There are 3 main symptoms to look out for when diagnosing a manual gearbox:
When a vehicle jumps out of gear, 99% of the time this is due to a gear being worn. Unfortunately, over time the contact pattern of the gears wears down and the 2 gears no longer mesh correctly. The most common cause of this symptom is high mileage and simple wear & tear.
This is the most basic symptom to diagnose because when you drive the vehicle, the gearbox will jump out of gear.
Noise is by far the most difficult problem to diagnose. The main causes of noise can be worn/noisy bearings; gear meshing (wear & tear); lack of oil (Burnt Gears) or Excessive play on the gears/shafts.
When diagnosing a noise in a gearbox, it is important to test the noise in various states before coming to a conclusive diagnosis.
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