Malfunctions of manual transmission (MT) (Opel Astra H)

51. When the manual transmission is set to neutral, extraneous noises occur while the engine is running

1. The primary shaft bearing is worn out

2. The bearing of the driven shaft drive gear is damaged.

3. The intermediate shaft bearings are worn out.

4. The shaft axial play adjustment washers are worn or damaged

52. Extraneous noises occur in any position of the manual transmission

1. Any of the above reasons and/or

2. There is not enough transmission oil in the manual transmission (his level dropped).

53. Extraneous noises occur in a particular gear

1. The gear teeth of this transmission are worn, damaged or chipped

2. The synchronizer of this gear is worn out or damaged

54. The manual transmission "jumps" out of the highest gear

1. Dirt has gotten between the gearbox and the engine, or the gearbox has shifted relative to the engine

55. Complications arise when shifting gears

1. The clutch is not fully depressed (disengaged).

2. The shift rod is damaged, loosened, or out of adjustment.

Perform a thorough check of the condition of the components and replace any defective ones if necessary.

56. There are transmission oil leaks

Source is on the website (www.OPELBOOK.ru)

1. There is too much transmission oil in the manual transmission. Drain the excess if necessary.

2. The differential seals need to be replaced.