4083244 4374086 Piston Pin Fits Cummins Engine Piston Wrist Pin Replacement Spare Part

Product Overview

4374086 Piston Pin (PIN,PISTON) is an important transmission component inside Cummins series diesel engine cylinder assembly. It penetrates piston pin boss and connecting rod small end, forming movable connection between piston and connecting rod. It transfers impact load generated by fuel combustion from piston to connecting rod.

This piston pin solves typical engine faults including pin surface abrasion, pin boss ablation, abnormal knocking and power loss caused by fatigue, surface peeling and deformation of aging piston pins.

Core Product Advantages

1. High-Quality Alloy Steel & Integral Heat Treatment

   Premium alloy steel raw material, after quenching and tempering treatment. High surface hardness with tough core, outstanding impact resistance, anti-fatigue and anti-cracking performance under alternating impact load.

2. Precision Fine Grinding Machining

   Outer diameter surface precision grinding, low roughness, form stable lubricating oil film, reduce friction with piston boss and connecting rod small end, prevent dry friction ablation.

3. Strict Dimensional Tolerance Control

   Accurate outer diameter and straightness, guarantee reasonable assembly clearance, avoid excessive clearance leading to knocking noise or too tight fit causing seizure.

4. Excellent Temperature Adaptability

   Stable mechanical performance under frequent cold and hot alternation inside cylinder, no thermal deformation under long-term high-load operation.

5. Anti-Oxidation Surface Protection

   Surface passivation anti-rust treatment, avoid rust during storage and assembly, protect precision outer circle surface.

6. Standard Matching Specification

   Dimension 12cm7cm7cm, weight 1.4KG, perfectly match supporting piston and connecting rod of Cummins engine, direct replacement without secondary processing.

7. Multi-Item Factory Inspection

   All piston pins pass hardness test, straightness inspection, dimensional screening and fatigue test, stable batch quality for engine overhaul factories and transport fleets bulk procurement.

Basic Product Parameters

• Part Number: 4374086

• English Name: PIN, PISTON

• Product Name: Piston Pin / Wrist Pin

• Applicable Engine: Cummins Series Diesel Engines

• Overall Dimension: 12cm 7cm 7cm

• Product Weight: 1.4KG

• Main Material: Heat-treated high strength alloy steel

• Working Temperature: Alternating high and low temperature inside engine cylinder

• Core Function: Connect piston and connecting rod, transmit combustion impact load

• Key Features: High hardness, wear-resistant, impact resistant, anti-fatigue, precise size, low friction

• Installation Position: Piston pin boss and small end of connecting rod

• Package: Neutral export carton, independent anti-rust oil paper packaging, prevent precision surface scratch and oxidation

Application Scenarios

Suitable for heavy-duty trucks, construction machinery, mining equipment and diesel generator sets equipped with Cummins diesel engines. Adapt to long-distance full-load transportation and frequent start-stop working conditions. Effectively eliminate abnormal knocking inside cylinder and prevent piston assembly failure.

Purchase Reminder

Please confirm part number 4374086 and Cummins engine model before ordering to ensure accurate compatibility. We support global bulk wholesale for auto parts distributors, engine overhaul workshops and transport fleets with sufficient stock and competitive prices. Piston assembly clearance installation guidance is provided after sales.