OE NO. 4D30/54-83401/134966/1.01.0957.0/M357T61671/M357T71671

Starter Drives

This starter drive shaft assembly is a vital precision part within the starter transmission path. It transfers torque smoothly from the motor to the overrunning clutch to crank the flywheel. After the engine starts, it allows relative sliding under speed difference, protecting internal starter gears from damage caused by reverse impact.

  • Internal Model No: T83401
  • Material: 20CrMnTi
  • Feature: Quenched‑and‑tempered shaft body, delivers good overall toughness against torsion bending
  • Application: Automotive starter motors

Abnormal noise, delayed engagement or unstable torque delivery do not always mean a faulty motor. Quite often they are triggered by worn splines, scratched shaft surfaces or excessive clearance on the drive shaft. Many look‑alike replacement parts only match in outer shape, without precise control over spline module, shaft straightness and transition fillets, which leads to sticking and accelerated wear under continuous load.