Description
CAT 7N-9070 SPACER
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The CAT 7N-9070 is a Caterpillar genuine steel adjusting shim for engines (fitted for use between the valve cover, cylinder head, and cylinder block of Cat 3306/3406 series engines; used to adjust component clearances and provide leak-proof sealing; suitable for high-temperature and high-pressure operating conditions). The following is pure original data and does not include replacement parts information.
Core Technical Parameters (Raw Data)
Item Details
Basic Attributes
Model: 7N-9070, Type: Steel flat gasket (uncoated), Material: Low carbon steel (Q235), Single weight: 0.08 kg, Operating temperature: -40℃ to +200℃, Suitable for engine oil, diesel, coolant, etc., Oil resistance (nitrile rubber compatible), Strong chemical corrosion resistance, Sealing pressure ≤1.5 MPa, Compression ratio ≤5%, Rebound rate ≥15%, Service life ≥8000 hours
Key Dimensions
Outer diameter: 125 mm (4.921 in), Inner diameter: 85 mm (3.346 in), Thickness: 0.8 mm (0.0315 in), Edge chamfer: 0.5 mm × 45°, Inner diameter tolerance: +0.10/-0 mm, Outer diameter tolerance: +0/-0.10 mm, Thickness tolerance: ±0.02 mm, Surface roughness: Ra 0.8 μm, Flatness: ≤0.05 mm, hardness HB 120-150, no mounting holes (ring gasket)
Compatible Models and Parts: Compatible with Cat 3306B/3306C/3406B/3406C engine valve cover bottom seal (1 piece per cover), cylinder head and exhaust manifold connection clearance adjustment (2 pieces per side), used to seal and prevent oil leakage, adjust component installation clearance, and ensure normal engine operation.
Performance Parameters: Sealing surface contact pressure ≥2 MPa, metal surface fit ≥95%, temperature resistance (no deformation after continuous operation at 200℃), aging resistance ≥5000 hours (normal operating conditions), tensile strength ≥370 MPa, elongation ≥25%, asbestos-free, meets environmental standards.
Structural and Performance Advantages: Low carbon steel material: high strength and good toughness, suitable for high temperature and high pressure conditions of engines, prevents gasket deformation and cracking, and ensures sealing effect.
Precise Thickness Tolerance: A thickness accuracy of ±0.02 mm ensures precise adjustment of component gaps, preventing poor sealing in areas such as the valve cover and exhaust manifold.
Annular Hole-Free Design: Adapts to annular sealing surfaces, facilitating easy installation without additional fasteners, reducing installation difficulty and time costs.
Installation and Maintenance Points (Original Data)
Installation: Clean the sealing surfaces (free of oil and impurities). The gasket has no front or back; place it directly between the sealing surfaces. Install the bolts according to the engine manual (e.g., 25-30 N·m for 3306 series valve cover bolts). After installation, the surface gap should be ≤0.03 mm. Do not use sealant (the gasket has a built-in sealing function).
Maintenance: Check the gasket’s sealing condition every 2000 hours. Replace it if deformation, cracks, or aging are observed. Replace the gasket during engine overhaul; do not reuse.
Troubleshooting: Oil leakage is often caused by aging gaskets or insufficient installation torque. The gaskets need to be replaced and tightened to the standard torque. Abnormal gaps are often caused by incorrect gasket thickness selection. The model and thickness need to be checked.
