6211-22-2220 Cylinder Liner – Premium Replacement for Komatsu 6D140 Engine

For operators of Komatsu 6D140 engines – whether in bulldozers, excavators, wheel loaders, or other heavy construction equipment – the cylinder liner is a critical component that directly affects engine longevity, oil consumption, and overall reliability. The 6211-22-2220 cylinder liner is a premium, OEM-grade replacement engineered specifically for the 6D140 platform, delivering exceptional wear resistance, precise dimensional accuracy, and a direct drop-in fit.

As a wet-type cylinder liner, this component is designed to withstand the extreme mechanical and thermal stresses of heavy-duty construction applications. In this comprehensive guide, we examine its advanced construction, compatible engine variants, common failure signs, professional installation best practices, and why Rsolid Engine Parts is the preferred global supplier for Komatsu engine components.

1. Structural Features & Advantages of the 6211-22-2220 Cylinder Liner

The 6211-22-2220 is a precision-engineered wet-type cylinder liner, manufactured using high-grade alloy cast iron and advanced surface treatment processes. Its design incorporates several heavy-duty features:

• High-grade alloy cast iron construction – Manufactured from a specialised chromium‑molybdenum (Cr‑Mo) alloy cast iron, this material offers outstanding resistance to adhesive wear (scuffing), abrasive wear, and thermal fatigue. The alloy chemistry is optimised to maintain hardness and dimensional stability at sustained operating temperatures up to 300°C on the inner bore surface, preventing "bore softening" and ensuring long-term performance.

• Induction-hardened and plateau-honed bore – The inner running surface is induction-hardened to achieve a uniform surface hardness of HRC 52-58, providing a durable wear layer that resists scoring from piston ring micro-movement under high cylinder pressures. The final finishing uses a multi-stage plateau honing process, producing a controlled cross-hatch pattern (30-45° included angle) with a surface roughness (Ra) of 0.15 – 0.30 µm. This optimises oil film retention, ensures rapid ring seating, and significantly reduces oil consumption throughout the liner's service life.

• Wet-type liner with precision O-ring grooves – The 6211-22-2220 is a wet liner, meaning its outer surface is in direct contact with engine coolant. It features accurately machined grooves at the lower sealing section, designed to accommodate high-temperature FKM (Viton®) O-rings. This design maintains a positive coolant seal, preventing oil emulsification (coolant ingress) and keeping combustion gases out of the cooling system.

• Anti-cavitation and corrosion protection – The water-jacket contact area receives a specialised anti-cavitation coating and chemical passivation treatment, resisting pitting and material erosion caused by coolant vibration (cavitation) and the corrosive effects of coolant contamination.

• Precision-ground top flange with controlled protrusion – The upper flange is ground to a mirror finish with micron-level flatness (typically ±0.02 mm), ensuring a perfect gas-tight seal against the cylinder head gasket. The liner protrusion (height above the block deck) is factory-set to 0.05 – 0.15 mm, guaranteeing correct head gasket compression and preventing combustion gas leakage.

• Direct drop-in fit – The 6211-22-2220 is dimensionally identical to the original Komatsu liner, requiring no block machining or custom modifications for installation.

Operational benefits for equipment owners and engineers:

• Extended overhaul intervals – The induction-hardened bore and high-quality cast iron deliver up to 10,000 – 15,000 hours of reliable service.

• Reduced oil consumption – The plateau-honed finish optimises oil retention and ring seating, cutting oil top-up frequency.

• Consistent compression and thermal efficiency – A true, undistorted bore maintains maximum cylinder sealing, translating to better fuel economy and easier starting.

• 100% direct drop-in fit – Identical to the original Komatsu liner in all critical dimensions – no modifications required.

2. Compatible Engine Models & Typical Applications

The 6211-22-2220 cylinder liner is specifically engineered for the Komatsu 6D140 engine – a 6-cylinder, inline, 4-stroke, water-cooled diesel engine widely used in heavy construction and industrial equipment.

Engine Specifications (6D140 series):

• Cylinder configuration: 6 in-line

• Method of operation: 4-cycle, water-cooled, direct injection

• Bore x stroke: OEM standard – verify with engine manual

• Typical power output: 140–200+ HP (depending on variant)

Critical cross-reference: The 6211-22-2220 is a genuine Komatsu service part number for standard-size cylinder liners in the 6D140 series. Oversize liners (+0.25mm, +0.50mm) may be available – confirm your current bore measurement and engine serial number before ordering. This liner is typically supplied as a bare unit; O-ring seals and head gaskets are ordered separately or as part of a complete overhaul kit.

3. Common Failure Modes & Installation/Replacement Recommendations

Typical Warning Signs Your Liner Needs Replacement

• Excessive oil consumption with blue exhaust – Continuous blue smoke at operating temperature indicates bore glazing, excessive wear, or deep vertical scoring.

• High blow-by and crankcase pressurisation – Oil mist pulsing from the dipstick tube or breather due to worn bore ovality or deep scuff marks.

• Unexplained coolant loss – Dropping coolant levels without visible external leaks often points to a failed lower O-ring seal or a cracked liner.

• Combustion gas in the cooling system – Persistent bubbles in the radiator or expansion tank indicate a cracked liner or failed upper seal.

• Loss of compression / hard starting – Worn or scored liners reduce cylinder sealing, leading to difficult starts and reduced power.

Professional Installation Best Practices

Precision installation is crucial to realising the full service life of the 6211-22-2220 liner. Follow these essential steps:

1. Thorough cleaning of the cylinder block bore – Remove the old liner and meticulously clean the liner seat in the block using a suitable solvent and a non-abrasive nylon pad. Remove all old O-ring residue, carbon deposits, and surface rust. The seat must be perfectly clean, dry, and free from any foreign particles.

2. Inspect and measure the block housing – Using a dial bore gauge, measure the block's liner housing for ovality and out-of-round. Ensure it remains within service limits (typically less than 0.03 mm total variation).

3. Lubricate and fit new O-rings – Lightly coat the new FKM (Viton®) O-rings with clean engine oil or a specialised rubber assembly lubricant. Never use silicone grease or petroleum jelly, as these can cause the O-rings to roll or extrude.

4. Install the liner with controlled, even pressure – Using a dedicated liner installation tool or a hydraulic press, insert the liner squarely into the block bore. Never strike the liner flange directly with a hammer, as this will distort the honed bore.

5. Measure liner protrusion – After seating, measure the liner's height above the block deck at three to four points using a dial gauge. The protrusion must be consistent (typically 0.05 – 0.15 mm) and within the engine manual's specified range.

6. Final bore verification – Re-check the bore for roundness and taper to ensure no distortion occurred during the fitting process.

7. Assemble piston and rings – Fit the piston rings using a proper ring expander, stagger the ring gaps at 120° intervals, and thoroughly lubricate the piston, rings, and fresh liner bore with clean engine oil.

8. Torque the cylinder head – Follow Komatsu's factory torque sequence and specifications. Re-torque after the initial heat cycle and again after 50 operating hours.

9. Break-in procedure – Start the engine and run at low idle (no load) for 15-20 minutes. Gradually apply load over the next 8-10 hours. Change the engine oil and filter after the initial break-in period.

4. Why Rsolid Engine Parts Is Your Preferred Global Supplier

Rsolid Engine Parts has been a trusted supplier of Komatsu, Mitsubishi, Yanmar, and Caterpillar diesel components for over 15 years, serving construction fleets, power plants, and workshops across six continents. Here is why the 6211-22-2220 cylinder liner from Rsolid is the intelligent choice:

• OEM-equivalent manufacturing – Produced in ISO 9001:2015 and IATF 16949 certified foundries, using identical chromium‑molybdenum alloy chemistry and induction-hardening processes as genuine Komatsu service parts.

• 100% precision quality inspection – Every liner is inspected for bore roundness, straightness, surface finish (Ra value), hardness (HRC), and flange dimensions using state-of-the-art CMM equipment.

• Complete complementary seal kits – We supply matching high-temperature FKM (Viton®) O-rings and full seal kits, ensuring you have everything required for a leak-free installation.

• Global stock & rapid logistics – Strategically warehoused in Asia, Europe, and North America, ensuring 3-7 working day delivery to major international ports and airports.

• Competitive wholesale pricing – Attractive volume discounts for workshops, fleet operators, and parts distributors.

• Free expert technical support – Our in-house engineers provide installation torque guides, liner protrusion measurement advice, and troubleshooting via WhatsApp or email.

• Solid warranty – 12 months / 2,000 operating hours against casting defects, premature wear, and material failures.

Contact Rsolid Engine Parts Today

📧 Email: amy@rinjector.com
📱 WhatsApp: +86 15975376778

Whether you need a single 6211-22-2220 cylinder liner for a running repair or a full set of six liners for a complete Komatsu 6D140 overhaul, Amy and her dedicated team will provide a detailed quotation, stock availability, and shipping schedule within 2 hours. We also supply complementary parts – piston assemblies, ring kits, connecting rod bearings, complete O-ring kits, and full gasket sets – for comprehensive engine rebuilds.

Choose the 6211-22-2220 cylinder liner from Rsolid – engineered for uncompromising durability, reduced oil consumption, and reliable power for your Komatsu 6D140 engine.