This article discusses the typical damage that occurs when the circlip damages a piston. It includes details on why the piston may operate at an uneven angle, harming the piston itself, causing damage by axial thrust, and causing damage through other comparable causes such as having a damaged circlip.
Continued Piston Circlip Damage
The piston pin circlip in this instance has been hammered out as a result of the piston operating at an angle. The piston pin broke (Fig. 6) as a result of the piston operating at an angle in the cylinder and the one-sided stress on the piston pin; as a result, the piston also broke (Fig. 5). It is rather evident that the piston is operating at an angle, resulting in an uneven running pattern (Fig. 4).
Evaluation of Damages
The piston pin circlip, whether it is made of wire or Seeger type, can only be hammered or forced out during operation by means of an axial displacement of the piston pin. This, however, is predicated on the stipulation that the circlip has been put accurately and has not sustained any damage. When the piston pin axis is not parallel to the crankshaft axis while in operation, axial thrust in the piston pin always results. This is most frequently the case when the piston runs at an angle due to a bent connecting rod. The piston’s reciprocating motions produce an alternate axial thrust that essentially hammers out the circlip that is oriented in the direction of main pressure. After the circlip jumps out, it gets clamped between the piston and the cylinder running surface, with the piston pin traveling in an outward direction. There, it eventually breaks into multiple bits after becoming worn away. As shown in (Fig. 2), the pieces pound into the piston and break it down very quickly due to the piston’s reciprocating movements and their own inertia forces. Additionally, as pieces pass through the hollow piston pin, the opposing side of the piston experiences the corresponding damage.
Potential sources of harm
When the engine is running, the conrod may bend or twist, causing an axial thrust on the piston pin. tiny ends of conrods not drilled parallel to the axis of the crankshaft The crankshaft axis and the cylinder axis are not rectangular. Greater than necessary connecting rod big-end bearing clearance, especially when combined with asymmetric connecting rods, worn or broken circlips, or circlips that are not mounted correctly.
