PINION NUT 90170-16M19

Function and technical context

This pinion nut is a critical component of the transmission system that ensures the fixation of the pinion on the output shaft of the marine engine. It works in the tail gear system, where it transmits the rotational power of the engine to the propeller with absolute mechanical stability. Its correct fixation is essential to avoid axial displacement of the pinion, which would cause excessive vibration, loss of traction and damage to adjacent bearings. Poor tightening or progressive wear of this nut can cause play in the transmission and, in extreme cases, complete misalignment of the propulsion system.

When to replace this part?

Symptoms of deterioration include abnormal vibration at the stern during acceleration, metallic noise coming from the tail pan, or observable movement of the pinion on the shaft when trying to turn it manually with the engine stopped. It is recommended to inspect the tightness of this nut every 200 hours of navigation or at least once a season, especially after navigation in waters with debris or impacts against submerged objects. The preventive replacement of damaged nuts or those with signs of corrosion avoids costly emergency repairs and guarantees the reliability of the transmission in offshore navigation.

Equivalent manufacturer part numbers