20. Instruments: removal, dismantling and reassembly

  1. On all models the headlamp housing or handlebar fairing, the headlamp assembly or the fairing (as appropriate) must be either removed or partially dismantled to gain access to the instrument panel mountings. Refer to Section 15 for full details.
  2. With the panel mountings exposed, remove its single retaining screw and withdraw the connector plug cover, then unplug both connector blocks.
  3. Remove the tour mounting screws or bolts and withdraw the panel assembly. Note: Check the panel rubber mountings very carefully and renew them if there is the least sign of wear or damage. The instruments are sensitive and will be damaged if subjected to excessive vibration levels. If the panel mountings are altered tor any reason (such as fitting aftermarket fairings to standard models) great care must be taken to mount the panel correctly so that it is insulated from vibration.
  4. To dismantle the assembly, invert it on a completely clean work surface and remove the screws around the periphery (there are seven on early 100 models, none on all 75 models and 1986 on 100 models), Withdraw the bottom cover and examine the sealing ring; this must be renewed if it is damaged in the slightest way to prevent moisture trom entering,
  5. All instrument illuminating and warning lamp bulbs may be removed at this stage, if required. Being very careful not to damage any component, especially the connector pins, use a pair of pliers to extract the bulb holder; the bulb is of the capless type which is pulled easily out of the holder. Ensure that the wire filaments are correctly inserted on refitting. Note that certain bulbs have a cap fitted over their envelopes; these must be replaced on the new bulb.
  6. The printed circuit board is retained by two small black-finished screws, each immediately next to the instrument illuminating lamp bulb holder in the bottom left and right corners (looking at the unit as it is inverted on the bench), and by two larger plated screws at the bottom edge of the connector plug pins. Remove these screws and very carefully use a small screwdriver to prise the board up at all contact plug points, ie top left above the tachometer and bottom left, top right above the speedometer and at the bottom, just to the right of the connector plug pin. Do not use force; if the contact pins will not release easily take the assembly to an authorised BMW dealer to be dismantled by an expert. With the pins released, withdraw the board.
  7. Using a small screwdriver to release the locking catches, front pair first and then the rear pair, lift the clock (where fitted) out to the top. Disengage the locking catches and lift out the warning lamp bulb holder frame.
  8. The fuel gauge circuit board is secured in the panel top left corner (looking at the unit as it is inverted on the bench) by two small screws (with either plated slotted heads or black-finished cross-heads). Remove the screws and carefully prise the circuit board off its connector pins.
  9. Remove its two large, plated cross-head retaining screws and withdraw the tachometer assembly. Carefully lever off the needle, remove the retaining screws and withdraw the dial then turn the unit round, remove the two retaining screws and withdraw the gear indicator circuit board to one side, noting the spacer.
  10. 10 The speedometer circuit board is secured by two small screws (with either plated slotted heads or black-finished cross-heads) below the speedometer assembly. Remove the screws and carefully prise the circuit board off its connector pins.
  11. Pull out as far as possible the speedometer trip reset button and remove the two retaining screws to release the unit.
  12. On reassembly, all components must be scrupulously clean and dry. Do not overtighten any mounting screws or use force to fit components, but ensure that all are correctly fastened and that all connector pins are fully seated. To rebuild the assembly, follow exactly the reverse of the removal procedure.

20.3 Instrument panel is very delicate -> handle carefully

20.4 Remove screws to release bottom cover - note sealing ring

20.5 Removal of panel bottom cover gives access to panel bulb holders