Crankshaft Pulley - Correct Timing Mark Information
84porsche02Subject:
Crankshaft Pulley Timing Mark; Ignition Timing
Part Identifier 1376
Applies To
911 CARRERA
1984
Group
28
Key Points Installation of required 25~ timing mark Ignition timing, checking
Number
84-02
March 16, 1984
Crankshaft pulleys installed in production as of September 14, 1983; Engine no. 64E00474, have a 25~ mark for checking ignition timing.
Previously produced vehicles are equipped with a crankshaft pulley that has a 29~ timing mark. This mark is not applicable to 911 Carrera engines.
Pulleys with correct 25~ timing mark can be installed on these earlier vehicles.
Pulleys with 25~ timing mark:
^ Part no. 930.102.128.08 without A/C
^ Part no. 930.102.024.03 with A/C
Procedure for correcting pulleys with 29~ mark
- turn engine to TDC on cylinder #1, then turn engine counter-clockwise until TDC notch is approximately 30 mm from center line.
- make a mark on pulley 27 mm to the right of TDC notch, using calipers or a compass to measure.
a = 27 mm (25~ cord length) b = 27.7 mm (25~ arc length)
- using small triple-edged file, make 1 mm deep notch
- paint notch with bright colored paint
Full throttle ignition timing, checking
^ Specification = 25 +/- 3~ BTDC @ 3800 RPM
Timing value can be checked with VAG 1367 tester or with a stroboscope lamp on 25~ timing mark.
Note
The value is not adjustable
Procedure requirements
- terminals B and C of test jack must be bridged together. This simulates full throttle on control unit and stops operation of idle regulator.
- engine oil temperature approximately 90~C (194~F)
- all electrical consumers switched OFF
- distributor rotor correctly installed in relation to mark on distributor housing
Note
Idle speed ignition timing can only be checked with VAG 1367 tester. This requires bridging terminals B and C of test jack to stop operation of idle regulator.
^ Idle speed ignition timing specification = 3 +/- 3~ ATDC @ 800 +/- 40 RPM