Cylinder Liner Sleeve 3904166 for Cummins Engine 4B3.9 6B5.9 B3.3 B5.9 G5.9 ISB ISB6.7 ISBE ISBE4 QSB3.9 QSB4.5 QSB5.9 QSB6.7

Product Specifications

Compatible Models

Tired of Cylinder Liner Failures on Cummins ISB and QSB Engines? Get the Right 3904166 Liner Sleeve for Reliable Engine Rebuilds

Every unplanned engine shutdown on a construction site or mining fleet costs thousands in lost productivity — especially when caused by premature liner wear or improper fit. OEM parts demand 3–4 weeks lead time and carry 40% price premiums. Counterfeit liners fail within 500 operating hours, triggering costly rework and downtime. And sourcing correct-fit cylinder liners across multiple Cummins B-series platforms remains a daily challenge for repair centers and fleet managers.

OEM-Equivalent Quality, Ready to Ship from Guangzhou Warehouse

This 3904166 liner sleeve meets original Cummins dimensional and metallurgical specifications — verified by performance testing before shipment. Backed by 10 years of global export experience and 20+ in-house technical engineers, we supply over 10,000 SKUs for heavy equipment engines. Each liner is produced in ISO-certified factories, inspected for bore roundness (±0.005 mm), surface finish (Ra ≤ 0.8 μm), and hardness (HB 220–260) — ensuring stable combustion seal and long service life during high-load excavation or quarrying operations.

Where This Part Works

This liner sleeve operates under extreme thermal cycling and high cylinder pressure in demanding applications: earthmoving on construction sites, continuous-duty mining haulage, port container handling, and demolition work where engine uptime directly determines contract compliance. In these conditions, liner integrity prevents coolant leakage into oil, avoids piston ring scuffing, and maintains compression ratio — making precise material selection and dimensional accuracy non-negotiable. Cummins ISB6.7 CM2250 cylinder liner 3904166 is engineered specifically for such environments.

Engineering Details That Matter

Forged nodular cast iron (ASTM A536 Grade 100-70-03) delivers superior thermal stability and fatigue resistance versus standard gray iron — critical for ISB and QSB engines running at sustained 1,800–2,200 RPM. The honed internal surface features a plateau finish optimized for rapid ring seating and minimal break-in wear. Precise outer diameter tolerance (−0.015 mm / −0.030 mm) ensures proper interference fit in the block without distortion. Heat-treated after machining to eliminate residual stress, each liner undergoes vacuum impregnation to seal micro-porosity and prevent coolant seepage at operating pressures up to 120 bar.

The Real Cost of Wrong Parts

A $120 counterfeit liner may seem economical — until it cracks at 300 hours, contaminating oil with metal particles, scoring the crankshaft, and requiring full short-block replacement ($3,200+). Industry data shows substandard liners increase total cost of ownership (TCO) by 2.7× due to repeat labor, collateral damage, and 3–5 days of idle equipment. Genuine OEM-equivalent parts like this 3904166 liner sleeve meet SAE J1397 and ISO 9001 standards — delivering predictable 12,000+ hour service life and eliminating hidden failure modes. Cummins QSB5.9 CM850 liner sleeve replacement must match original thermal expansion coefficients; our units are validated per Cummins Engineering Bulletin EB-442.

Why Customers Trust XUNPO

Packaging & Shipping

• Individually wrapped with rust-inhibiting oil, placed in custom foam inserts, and secured in reinforced corrugated cartons
• In-stock items ship within 2–5 working days from Guangzhou
• Flexible logistics: Express (DHL/FedEx/UPS), air freight, or sea freight — all with real-time tracking
• Full shipment visibility from warehouse to destination port or facility
• Minimum order quantity: 1 piece — designed for urgent field repairs and small-batch rebuilds

Get Your Cylinder Liner Sleeve Now

Your engine isn’t generating revenue while it’s down. Send us your machine model (e.g., QSB6.7 CM2250), required quantity, and destination — we’ll issue a competitive quote within 24 hours. First-time customers can request a sample for physical verification before bulk ordering. Stock availability means you get the right Cummins ISB liner sleeve fast — no waiting weeks for OEM backorders.

Frequently Asked Questions