Note: Checking and adjusting the level should only be done if oil leaks from the manual transmission are detected. In other cases, there is no need to do this.
32. First of all, it is necessary to carry out a thorough visual inspection of the box for possible oil leaks. To do this, clean the box body from dust, dirt and traces of oil, sprinkle possible leaks with talc. The most likely leaks are:
- Mating surfaces of the engine and manual transmission;
- Primary shaft seals for manual transmission;
- Filler cap;
- Drain plug.
Before the control check, it is necessary to warm up the manual transmission oil thoroughly during a short (up to 30 km) trip.
33. Drive the car onto a ramp or inspection pit, or jack it up and place it on supports in a strictly horizontal position. If an oil leak is detected, first eliminate its cause, and then adjust the oil level in the manual transmission.
34. Carefully wipe the surface of the gearbox housing around the inspection plug. If necessary, remove the protective cover of the engine compartment. The inspection hole is located on the left rear of the gearbox (behind the drive shaft) (see accompanying illustration).
4.34. Location of the manual transmission inspection hole
35. To check, unscrew the plug of the inspection hole and measure the oil level in the manual transmission crankcase using a wire bent at 90° - the oil level should not fall below the edge of the inspection hole by more than 20 mm (minimum acceptable level).
[Article posted on an online resource: opelbook]
36. If necessary, the level is adjusted using a special syringe/oiler through the hole for installing the reverse light switch sensor (F13/F17/F17+ manual transmission), or through a special hole located on top of the gearbox housing (F23 manual transmission) - disconnect the electrical wiring connector (with appropriate equipment) and unscrew the sensor/plug. On models equipped with the Easytronic robotic gearbox, to adjust the oil level, it is necessary to unscrew the crankcase ventilation breather located on the gearshift mechanism cover. Oil should be poured until its level reaches the lower edge of the inspection hole.
Note: Transmission oil is very viscous - it takes time for it to spread evenly throughout the entire volume of the gearbox housing. Make adjustments in several stages, do not add too much oil at once, check its level periodically. If oil starts to leak out of the edge of the inspection hole, allow the excess to drain.
37. After completing the adjustment, tighten the inspection hole plug back to approximately 4 Nm and tighten it with a wrench approximately another 1/8, maximum 3/8 of a turn (45°-135°). On a robotic gearbox, tighten the breather with the same force. When installing the reverse light switch sensor, first replace the sealing gasket and tighten it to 20 Nm. For the F23 transmission, the tightening force for both the inspection and filler hole plugs is 35 Nm.
38. To ventilate the crankcase, a special breather with a cover is screwed into the manual transmission housing. Every time you inspect the manual transmission, check the breather cover - it should fit loosely onto the breather. If the breather is clogged, (fixed seated lid) increased pressure is created in the manual transmission housing, which can cause malfunction of the manual transmission, as well as lead to extrusion of seals and leakage of transmission oil.
39. After completing the work, remove traces of oil from the gearbox, remove the tool from under the car and lower the latter to the ground if it was jacked up or lifted. During the first trips, check the gearbox for leaks.
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