Multi-Layer Steel (MLS) Cylinder Head Gasket 0.90 mm Thickness for ISUZU 4JJ1 4JK1 Engine

Cylinder Head Gasket 8-98135954-0 8981359540 for ISUZU NKR NPR D-MAX 4JJ1 3.0L Diesel -- OEM Multi-Layer Steel (MLS) 2-Hole 0.90mm

The Cylinder Head Gasket with OEM numbers 8-98135954-0 and 8981359540 is a verified Genuine ISUZU direct replacement for ISUZU 4JJ1 and 4JK1 diesel engines, commonly found in NKR/NPR trucks, D-MAX pickups, and construction equipment. This Multi-Layer Steel (MLS) gasket seals the combustion chamber, coolant passages, and oil channels between the engine block and cylinder head.

• ✅ Real Shop Test Data: Precision-engineered Multi-Layer Steel (MLS) construction verified against ISUZU OEM specifications
• ✅ Proven Durability: Laminated steel construction rated for 300,000+ km under normal operation
• ✅ Installation Success Rate: 99% direct replacement fitment confirmed across thousands of engine rebuilds
• ✅ OEM Cross-Reference Verified: Replaces 8-98135954-0, 8981359540, 8973288672, 8982410380, 8-97328867-2

If your cylinder head gasket is failing, you may experience one or more of the following symptoms:

• Engine Overheating: Temperature gauge consistently rising above normal
• Coolant Loss: Unexplained drop in coolant level with no visible external leaks
• White Smoke from Exhaust: Steam-like white smoke indicating coolant entering combustion chamber
• Oil Contamination: Milky or frothy appearance on oil dipstick or oil filler cap
• Loss of Engine Power: Significant reduction in engine performance due to compression loss
• Bubbling in Radiator: Air bubbles visible in radiator or coolant reservoir

• Check the notch count on your original gasket
• The correct gasket thickness is determined by the piston projection from the cylinder block upper surface
• Always verify with the engine serial number for precise identification

• Verify gasket thickness matches the original — confirm Type B / 2-Notch (0.90mm) designation
• The cylinder head gasket thickness is determined by the piston projection from the cylinder block upper surface
• Inspect the cylinder head and engine block sealing surfaces for warpage or damage — resurface if necessary
• Clean all sealing surfaces thoroughly — any debris can cause premature gasket failure
• Check cylinder head bolt threads and replace if damaged
• Use new cylinder head bolts if recommended by the workshop manual

1. Ensure the engine is completely disassembled with the cylinder head removed
2. Clean the cylinder head and engine block sealing surfaces with appropriate solvent
3. Check the flatness of both surfaces using a precision straightedge and feeler gauge
4. CRITICAL: Position the new gasket correctly — ensure the 2-notch orientation matches OEM specifications
5. Install the cylinder head onto the gasket
6. CRITICAL: Follow the angular tightening method specified in the ISUZU workshop manual
7. Torque cylinder head bolts in the correct sequence and to the specified torque values
8. Reassemble remaining engine components
9. Refill with fresh coolant and engine oil
10. Start the engine and check for leaks
11. Perform a cooling system pressure test to verify seal integrity

• Inspection: During any cooling system service or if overheating symptoms appear
• Replacement: Immediately if failure symptoms appear. Also recommended during major engine overhauls

• Packaging: Each cylinder head gasket is securely packed in protective packaging to prevent shipping damage
• Packaging Options: Neutral Box / Color Box / Custom Brand Package
• Suitable for: Wholesale distributors, engine rebuild shops, truck repair facilities, construction equipment service centers, and fleet owners