FixVault
Home › BMW › 1980 › 633CSi Automatic Trans › Repair and Diagnosis › Engine Performance › Tune-Up › Tune-Up - 6 CYL › Ignition Timing

Ignition Timing

  1. Check and adjust timing with engine at normal operating temperature and distributor vacuum hoses disconnected. Connect timing light, start engine and increase engine speed to specified timing RPM. Steel ball embedded in flywheel (long pin on Auto. Trans, models) should line up with pointer attached to hole in flywheel housing.
  2. Loosen distributor clamp, turn distributor until proper timing is achieved and tighten clamp. Connect distributor vacuum hoses and set idle speed to specified RPM.
Ignition Timing Specifications

Application RPM Dynamic Timing
528i 2100 22° BTDC
633CSi & 733i 1650 22° BTDC
Fig 1: Ignition Timing Mark In Window of Flywheel Housing
G09351025Courtesy of BMW OF NORTH AMERICA, INC.
About FixVault