Volvo loader L90 and L120 stock cylinder head , Iran

Part number, Dimensions and technical information of volvo loader cylinder head

The cylinder head for Volvo L90 and L120 wheel loaders is machined from high‑grade gray cast iron alloy with tensile strength exceeding 800 MPa and thermal fatigue resistance suitable for heavy‑duty diesel operation. Typical OEM part numbers for comparable Volvo cylinder heads are in the 20‑series range such as 20855301 for L90‑series engines, indicating compatibility with six‑cylinder TD6J engines in L90 and similar platforms. Head height deck to top is typically engineered within ±0.1 mm tolerance, with combustion chamber surface flatness below 0.02 mm to ensure proper sealing. Valve seat inserts and guides are hardened steel, supporting intake valve diameters approx. 34 mm and exhaust approx. 29 mm. Cooling jacket layout and bolt holes are CNC‑drilled for precise fit on the block flange to distribute load evenly and minimize distortion under thermal cycling.

For the Volvo L180 loader, a robust cylinder head part number such as 190505 is used on its larger diesel engine, often a six‑cylinder high‑displacement type. This head is cast from modified iron or steel alloy to endure higher peak cylinder pressures and greater heat rejection demands. Typical installed head mass is higher by 10‑20% compared to L90/L120 heads due to thicker webs and reinforcement ribs. Bore‑to‑bore spacing respects engine design geometry and maintains structural integrity under repeated combustion loads. OEM and aftermarket spare catalogs list 6‑cylinder head assemblies with standardized mounting bolt patterns and water/oil passage interfaces for certified rebuild or replacement. Surface finish in the combustion zone is controlled to Ra values below 1.6 μm to enhance gasket sealing and longevity.

Volvo loader Stock cylinder head L90, L120 and L180

When comparing the quality and durability of a stock cylinder head versus a brand-new unreconditioned cylinder head for Volvo L90 and L120 loaders, the new head clearly has superior material quality. It is manufactured from OEM-standard cast iron or steel alloy with strictly controlled chemical composition. Durability under full operational conditions is predicted to exceed 8,000 engine hours for a new head, whereas a used stock head typically lasts between 3,000 and 6,000 hours depending on prior usage. CNC tolerances and surface finish of new heads are usually below 0.02 mm, reducing the risk of thermal fatigue or cracking under heavy loads.

In terms of cost, a brand-new cylinder head is generally 30–70% more expensive than a stock head due to guaranteed quality, pressure testing, and absence of prior wear or micro-cracks. While a stock head can be a more economical option, it requires thorough inspection for cracks, warping, and corrosion to minimize the risk of early failure. For high-load operations, a new head offers lower total cost of ownership because of longer service intervals and reduced unexpected downtime, making it more suitable for long-term projects.