C. Obert & Co. (formerly Fiat Plus)- Ignition Helper

Tech Tip for June 1998

128 & X1/9 Ignition Helper

Taken from Ciao!NEWS, Volume 2 Number 2, Fall 1995

Click here for the written Instructions.

CHECK CAM TIMING

  • #1.
  • Turn engine to align camshaft timing mark with pointer on belt cover backing plate.
  • Check that flywheel timing mark aligns with 0 degree mark on bell housing. If not, adjust cam timing (install new timing belt). Engine is now set to fire on No. 4 cylinder.

DISTRIBUTOR AND ROTOR POSITION

  • #2
  • If distributor is removed, mark distributor and rotor positions. Check point condition. Renew if required.
  • Check rotor resistance (5K + or minus 10%).

SETTING POINT GAP

  • #3
  • Adjust new point set for .015 to .017 inch gap.

SETTING TIMING

  • #4
  • If removed, install distributor. Be sure of position.
  • Set rubbing block for points as shown.
  • Slowly turn distributor counter-clockwise
    until points just break open. (Use test light.)
  • Finger tighten distributor holddown nut.

SETTING DWELL ANGLE

  • #5
  • For normal altitude version cars, block vacuum line to
    vacuum retard. For high altitude version cars, connect vacuum line to vacuum retard.
  • Connect tach/dwell meter.
  • Crank engine. Check for 52 degrees to 58 degrees dwell.
    If required, adjust point gap and timing.

SETTING TIMING & ADVANCE

  • #6
  • Install rotor and distributor cap. Check that spark plug
    wires are connected correctly.
  • With engine at operating temperature, check for 10 degrees
    BTDC timing at 800 to 850 RPM. Adjust if required.

CHECKING IGNITION RETARD

  • #7
  • Connect vacuum line to vacuum retard.
  • Check for ) degrees + or minus 1 degree(TDC) timing.
    If vacuum retard timing is correct, fully tighten distributor holddown nut. Adjust carburetor settings.

ADJUSTING RETARD

  • #8
  • If vacuum retard timing is not correct, stop engine and remove distributor cap and rotor.
  • Press retard follower cap toward spring, then turn eccentric star wheel clockwise to decrease retard, or counterclockwise to increase retard.
  • Install rotor and distributor cap, then recheck timing.
  • Fully tighten distributor holddown nut. Adjust carburetor settings.
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