CAT 6T-5747 Drive Axle Sleeve

The CAT 6T-5747 is a Caterpillar engine valve spring retainer sleeve, used in the valve train of medium and heavy-duty diesel engines. It guides and positions the valve spring seats, suppresses lateral spring offset, eliminates vibration and noise, and ensures precise valve opening and closing and stable power output. It is compatible with the valve assembly system of engines such as the 3406E/C15. The following is the core information:

Core Technical Parameters
Item Details
Part Model: CAT 6T-5747 (6T5747) Valve Spring Seat Sleeve, compatible with engine valve assemblies with a valve stem diameter of 12mm, providing guidance and positioning for the spring seat.

Material: Sleeve body: 42CrMo alloy steel, tempered to HRC30-35, surface anodized for corrosion resistance; Inner bore: precision honed Ra≤0.8μm, compatible with valve stem sliding; End face: nitrided to HRC45-50, wear-resistant and impact-resistant.

Key Dimensions: Outer diameter 35mm, inner diameter 12.5mm, length 42mm, step height 5mm, wall thickness 11.25mm, compatible with valve spring seats with an inner diameter of 35mm and a valve stem diameter of 12mm, single weight approximately 0.21kg.

Compatible Engines: CAT 3406E, C15, C18 engines, D8R Suitable for medium and heavy-duty equipment such as bulldozers, 980G loaders, and 777 mining trucks, this system is compatible with the intake and exhaust valve spring seat installation of 12-cylinder/6-cylinder engines.

Performance Parameters: Operating temperature -40℃ to 300℃, radial runout ≤0.05mm, sliding clearance 0.05-0.10mm, fatigue strength ≥800MPa, suitable for valve train conditions with valve lift ≤15mm.

Core Functions and Structural Features:

Guiding and Positioning: The inner bore precisely matches the valve stem, limiting radial offset of the spring seat, ensuring accurate valve movement trajectory, preventing uneven wear between the valve and valve seat, and extending the life of the seals.

Vibration and Noise Reduction: The stepped structure fits the end face of the spring seat, absorbing the vibration energy of the valve spring, reducing valve train noise, and suitable for high-speed (≤2200rpm) engine operation.

Wear-resistant and durable: Made of alloy steel with nitriding treatment, suitable for the high-temperature environment of the valve chamber, it shows no deformation or wear even after long-term use, ensuring valve opening and closing synchronization and maintaining stable power output.

Precise installation: The outer diameter and the inner diameter of the spring seat are interference-fitted (interference 0.02-0.05mm), ensuring no looseness after installation, guaranteeing the coaxiality of the spring seat, and reducing the risk of valve stem bending.

Installation and maintenance points:
Installation specifications: Clean the valve stem, spring seat, and sleeve inner bore to remove oil, carbon deposits, and burrs, ensuring the surface is free of scratches and rust.

Cool the sleeve to -196℃ with liquid nitrogen and then quickly press it into the spring seat, or use a special press to press it in with a pressure of 5-8kN, ensuring a proper interference fit and avoiding damage to the sleeve and spring seat.

After installation, check the smooth sliding of the sleeve and valve stem to ensure there is no jamming, no tilting after valve spring compression, and radial runout of the valve stem ≤0.05mm.

Maintenance Recommendations:

Inspect the valve sleeve for wear every 10,000 operating hours or during a major overhaul. Replace it when the inner bore wear is ≥0.2mm to prevent abnormal valve movement that could lead to reduced power and increased fuel consumption.

Simultaneously check the valve spring’s elasticity and fatigue condition. Replace the valve spring along with the sleeve when the free length shortens by ≥2mm or the elasticity decreases by ≥10% to ensure the performance of the valve train.