Indian Cylinder Liners' Informational Blog

by Liner Sleeves Auto Industries

Take a Tour Of Lubrication Mechanism For Snap Ring and Piston Pins

Different kinds of piston pins are used for completing the connection between a piston and rod. Some of them are full floating in both a piston and connecting rod; some are journalled in piston bosses.


In recent years, manufacturing units have made attempts of using a ceramic piston pin instead of steel made pin in order to decrease the friction losses, weight, and other cons of the engine. They discover an issue while trying this job and it was excess of wear in snap rings when they came contact with the ceramic piston pin. This further affects the unit and damages the cylinder liner.

Engineers may solve this issue by using the piston pin of which end surfaces in contact with the smooth finished snap rings. This is a costly affair and many engineers look for alternative ways to solve this issue. They prepare snap rings with costly metal that offers excellent wear resistance. It is still costly, but this method seems more effective and durable in nature.

About mechanism of lubrication

A lubrication mechanism includes-

1. Internal combustion engine

  • A piston that is equipped with piston boss formed with a bearing surface
  • A piston pin journalled 
  • A groove cut

2. Piston includes a scraper ring groove for retrieving in a scraper ring
3. Oil inlet hole contains an inlet end located at an ICP of piston. *ICP- inner circumferential periphery.
4. Second inlet hole is arranged in a way it makes 90 degrees angle
5. A lot more stuff that you can explore online.

Contact liner sleeves manufacturers to learn about this mechanism. Get professional tips and guidelines if you want to perform lubrication for your piston pins. It is suggested to include at least one professional when you perform this task.