Multi-Layer Steel (MLS) Cylinder Head Gasket with 89.5mm Bore Diameter and 1.025mm Compressed Thickness for Nissan YD25DDTi MR20DE

The cylinder head gasket carrying Nissan OEM number 11044-5X05A (also formatted as 110445X05A) is a direct replacement for factory sealing components across a wide range of Nissan passenger and commercial vehicles. This gasket is installed between the cylinder head and engine block, forming a secure seal that endures the extreme pressures and thermal expansions of modern internal combustion engines.

This gasket serves two distinct Nissan engine families: the YD25DDTi (YD25) 2.5L inline-4 turbo-diesel found in Nissan pickups and SUVs, and the MR20DE 2.0L inline-4 petrol engine found in Nissan's global passenger car lineup.

This gasket is constructed as a multi-layer steel (MLS) stack with an elastomer coating on the outer layers. MLS construction withstands the high cylinder pressures of turbo-diesel operation while accommodating different thermal expansion rates between aluminum cylinder heads and engine blocks.

Key technical specifications:

• Diameter: 89.5 mm
• Compressed thickness: 1.025 mm (approximately 0.040 inches)
• 5-notch thickness identification system
• Stainless steel fire rings for 89.5 mm bore

This Nissan cylinder head gasket 11044-5X05A directly replaces factory sealing components in the following vehicle and engine configurations:

• Multi-Layer Steel (MLS) Construction: Withstands high cylinder pressures and thermal cycling
• Stainless Steel Fire Rings: Create gas-tight seal around combustion chamber, resistant to temperatures up to 800°C
• Elastomer Coating: Seals coolant and oil passages by flowing into microscopic surface imperfections
• 5-Notch Thickness: Ensures factory compression ratio and piston-to-valve clearance
• Dual Engine Compatibility: Single part number serves both YD25DDTi and MR20DE engines
• IATF 16949 / ISO 9001 Certified: Manufactured under automotive industry's highest quality standards

Critical installation notes:

• Always replace cylinder head bolts with new genuine-spec bolts
• Confirm notch code match for proper thickness (1.025 mm)
• Check cylinder head and block surfaces for warpage
• Clean and chase all bolt holes before installation
• Use correct coolant type for each engine family
• Perform full cooling system bleed after replacement

• Individual packaging: Sealed in anti-static VCI bag, foam-lined carton
• Carton dimensions: Approximately 25 × 20 × 2 cm (10 × 8 × 0.8 in)
• Gasket weight: Approximately 0.4 kg
• Lead time: 3-7 working days for stock orders
• Minimum order quantity: 1 piece (sample order available)