Clash shifting I - Gear defects

Clash shifting I - Gear defects - Other defects

Figure 1: Failure to use the clutch can cause worn clutching teeth, a major cause of transmissions jumping out of gear. Shown here are worn clutching teeth (left) and new clutching teeth (right).

Defect name: Clash shifting
Record No.: 2137
Type of defect (Internal/Surface): Surface
Defect classification: Gear defects, other defects
Steel name: Steel
Steel composition in weight %: No data.
Note: A fourth common cause of gear failure is clash shifting. When a driver shifts a transmission before the engine and transmission speeds are matched (or before the synchronizer can do its job), a clutch collar is forced into gear. The result is worn clutching teeth that can lead to the transmission jumping out of gear (see Figures 1). Gears, collars, or shafts with worn clutching teeth or gearlocks should be replaced.
Reference: Not shown in this demonstration version.