OEM 5-87815243-0 Cylinder Head Gasket ISUZU 4JJ1 4JJ1-TC 4JJ1-TCX 4JK1-TC 4JK1-TCX

1. Quick Notice

Confirm the Isuzu engine code (4JJ1, 4JJ1-TC, 4JJ1-TCX, 4JK1-TC or 4JK1-TCX) and the notch count on your original cylinder head gasket before ordering. This gasket is available in three thickness grades. Selection must be based on piston protrusion measurement. Professional diesel technician required for installation.

2. Description

The 5-87815243-0 is an OE-grade cylinder head gasket for Isuzu 4JJ1 (3.0L) and 4JK1 (2.5L) four-cylinder turbo diesel engines. Constructed from Multi-Layer Steel (MLS) with precision-embossed sealing beads, this gasket withstands extreme combustion pressure and high thermal cycling encountered in common-rail diesel applications. The cylinder head gasket is determined by the piston head projection from the cylinder body upper surface, in order to improve engine performance. Three thickness grades are available — identified by notch codes on the gasket tab (1 notch, 2 notches, or 3 notches). The MLS design requires a smooth and clean sealing surface. This gasket is a single-use component and must be replaced whenever the cylinder head is removed. Compatible with Isuzu D-Max, MU-X, KB Series, NPR, NQR, NKR trucks, Chevrolet Colorado (selected markets), and Isuzu ELF/N-Series commercial vehicle. Common failure symptoms include external coolant seepage at the head joint, persistent engine overheating, white exhaust smoke, milky oil (coolant-oil mixing), compression loss, and exhaust bubbles in the radiator overflow tank. Replacement restores factory sealing integrity and prevents cross-contamination of engine fluids.

3. Parameters Table

4. Custom Content

Thickness Selection Procedure: Selection must follow the Isuzu workshop manual. Clear carbon from piston heads and cylinder body surface-14. Use a dial indicator to measure piston projection from the cylinder block at positions 1, 2, 3, 4 for each cylinder. Obtain the maximum projection value across all four cylinders. Select the appropriate gasket grade based on the maximum measured value-14. Three grades are provided with different thicknesses.

MLS Construction: The steel layers feature embossed sealing beads that function as load-controlled springs, maintaining consistent contact pressure across the sealing surface even under thermal expansion and contraction.

Surface Preparation: Both cylinder head and block surfaces must be thoroughly cleaned with a plastic scraper. Do not use abrasive discs or wire brushes.

Torque Specification: Tighten head bolts in the specified sequence (center outward) using multiple progressive stages. Replace all head bolts with new torque-to-yield (TTY) units.

No Additional Sealant: Install the MLS gasket dry on clean surfaces. Do not apply gasket sealant or RTV silicone to the gasket itself.

5. FAQ

Q1: Which Isuzu engines use the 5-87815243-0 cylinder head gasket?
A1: This gasket fits Isuzu 4JJ1, 4JJ1-TC, 4JJ1-TCX (3.0L turbo diesel) and 4JK1-TC, 4JK1-TCX (2.5L turbo diesel) engines-.

Q2: Is this the same gasket as 8-97328887-2?
A2: No. 8-97328887-2 is a complete full gasket set that includes multiple components. 5-87815243-0 is the individual cylinder head gasket component only.

Q3: What thickness cylinder head gasket do I need?
A3: Selection is determined by measuring piston protrusion from the cylinder block. Three thickness grades are available — 1.05 mm (1 notch), 1.10 mm (2 notches), or 1.15 mm (3 notches) — identified by notch codes on the gasket tab.

Q4: What vehicles use the 4JJ1 and 4JK1 engines?
A4: These engines are found in Isuzu D-Max, MU-X, KB Series, NPR, NQR, NKR trucks, Chevrolet Colorado, and Isuzu ELF/N-Series commercial vehicles-.

Q5: What are common head gasket failure symptoms?
A5: External coolant seepage at the head joint, persistent engine overheating, white exhaust smoke, milky oil (coolant-oil mixing), compression loss, rough idle, and exhaust bubbles in the radiator overflow tank.