Note: Before you start, see Chapter 3. To perform this procedure, you will need a tachometer and a stroboscope. To adjust the ignition timing, it is required to operate the car on unleaded gasoline (see chapter 22).
Models 14 NV and 16 SV
Examination
1. Start the engine and let it warm up to normal operating temperature, then shut it off.
2. On 14 NV models, disconnect the vacuum pipe 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 outward pointer on the oil pump housing.
On 14 NV models where there are two notches (indicating respectively 10°and 5°BTDC), rotate the crankshaft until aligned with the second notch (in the direction of rotation - i.e. 5°to TDC).
With white paint or something similar, draw a line between the marker and the notch to make it easier to see them.
4. Connect a stroboscope to the high voltage wire of cylinder #1 (closest to toothed drive belt), and also connect a tachometer (follow the manufacturer's instructions).
5. Start the engine, let it idle - the speed should be in the range of 700-1000 rpm.
6. On 14 NV models, aim the strobe at the pointer and check that it aligns with the notch in the crankshaft pulley.
7. On early 16 SV models, disconnect the main ignition timing coding plug.
It can be identified by the Black wire connected to Brown/Red and the Brown/Yellow wire connected to the heating/cooling wiring connector below the battery/ignition coil (see illustration 16.1).
Thus, a constant signal is sent to the MSTS-i unit, corresponding to 10°BTDC, to eliminate the lead at engine speeds below 2000 rpm. Aim the strobe at the pointer, it should appear aligned with the notch on the crankshaft pulley.
8. On late models 16 SV, C16 NZ and C16 NZ2, coding plugs are not used. For an accurate check, you must use special Opel equipment.
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 advise you to contact an Opel dealer to carry out 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 sign is set 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 rotate the body slightly in the desired 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 primary adjustment coding plug. On 14 NV models, connect the vacuum tube to the distributor vacuum block.
Other models
15. On models 1.8 and 2.0 liters, it is impossible to adjust the ignition timing, the adjustment is carried out by the automatic control unit.
16. Ignition timing can be checked by an Opel dealer using special test equipment.
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