CAT 4P-1665 Turbo Outlet Sleeve

The CAT 4P-1665 is a Caterpillar exhaust outlet sleeve, commonly used in the turbocharger exhaust systems of backhoe loaders such as the 416B/C and 426C, as well as the AP-800C paver. Its core function is to connect the turbocharger exhaust port to the exhaust pipe, while also providing positioning, heat insulation, and sealing functions. It is suitable for low-to-medium speed and high-temperature operating conditions and is a key transitional component of the exhaust system. The following is structured technical and application information:

Core Technical Parameters

Item Details
Basic Attributes
Model 4P-1665, Type: Exhaust outlet sleeve, Material: Heat-resistant alloy cast iron (HT250, surface ceramic coating), Single weight: Approximately 0.37 kg, Applicable temperature: -20℃ to +600℃, Sealing type: Metal gasket seal, Connection method: Flange butt joint, Compatible turbocharger model 6I-4195, etc., Rated working pressure: 0.3 MPa, Applicable medium: High-temperature exhaust gas

Key Dimensions
Outer diameter: 80 mm (tolerance ±0.20 mm), Inner diameter: 60 mm (tolerance ±0.15 mm), Total length: 45 mm (tolerance ±0.20 mm), Flange diameter: 100 mm (tolerance ±0.20 mm), Flange thickness: 8 mm (tolerance ±0.10 mm), Number of bolt holes: 4, Bolt hole distribution circle diameter: 85 mm (tolerance ±0.15 mm), Bolt hole diameter: 11 mm mm (tolerance + 0.10 mm), chamfer 3 mm × 45°
Compatible Models and Applications: Compatible with Cat 416B, 416C, 426C, 428B/C, 436C, 438C backhoe loaders, AP-800C, BG-230 asphalt pavers, PF-300B road rollers. Used for connecting the turbocharger exhaust outlet and exhaust pipe. Matching parts include metal gaskets, M10 × 1.5 bolts, and washers. Suitable for exhaust temperatures ≤ 600℃.
Performance Parameters: Heat resistance temperature 600℃, vibration fatigue resistance ≥ 10⁶ cycles, sealing pressure 0.3 MPa, coaxiality after assembly ≤ 0.15 mm, flange flatness ≤ 0.10 mm, bolt torque 45 N・m, service life ≥ 3000 km. Hourly
Structural and Performance Advantages
Heat-Resistant Sealing: The alloy cast iron material with a ceramic coating provides excellent high-temperature resistance. The metal gasket sealing design effectively prevents high-temperature exhaust gas leakage, suitable for the high-temperature and high-pressure conditions of turbocharger exhaust ports.

Precise Positioning: The flange structure and precisely distributed bolt holes ensure coaxial connection between the sleeve and the turbocharger and exhaust pipes, avoiding exhaust airflow turbulence and localized wear, ensuring stable operation of the exhaust system.

Easy Installation: The integrated flange design allows for direct bolt fixing, facilitating quick on-site replacement, reducing equipment downtime and maintenance costs.

High Durability: The alloy cast iron material has strong resistance to thermal deformation, extending the lifespan of the sleeve by approximately 1.5 times compared to ordinary cast iron sleeves, suitable for frequent start-stop and vibration conditions.

Installation and Maintenance Points: Before installation, clean the sleeve, turbocharger exhaust port, and exhaust pipe flange surface. Inspect the sleeve for cracks, deformation, and coating peeling. During assembly, apply high-temperature resistant sealant (Cat High-Temp Sealant recommended) to the metal gasket surface and tighten the bolts evenly (torque 45 N·m) to ensure a tight seal and no exhaust gas leakage.

Every 1000 hours of maintenance, check the sleeve bolts for looseness and the gasket for damage. Replace the sleeve immediately if cracks, deformation, or coating peeling are found to prevent exhaust gas leakage and potential safety hazards.

Prioritize original equipment manufacturer (OEM) parts or aftermarket parts conforming to OEM standards to ensure dimensional accuracy and heat resistance. Inferior sleeves may cause seal failure due to insufficient material or machining precision, leading to turbocharger damage.