CAT 4T-4533 14.20mm Thick Control Valve Spacer

CAT 4T-4533 is a Caterpillar engine valve adjusting shim (precision steel adjusting shim) used for precise adjustment of valve clearance in engine valve mechanisms. It is suitable for medium and heavy-duty engines, ensuring accurate valve timing, reliable valve sealing, and reducing abnormal wear and power loss. Cat®… The following is the core information:

Core Technical Parameters
Item Details
Part Model CAT 4T-4533 (4T4533) Valve Adjusting Shim, Precision Steel Shim, used for adjusting the clearance between engine valve tappets/rocker arms and valve stems, suitable for valve stem diameters of 8-10mm
Material 50CrV4 spring steel, quenched and tempered (HRC42-48), surface nitrided, uniform hardness, strong wear resistance, thickness tolerance ±0.005mm, suitable for high temperature and high pressure conditions

Key Dimensions Outer diameter 22mm, inner diameter 10mm, thickness 2.0mm, suitable for valve tappet diameter 22mm, mounting groove depth 2.02-2.05mm, ensuring clearance adjustment accuracy ≤0.01mm

Compatible Engines CAT C15/C18/C32 engines, 3406E/3408E series engines, suitable for valve clearance 0.25-0.35mm (cold state), suitable for operating conditions with speeds ≤2200rpm.

Performance Parameters: Operating temperature -40℃ to 300℃, compressive strength ≥1200MPa, elastic deformation ≤0.01mm, reusable ≤3 times to avoid deformation affecting clearance accuracy.

Core Functions and Structural Features:

Precise Clearance Adjustment: Precision steel shims, by changing different thicknesses, precisely control valve clearance, ensuring accurate valve timing, improving engine power output and fuel economy, and reducing valve knocking noise.

Wear-Resistant and Deformation-Resistant: High-quality spring steel + nitriding treatment, suitable for the high-temperature and high-pressure environment of engines, not easily deformed over long-term use, ensuring stable clearance, reducing abnormal wear of valves and valve seats, and extending the life of the valve system.

Strong Adaptability: Standard size adapts to specific engine valve mechanisms, after installation, it fits tightly with the valve tappet/rocker arm without looseness or jamming, ensuring smooth valve movement.

Easy Installation: Precise dimensions allow for direct replacement without additional machining, quickly adjusting valve clearance and reducing engine maintenance time and costs.

Installation and Maintenance Points
Installation Specifications: Remove the valve cover while the engine is cold. Rotate the crankshaft to top dead center of the compression stroke and measure the valve clearance. Select a 4T-4533 shim of the appropriate thickness based on the measurement and install it on top of the valve tappet, ensuring the shim is flat and not tilted.

After installation, measure the valve clearance again and adjust it to the standard range (0.25-0.35mm when cold). Tighten the valve cover bolts to a torque of 25-30 N·m to prevent oil leaks.

Maintenance Recommendations: Check the valve clearance every 2000 operating hours. Replace the shim promptly if it exceeds the standard range to avoid problems such as poor valve sealing, reduced power, and increased fuel consumption.

When replacing the shim, clean the contact surfaces of the valve tappet and rocker arm. Check the shim for scratches and deformation, ensuring a tight fit and precise clearance after installation.