Cylinder Liner Sleeve 3904166 for Cummins ISB, QSB & B Series – OEM-Grade Replacement

Product Specifications

Compatible Models

Frustrated by Cylinder Liner Failures on Your Cummins ISB or QSB Engine?

Every unplanned engine shutdown costs thousands in downtime — especially during peak construction or mining cycles. Counterfeit liners cause premature scuffing, coolant leakage, and piston seizure within weeks. OEM replacements take 2–4 weeks to arrive, halting critical operations. And sourcing reliable parts across multiple Cummins models — from B5.9 to ISB6.7 and QSB5.9 — is time-consuming and error-prone.

OEM-Equivalent Quality, Ready to Ship from Guangzhou Warehouse

This Cummins cylinder liner sleeve 3904166 is engineered to match original dimensional tolerances and metallurgical specs — not just appearance. Built by ISO-certified factories, every batch undergoes incoming material inspection and final performance validation before shipment. For field service teams maintaining ISB6.7-powered excavators or QSB5.9-equipped loaders, this means no rework, no fit-up delays, and full confidence during engine rebuilds.

Where This Part Works

This Cummins ISB liner sleeve operates under high thermal load and mechanical stress in heavy-duty applications: quarry haul trucks running 16+ hours daily, port-side container handlers in humid salt-air environments, and demolition excavators performing repeated high-torque digging cycles. In these conditions, liner integrity directly affects combustion efficiency, oil control, and coolant containment — making precise bore geometry and surface hardness non-negotiable.

Engineering Details That Matter

Manufactured from high-grade centrifugally cast alloy iron with controlled graphite morphology for uniform wear resistance. Hardness is maintained at 220–260 HB throughout the working surface, preventing micro-welding with piston rings under boundary lubrication. Honing finish meets ISO 4287 Ra ≤ 0.4 µm for optimal ring seating and oil retention. Outer diameter tolerance is held to ±0.015 mm to ensure correct interference fit in the cylinder block — critical for heat transfer and structural stability. All units receive phosphate + oil corrosion protection for long-term storage without degradation.

The Real Cost of Wrong Parts

A $45 counterfeit liner may seem economical — until it fails after 200 operating hours, triggering a $2,800 engine teardown, $1,200 in labor, and $15,000 in project delay penalties. Genuine-spec replacement like this Cummins QSB engine liner delivers 12,000+ hour service life when installed correctly, matching OEM torque retention and thermal expansion behavior. Total cost of ownership drops 37% over three years versus low-cost alternatives — verified across 213 fleet maintenance audits in North America and Southeast Asia.

Why Customers Trust XUNPO

Packaging & Shipping

• Each liner is individually sealed with rust-inhibiting VCI film, cushioned in custom foam, and packed in reinforced corrugated box
• In-stock items ship within 2–5 working days after order confirmation
• Flexible logistics: DHL/FedEx/UPS express, air freight, or sea freight — selected per your urgency and volume
• Real-time tracking provided from Guangzhou warehouse to your facility door
• MOQ is 1 piece — designed for urgent repairs and small-batch engine rebuilds

Get Your Cummins 3904166 Cylinder Liner Sleeve Now

Your machine isn’t generating revenue while it’s idle. Send us your exact part number, engine model (e.g., QSB5.9 CM550), and required quantity — we’ll issue a competitive quote within 24 hours. First-time buyers can request a sample for physical verification before placing bulk orders. Stock ships fast; downtime doesn’t wait.

Frequently Asked Questions