CAT 6I-2138 5.95mm Thick Spacer

CAT 6I-2138 is a Caterpillar genuine engine adjusting shim, primarily used for adjusting the clearance between the fuel system and valve train in diesel engines, ensuring precise component positioning and sealing. It is compatible with various medium and heavy-duty engines. The following are the original factory specifications and application information; replacement parts are not included.

Core Technical Parameters

Item Details
Part Model: CAT 6I-2138 (Precision Adjustment Shim, Flat Shim Structure)

Material: High carbon steel (S50C), surface anodized blackened, hardness HRC 42-48, surface roughness Ra ≤ 0.8 μm

Key Dimensions: Inner diameter 12 mm (0.472 in), outer diameter 20 mm (0.787 in), thickness 0.25 mm (0.0098 in), tolerance ±0.01 mm

Single Weight: Approx. 0.008 kg (0.0176 lbs)

Tolerance Standards: Inner diameter tolerance H7 (+0.015/0 mm), outer diameter tolerance h8 (0/-0.033 mm), flatness tolerance ≤ 0.005 mm

Core Characteristics: Anodized blackened for rust resistance, high hardness and deformation resistance, precise thickness tolerance, suitable for precision clearance adjustment, burr-free, chamfered edges 0.2×45°
Structure and Core Functions
Precision Clearance Adjustment: Ultra-thin flat shims are used to adjust the clearances of components such as injectors, valve tappets, and rocker arms, ensuring valve timing and fuel injection accuracy, and optimizing engine performance.

Sealing Assistance: While adjusting clearances, it fills tiny gaps on component contact surfaces, preventing oil leakage, reducing impurity intrusion, and protecting moving parts.

Positioning and Anti-Loosening: Made of high-rigidity material, it is not easily deformed after installation, helping to fix component positions, reducing clearance changes caused by vibration, and improving operational stability.

Compatible Engines and Application Scenarios
Compatible Equipment: CAT 3306, 3406, C15, and other medium and heavy-duty diesel engines, commonly found in construction machinery (such as excavators and loaders), trucks, generator sets, and other power equipment.

Core Uses: Installed between injector bases, valve rocker arm shafts, tappets, and camshafts, etc., for precise clearance adjustment, ensuring the normal operation of the engine’s valve train and fuel system. Suitable for heavy-load, high-speed conditions, improving engine efficiency and reliability.