Malfunctions of a manual gearbox (Opel Vectra C)

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

1. The input 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.

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).

Source is on the website: opelbook.ru

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.

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.

Complications when shifting gears

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

2. The gear shift drive cables are damaged or the drive adjustment is out of order. Carefully check the condition of the components, replace the defective ones if necessary, and adjust the drive.

There are transmission oil leaks

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

2. The differential seals need to be replaced.