Head To Cover Gasket 8-97105690-3 8971056903 For ISUZU NPR66 XD 4HF1 Diesel Engine

The Head To Cover Gasket (OEM Numbers: 8-97105690-3 / 8971056903) is a premium-quality, direct replacement engine sealing component designed specifically for ISUZU NPR66 and XD series trucks equipped with 4HF1 diesel engines.

This precision-engineered gasket creates a reliable, leak-free seal between the cylinder head and cover, preventing oil leakage while blocking dust, moisture, and contaminants from entering the cylinder head area.

• OE Quality: Manufactured to strict ISUZU dimensional and material specifications for perfect fit and function
• High-Quality Sealing Material: Oil-resistant composite fiber or rubber-coated metal resists hot oil, heat, and vibration
• Precision Die-Cut: Exact dimensions ensure correct fitment around all bolt holes and cover contours
• Leak-Proof Performance: Prevents oil seepage from the cylinder head cover joint
• Restores Engine Cleanliness: Eliminates oil accumulation on the engine and surrounding components
• Direct Replacement: Matches OE gasket dimensions and sealing configuration
• Long Service Life: Engineered for commercial diesel engine applications
• Cost-Effective Repair: Affordable replacement that prevents oil loss and engine contamination

This head to cover gasket is specifically designed for ISUZU medium-duty trucks and commercial vehicles:

• ISUZU NPR66 (Medium-Duty Trucks)
• ISUZU XD (Medium-Duty Trucks)
• ISUZU 4HF1 Engine Specifications:
  • 4-Cylinder, Inline Diesel
  • Displacement: 4.3L
  • Valvetrain: OHV
  • Application: Medium-duty trucks and commercial vehicles

Also compatible with various ISUZU models using the 4HF1 engine with the same cylinder head cover configuration.

1. Ensure engine is cool - Allow the engine to cool completely before disassembly
2. Disconnect battery - Always disconnect the negative terminal before working
3. Remove the cover - Unbolt and remove the cylinder head cover (valve cover) to access the old gasket
4. Remove the old gasket - Carefully peel off the old gasket; note its orientation
5. Clean all mating surfaces - Thoroughly clean the cylinder head and cover surfaces; remove all old gasket material, oil, and debris
6. Inspect surfaces - Check for warpage, cracks, or damage on both mating surfaces; repair or replace if necessary
7. Install the new gasket - Position the new head to cover gasket on the cylinder head; ensure proper alignment with bolt holes
8. Reinstall the cover - Carefully place the cover over the gasket; hand-start all bolts
9. Torque bolts - Tighten bolts in a criss-cross pattern to manufacturer torque specifications. Do not over-tighten
10. Check for leaks - Start the engine and inspect the cover joint for oil leakage
11. Road test - Test drive to verify proper sealing and no oil leaks

• Material Verification: Confirms gasket material meets ISUZU oil resistance, temperature, and durability specifications
• Dimensional Inspection: Gasket dimensions, bolt hole locations, and port openings verified within OEM tolerances
• Fit Testing: Sample assembled to ensure proper fit and sealing
• Visual Inspection: 100% checked for defects, cuts, or manufacturing flaws
• Packaged Safely: Protected and packaged to prevent damage during transit

• Neutral export packing or customized packaging available
• Carton or wooden case for safe transportation
• Fast delivery for stock items
• Shipping by Express Air or Sea