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Cummins diesel engine parts piston piston pin


Detailed Description:

Piston piston pin physical map and parameter model is for reference only: For specific price models, please contact our sales online customer service,

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Cummins diesel engine piston overhaul

1.Piston skirt wear and maintenance

(1) Skirt wear phenomenon

1) Normal abrasion phenomenon: the right side of the skirt is worn to a lesser extent;

Reason: The right side of the pressure skirt on the work side comes into contact with the cylinder wall and rubs.

2) Abnormal abrasion phenomenon: Improper fit clearance will aggravate skirt wear.

① Large clearance: impact wear (cylinder knock)

② Small clearance: ablation wear, even (cylinder)

(2) Skirt wear detection

Measure the diameter of the outer circle with an outside micrometer or vernier caliper.

Specific parts: from the beginning of the upper part of the skirt 10-20mm, measured every 100-200mm, each measuring two diameters in the same section perpendicular to each other: the direction parallel to the crankshaft and the direction perpendicular to the crankshaft. Calculate roundness and cylindricity.

(3) Skirt wear repair

Machining Molybdenum Disulfide Surge (0.05-0.07㎜) + Finishing

(1) Abrasion phenomenon: The groove side is severely worn, the first ring is severe, and it gradually decreases from top to bottom.

(2) Cause: Backlash exists, air pressure, ring groove impact, severe wear, corrosion and wear.

(3) Consequences: increased backlash, oil channeling, intensified pump oil, air leakage, etc.

(4) Detection: template + feeler

3.Piston head ablation

(1) Phenomenon: The layer of metal on the top of the piston exfoliates and gradually reduces the thickness of the top. Vanadium corrosion pits or pits appear on the top of the piston. This phenomenon is called piston top ablation. In severe cases, the top can burn through.

(2) Reason: Ablation: long-term overload, deflagration, oxidative corrosion, etc.

(3) Consequences: reduced strength, affecting compression ratio

(4) Repair: renewal, surfacing + bare car

4. Overhaul of piston pin hole wear

(1) Phenomenon: Ellipse wear of long axis along piston axis.

(2) Reason: air pressure, inertia force, repeated impact, alternating motion, semi-dry friction and wear.

(3) Consequences: The pin hole clearance increases, abnormal noise (pin noise) occurs, and the impact intensifies.

(4) Detection:

Test items: diameter, roundness, cylindricity, etc.

Method: The inner diameter gauge and the outer micrometer are measured separately.

(5) Repair: Reamer reaming process, while replacing the piston pin to make it fit.

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