REPLACING TDC POSITION SENSOR
Important: Stop engine and turn off ignition
prior to performing any work on a transistor
ignition system. DANGER!
Detach water hose at thermostat housing.
Detach strap holding wires.
Installation: Replace wire holding strap.

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Detach holder (1) at branch flange.
Remove round plug (2) from holder.

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Detach transmitter (3) at holder (4) and pull out
upward.
Installation: TDC mark on vibration damper
aligns with cast tab on timing case cover.

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Loosen holder (4).
Attach local manufactured gauge (6) on contact
pin (5).
Position TDC position sensor against gauge.
Tighten holder (4) in this position.

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Sketch for Local Manufacture of Gauge (6):
Dimensions given in mm.
Dimensions apply to BMW 630 i.
Different dimensions for BMW 633 i are given
in brackets ( ).

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Vehicles after change point in 1982
Pull off plug.

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Engine S 38:
Disconnect plug.

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Loosen screw and take off position sender.
Installation:
Make sure sender seats correctly.
Check gap A = 0.2 ... 2.0 mm (0.008 ... 0.079") between transmitter and vibration damper.

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