CAT 8F-8523 2.75\ Inner Diameter Sleeve Bearing

CAT 8F-8523 is a Caterpillar camshaft bearing (also commonly known as a camshaft bushing), adapted for the camshaft support components of many Caterpillar diesel engines. It is used to reduce friction during camshaft rotation, provide positioning, and withstand radial loads. The following is raw data and does not include replacement parts information.

Core Technical Parameters (Raw Data)

Item Details
Basic Attributes Model 8F-8523, Type: Camshaft Bearing, Material: Three-layer alloy (steel back + copper-lead alloy layer + Babbitt alloy surface layer), Single Weight: 0.271 kg (0.6 lbs), Operating Temperature: -30℃ to +180℃, Suitable Shaft Diameter: 50 mm, Fit Tolerance: H7, Corrosion Resistance: ≥120 hours salt spray, Hardness: Babbitt alloy layer HB 20-30, Steel back hardness HB 180-220, Elastic Modulus: 210 GPa, Coefficient of Thermal Expansion: 11.5×10^-6/℃, Fit Clearance: 0.02-0.05 mm

Key Dimensions (Metric / Imperial): Inner Diameter: 50 mm (1.969 in), Outer Diameter: 60 mm (2.362 in), Length: 32 mm (1.260 in), Wall Thickness: 5 mm, Number of Oil Grooves: 2 Oil groove width 3 mm, oil groove depth 0.5 mm, inner diameter tolerance +0.010/-0.005 mm, outer diameter tolerance +0.015/-0.008 mm, length tolerance +0.10/-0.05 mm, roundness ≤0.01 mm, surface roughness Ra≤0.4 μm

Performance Parameters: Radial load capacity ≥80 kN, fatigue limit ≥350 MPa (10^7 cycles), coefficient of friction ≤0.005 (lubricated state), compressive strength ≥250 MPa, assembly interference 0.01-0.02 mm, maximum applicable speed 3500 rpm, oil film thickness ≥0.005 mm

Structure and Adaptability Characteristics: Three-layer alloy structure: steel backing provides support strength, copper-lead alloy layer enhances load-bearing capacity and thermal conductivity, Babbitt alloy surface layer reduces friction and wear, suitable for the high-frequency reciprocating and radial load conditions of engine camshafts, effectively absorbing vibration and reducing wear risk.

Oil Groove Design: The bearing’s inner surface features two axial oil grooves to store lubricating oil, forming a stable oil film for sufficient lubrication. This design is suitable for intermittent oil supply and high-speed engine operation, extending service life.

Compatibility: Compatible with the camshaft support of Caterpillar 3306, 3406, and other series diesel engines. It is precisely positioned within the camshaft bore in the cylinder block, suitable for heavy-duty, high-speed engine operation. Installation requires cold-press assembly; impact is prohibited.

Compatible Engines and Applications:

Engines: Caterpillar 3306, 3406, 3408, and other series diesel engines. Used for radial support and positioning of the camshaft. Suitable for engines in construction machinery (excavators, loaders), generator sets, marine power systems, etc., ensuring stable camshaft operation and improving power output efficiency.

Others: Compatible with the camshaft components of some Caterpillar industrial diesel engines, suitable for continuous operation and frequent start-stop conditions, and meets the power system requirements of engines under harsh operating conditions.

Installation and Maintenance Points (Original Data)

Installation: Clean the bearings and cylinder block camshaft bores, ensuring they are free of oil stains and metal shavings. Inspect the bearings for cracks and alloy layer peeling, and confirm that the dimensions meet requirements.

Cold press installation (pressing force ≤ 60 kN), ensuring an interference fit (interference 0.01-0.02 mm). After installation, the coaxiality should be ≤ 0.015 mm, and the installation direction must be aligned with the oil passage hole.

After installation, check the inner diameter and roundness. Inject clean lubricating oil, perform a cranking test (no jamming, abnormal noise, or normal oil pressure).

Maintenance: Check bearing wear and alloy layer condition every 2000 hours. Replace immediately if wear exceeds 0.15 mm or alloy layer peeling occurs.

Regularly check engine lubricating oil quality and pressure to prevent bearing burnout due to poor lubrication. Use a dedicated puller during disassembly; do not pry hard and damage the cylinder block bores and bearings.