Contents: Models 14 NV and 16 SV ⬇ Other models ⬇
Note: Before you begin, see. Chapter 3. To perform this procedure, you will need a tachometer and a stroboscope. To adjust the ignition timing, you must operate the car on unleaded gasoline (see Chapter 22).
Models 14 NV and 16 SV
Examination
1. Start the engine and allow it to warm up to normal operating temperature, then turn it off.
2. On 14 NV models, disconnect the vacuum line from the distributor vacuum block.
3. On all models, use a wrench on the bolt on the pulley to turn the crankshaft clockwise until the notch in the inner rim of the pulley aligns with the protruding pointer on the oil pump housing.
On 14 NV models, where there are two notches (indicating 10° and 5° BTDC respectively), rotate the crankshaft until it aligns with the second notch (in the direction of rotation - i.e. 5° BTDC).
Use white paint or something similar to draw a line between the marker and the cut to make them easier to see.
4. Connect the strobe light to the high tension wire of cylinder #1 (closest to the toothed drive belt), and also connect the tachometer (follow the manufacturer's instructions).
5. Start the engine and let it idle - the speed should be in the range of 700-1000 rpm.
6. On 14 NV models, aim the timing light at the pointer and check that it aligns with the notch in the crankshaft pulley.
7. On early 16 SV models, disconnect the main timing coding plug.
It can be identified by the Black wire connected to the Brown/Red and the Brown/Yellow wire connected to the heating/cooling system wiring connector below the battery/ignition coil (see illustration 16.1).
This sends a constant signal to the MSTS-i unit, corresponding to 10° BTDC, eliminating advance at engine speeds below 2000 rpm. Point the stroboscope at the pointer, it should appear aligned with the notch on the crankshaft pulley.
8. On later models 16 SV, C16 NZ and C16 NZ2, coding plugs are not used. For an accurate check, special Opel equipment must be used.
9. Without such equipment, it is possible to check and adjust the ignition timing, but the accuracy of the results cannot be guaranteed. Therefore, we recommend that you contact an Opel dealer to perform this work, at least do the initial installation yourself, and then check with the dealer as soon as possible.
10. If you are trying to check the ignition timing yourself, pay attention to how the mark is installed on the extension of the relief line on the lower outer cover of the toothed drive belt.
Adjustment
11. If the notch and pointer are not aligned, loosen the distributor clamp nut and turn the housing slightly in the required direction.
12. Tighten the distributor nut and check that the notch and pointer are aligned.
13. Turn off the engine, disconnect the stroboscope and tachometer.
14. On 16 SV models, attach the main adjustment coding plug. On 14 NV models, connect the vacuum tube to the distributor vacuum block.
Other models
15. On 1.8 and 2.0 liter models, it is impossible to adjust the ignition timing; adjustment is performed by the automatic control unit.
16. The ignition timing can be checked by an Opel dealer using special testing equipment.
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