. screws used in bar ignition modules).

- Aluminium screws are different from steel screws in that they are not magnetic. If in doubt, check the screws using a magnet.

- The aluminium screws used at present have the additional marking RIBE (manufacturer) and AL9 (strength) on the screw head. => Aluminium screw on V-engines

- Screws with an internal pin can be loosened and tightened using commercially available bit inserts with a hole (safety bits).





Aluminium screw on V-engines

- Aluminium screws must be used only once. Replace the screws whenever they have been loosened.

- Aluminium screws must always be tightened in two steps (torque and torque angle) or require a special yield-point wrench Electronic torque wrench 9768. The specified tightening torques and torque angles must always be observed. The extent to which a screw is tightened can be limited using a yield-point wrench.

- There is no need to tighten by clicking once as this may cause irreparable damage to the screw.

- Sealants that can come into contact with aluminium screws in threaded bores must be approved for use with aluminium screws by Porsche => if this is not observed, there will be increased friction in the screw thread and the aluminium screw will break.

- Aluminium screws must not be fitted using tightening parameters for steel screws => the aluminium screw will break.

- Screw threads must be perfectly clean. Sealant residue or chips increase the friction coefficient => the aluminium screw will break. Blow out thread holes.

Aluminium screws




Information on working with magnesium components

The following components are made of magnesium:





Magnesium components (status 04/2010)





WARNING

Magnesium chips

- Danger of fire

-> Do not collect magnesium grinding dust, magnesium chips or abraded material in open containers. Use containers that can be sealed tightly.
-> A small amount of chips produced when re-cutting threads, for example, is not important.
-> If larger amounts of magnesium chips and dust are produced, these must not be stored dry.
-> The dust and chips must be removed by suction during extensive grinding work.
-> Avoid making sparks when working with magnesium.
-> Extinguish magnesium fires using fire extinguishers for metal fires rather than water.

Information

- Magnesium is corrosive in the event of contact with steel, copper or aluminium with a high copper content.

- Damaged magnesium threads must be repaired using aluminium threaded bushes without copper content that have been approved by Porsche.

- Magnesium components must only come into contact with screws (aluminium screws, coated screws), lubricants and sealing compounds that have been approved by Porsche (risk of corrosion).

- Heat-resistant copper paste cannot be used (risk of corrosion).

- Magnesium components must not come into contact with steel parts (panels, clamps, etc.) (risk of corrosion). => Possible corrosion on valve cover if steel plate clips are used inadvertently





Possible corrosion on valve cover if steel plate clips are used inadvertently

- Only use type-specific accessories and spare parts approved by Porsche. Do not use previously used parts or parts from the "tool kit".

- Always keep threaded joints and contact surfaces of magnesium components dry. Blow-dry threaded bores immediately if threaded joints are opened.