Piston+ring set φ83 6-pack pistons for Land Rover 3.0T Petrol/306PS AT300 Engine parts piston kits LRHS306PS Auto engine piston

Product Description:

Car piston

OE numbers: LRHS306PS

Applicable vehicle type: For Land Rover

The piston in a car engine is a crucial component. It moves reciprocally within the cylinder, converting the energy produced by fuel combustion into mechanical energy.

Function and role:

• The piston, together with the cylinder head and cylinder wall, forms the combustion chamber. It withstands the explosive pressure of the gases (up to 80–120 bar, with instantaneous temperatures reaching up to 2000 °C in diesel engines).
• It transmits the linear thrust through the piston pin and connecting rod to the crankshaft, completing the conversion of chemical energy to mechanical energy.
• The piston rings control oil consumption and heat dissipation (over 60% of the heat from the top of the piston is transferred to the cylinder wall via the ring group).

After disassembling the engine, directly observe the appearance of the piston. If the following conditions exist, it can be determined that replacement is needed without measurement:

• Piston top erosion/melting: obvious indentation, missing corners, metal melting marks on the top (usually due to prolonged knocking or injector failure), or excessive carbon buildup with localized blackening (indicating high-temperature damage caused by abnormal combustion).
• Piston cracks: cracks found at the top edge of the piston, near the piston pin hole, or on the side of the skirt (a strong light can assist in observation). Even if the cracks are small, they will gradually expand under high temperature and high pressure conditions, leading to severe mechanical accidents (such as piston fracture and cylinder wall penetration).
• Severe damage to the piston skirt: obvious scratches, deformation, or indentations on the skirt (usually due to lubrication failure causing dry friction), or complete wear and take of the wear-resistant coating on the skirt surface (such as graphite coating), making it unable to guide the piston's stable movement.
• Deformation or excessive wear of the piston pin hole: obvious steps or scratches on the inner wall of the pin hole, or the piston pin can 'wobble' within the pin hole (normal should be slight interference fit, requiring special tools to remove the piston pin), indicating that the pin hole wear has exceeded the allowable range.

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