119-3061: 30.82mm Outer Diameter Injector Sleeve

CAT 119-3061 is a Caterpillar hardened brass injector sleeve, compatible with 3114/3116/3126 engines. It has an outer diameter of 30.82mm and is used for sealing, heat conduction, and positioning between the cylinder head and the injector. Key information is as follows:

Key Parameters
Item Details
Type: Hardened brass injector sleeve, compatible with mechanical injection (MUI) systems, used to isolate the injector from the cylinder head, preventing fuel leakage and combustion gas intrusion, and also provides heat conduction and positioning functions.
Dimensions (Metric/Imperial): Outer diameter 30.82mm (1.213 inches), inner diameter approx. 22.23mm (0.875 inches), length approx. 63.50mm (2.5 inches), adapts to corresponding cylinder head mounting holes and injector outer diameter.
Material: High-purity hardened brass, copper content ≥95%, with trace amounts of tin/lead added to improve machinability and sealing performance. The surface is hardened to a high hardness. HB120-150, deformation-resistant and corrosion-resistant, suitable for high-temperature and high-pressure engine conditions.

Structure: Thin-walled cylindrical shape with a positioning shoulder at the top and a sealing chamfer at the bottom. After installation, it has an interference fit with the cylinder head and, together with a copper washer, achieves a double seal to prevent fuel leakage and gas ingress.

Accuracy: Outer diameter tolerance ±0.01mm, inner diameter tolerance ±0.015mm, length tolerance ±0.10mm, ensuring assembly accuracy and sealing reliability with the injector and cylinder head.

Suitable for: Cat 3114, 3116, and 3126 engines, commonly found in 320B/322C/325L excavators, 773 mining dump trucks, CB series road rollers, etc.

Used for replacing seals during engine overhauls or injector replacements to prevent fuel leakage and gas ingress caused by sleeve aging or deformation, avoiding engine power loss, increased fuel consumption, and starting difficulties.

Performance Characteristics
Constructed of hardened brass, it boasts excellent thermal conductivity, rapidly dissipating heat from the injector head, reducing injector operating temperature, and extending injector lifespan.

The thin-walled interference fit design ensures a tight fit with the cylinder head after installation, achieving a double seal with the copper gasket, improving sealing reliability by approximately 40% compared to ordinary carbon steel sleeves.

Compatible with mechanical injection systems, compatible with Cat original injectors and some replacement injectors. Easy installation, no special tools required (recommended to use the 143-2099-MUI-R removal kit).

Replacement Models
Direct replacements: 7W-5749, 101-3254, interchangeable, suitable for the same engine and installation conditions.