+0.5mm Oversize Piston Kit with High-Strength Forged Aluminum Alloy and Wear-Resistant Coating for CAT C7.1 Excavator Engine

For 391-3732 3913732 Plus 0.5mm Piston Kit CAT C7.1 Excavator Engine Parts

Specification

Description

This +0.5mm oversize piston kit with part number 391-3732 is specially designed for overhaul and upgrade of C7.1 series diesel engines installed on excavators. The complete set includes piston body, matched piston rings, circlips and all necessary installation accessories. Adopting precision boring oversize specification, it perfectly fits engine overhaul scenarios where cylinder liner inner wall is worn. Manufactured with standardized precision machining technology, all key dimensions strictly comply with assembly tolerance standards for direct replacement installation. It is widely compatible with various construction machinery excavators equipped with C7.1 engines, effectively solving common engine faults including excessive cylinder clearance, high blow-by gas, engine oil burning and power attenuation, serving as a core replacement part for engine overhaul.

Advantage

Precise Oversize Matching: The standard +0.5mm oversize dimension targets cylinder wear repair. Engine maintenance can be finished without replacing cylinder liners, which greatly cuts overhaul cost and construction working hours.
Complete Accessory Package: Pre-assembled piston rings and matched circlips are included in one set. No extra spare parts purchase is required, avoiding mismatching or missing parts and greatly improving maintenance efficiency.
High-precision CNC Machining: Key positions including piston pin bore, ring grooves and combustion chamber are precisely milled by CNC equipment with clear positioning marks, ensuring perfect assembly fit and eliminating tolerance deviation.
Wear-resistant Surface Coating: The piston skirt is treated with professional wear-resistant coating to reduce friction loss during reciprocating movement, featuring excellent anti-scuffing and anti-abrasion performance for heavy-duty harsh working conditions like mines and construction sites.
Wide Compatibility & Stable Supply: Manufactured in accordance with standard assembly parameters, it is highly compatible with multiple excavator models equipped with C7.1 engines. Sufficient spot inventory guarantees stable delivery with low after-sales fitting failure rate.

Performance

High-efficiency Sealing & Fuel-saving Performance: Three-piece piston rings achieve tight sealing for combustion chamber, preventing engine oil upward leakage and gas downward blow-by. It effectively resolves oil burning and blue exhaust smoke issues, restores standard fuel economy and reduces operating fuel consumption.
Excellent High Temperature & Pressure Resistance: Made of high-strength forged aluminum alloy, the piston can withstand long-term high temperature and in-cylinder explosion pressure without deformation, cracking or combustion ablation, ensuring continuous stable power output.
Low Friction & Long Service Life: Optimized curved piston skirt with wear-resistant coating features low friction coefficient and low operating noise, greatly extending engine service life after overhaul and reducing times of repeated secondary maintenance.
Rapid Power Recovery: Precise cylinder sealing restores original engine compression ratio and in-cylinder explosion pressure, quickly recovering rated power output to eliminate equipment faults such as speed drop, power stall and weak climbing performance.
Stable & Reliable Operation: Strict dimensional tolerance ensures smooth piston reciprocating movement inside cylinders, bringing stable engine idle speed, low vibration and smooth power output under heavy loads, ideal for long-term continuous high-intensity construction operations.

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