Complete Cylinder Head Kit - Peugeot 405 (CNG)

• Origin: Premier Aluminum Cylinder Head Manufactured in Turkey (ÖZGAYD Joint Venture)
• Alloy Properties: Advanced Anti-Warping Alloy Resistant to High-Temperature CNG Combustion and Coolant Erosion
• Thermal Dynamics: Enhanced Thermal Conductivity Coefficient for Rapid Dissipation
• Heat Treatment: Deep T6 Thermal Hardening Achieving 110 Brinell (HB) Hardness
• Valve Guides: Factory-Installed Full-Brass Guides with 210 Brinell (HB) Hardness
• Valve Seats: CNG Corrosion-Resistant OE-Spec Valve Seats with Optimized Seating Angles
• Pressure Testing: 100% Factory Tested for Deep Cracks and Pressure Leakage at 8 Atmospheres
• Serviceability: Extended Decking Capability and Optimized Valve Shim Adjustment Range
• Certifications: European Quality Approved under License and Supervision of DAkkS GERMANY

Engineered by KIEK AUTO PARTS to mitigate chronic cylinder head vulnerabilities, extend engine service life, and minimize vehicle maintenance costs, this cylinder head utilizes a specialized aluminum alloy optimized for thermal endurance and resistance to both high-temperature CNG corrosion and coolant erosion. Featuring an elevated thermal conductivity coefficient, this design facilitates rapid heat dissipation, dramatically lowering the risk of cylinder head warping during severe engine overheating. Furthermore, a deep T6 heat treatment enhances structural integrity, enabling an increased number of resurfacing (decking) cycles over time.

Designed for effortless seating, lapping, and precise valve shim adjustment, this product optimizes shop installation workflows for automotive specialists. Produced in Turkey through a technical collaboration between KIEK and ÖZGAYD, and certified under the quality control supervision of DAkkS GERMANY, this cylinder head delivers original equipment (OE) quality for high-reliability repairs.

Main Functions of the Cylinder Head:

• Combustion Chamber Sealing: Forms the upper wall of the combustion chamber alongside the engine block, maintaining high-pressure containment during combustion.
• Thermal Management & Cooling: Directly absorbs combustion heat and transfers thermal loads into the cooling system to preserve operational stability.
• Gas Flow Regulation: Houses intake and exhaust valves, maintaining synchronized airflow and exhaust gas scavenging.
• Valvetrain & Structural Protection: Provides a rigid housing for vital components including the camshaft, valves, valve guides, and spark plugs.
• Fluid Integrity Maintenance: Interfaces with the cylinder head gasket to form a pressure-tight seal, preventing cross-contamination between oil, coolant, and combustion gases.

Supplementary Documentation: Guide & Maintenance

Adhering to the following protocols ensures maximum performance, durability, and safety for the KIEK AUTO PARTS cylinder head assembly:

1. Initial Installation Guidelines:

• Thoroughly clean all mating surfaces (cylinder head and block deck) with an approved solvent to remove residue or foreign particles.
• Position an original cylinder head gasket onto the engine block according to manufacturer alignment specifications.
• Lower the cylinder head onto the gasket and torque bolts in a cross-pattern sequence to specified engineering stages (e.g., initial pass at 20–25 Nm, progressively increasing to a final specification of 90–100 Nm).
• Run the engine at idle to allow the gasket to seat, then re-check torque specifications as recommended.

2. Periodic Inspection & Maintenance:

• Every 10,000 km or 6 Months: Check for oil and coolant leaks along the cylinder head-to-block seam; inspect coolant clarity for oil contamination; verify deck flatness (maximum allowable deviation of 0.1–0.2 mm).
• Every 20,000 km: Perform a cylinder leak-down test up to 8 atm; inspect brass valve guides and seats for wear or erosion.

3. Consumable Component Replacement Schedule:

• Cylinder Head Gasket: Always replace with a new gasket whenever the head is removed.
• Shims & Gaskets: Replace after deck resurfacing exceeding 0.1 mm or upon detecting thermal distortion.
• Valve Guides & Seats: Replace every 40,000–50,000 km if excessive wear or CNG-induced erosion is detected.
• Spark Plugs & Fuel Injectors: Inspect and service every 30,000–40,000 km according to vehicle technical standards.

4. Servicing & Overhaul Guidelines:

• Disassembly: Disconnect all cooling lines, intake/exhaust manifolds, and carefully tag fasteners.
• Inspection: Conduct a Dye Penetrant Test (DPT) for micro-fractures; measure surface deck flatness using a feeler gauge (maximum warp tolerance: 0.05 mm; surface roughness $R_a \le 0.8\text{ }\mu\text{m}$).
• Resurfacing: Maximum resurfacing depth is limited to 0.2 mm to maintain structural deck integrity and compression ratio limits.
• Reassembly: Utilize approved OE-spec guides, seats, gaskets, and shims while strictly maintaining bolt torque sequences.

5. Storage & Transportation:

Store in a dry, foam-padded crate within a temperature range of 5–40°C and relative humidity below 60%. Protect the machined deck surface from mechanical impacts or heavy loads.