Isuzu 4HK1 Excavtor Engine Cylinder Head Gasket 8-97375-433-0 8973754330

1. Quick Notice

Confirm the Isuzu engine code (4HK1-TC, 4HK1-TCN, 4HK1X, etc.) and the gasket thickness mark on your original cylinder head gasket before ordering. This gasket is also available in 1.55 mm (8-97375-434-0) and 1.60 mm (8-97375-435-0) variants. Professional installation required-3.

2. Description

The 8-97375-433-0 / 8973754330 cylinder head gasket is an OE-specification sealing component for Isuzu 4HK1 series 5.2L four-cylinder turbo diesel engines. Constructed from Multi-Layer Steel (MLS) with precision-embossed sealing beads, this gasket withstands extreme combustion pressures and high-temperature thermal cycling. The 4HK1 engine features a robust cast iron block, 115 mm bore × 125 mm stroke, 5,193 cc displacement, and compression ratio varying by model year: 18.5:1 (2005–2006), 17.5:1 (2007–2015), or 16.5:1 (2016–2020). Direct replacement for Isuzu 700P trucks, N-Series, NPR, NQR, FRR, FSR, and Hitachi excavators including ZX200-3, ZX330, ZX350H, ZX350K, ZX500. Common failure symptoms include external coolant seepage at the head joint, persistent engine overheating, white exhaust smoke, milky oil, compression loss, and exhaust bubbles in the radiator overflow tank.

3. Parameters Table

4. Custom Content

Thickness Grades: The 4HK1 cylinder head gasket is available in three thickness grades. Selection is determined by the notch count on your original gasket tab: Grade 1 (1.50 mm / 8-97375-433-0), Grade 2 (1.55 mm / 8-97375-434-0), Grade 3 (1.60 mm / 8-97375-435-0)-3. Piston protrusion measurement is required for correct grade selection.

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

Torque Specification: Tighten head bolts in the specified sequence (center outward) using multiple progressive stages. First stage: 98 N·m; second stage: 147 N·m; final stage: 30°–60° angle tightening. Always replace head bolts with new units. Apply molybdenum disulfide to M14 bolt threads and engine oil to M10 bolt threads before installation.

No Additional Sealant: MLS gaskets require no sealant. Install gasket dry on clean surfaces. Do not apply RTV or any gasket sealant.

5. FAQ

Q1: Which Isuzu engines use the 8-97375-433-0 cylinder head gasket?
A1: This gasket fits Isuzu 4HK1-TC, 4HK1-TCN, 4HK1X, and 4HK1XQA 5.2L four-cylinder turbo diesel engines.

Q2: Are 8-97375-433-0 and 8973754330 the same gasket?
A2: Yes. Both numbers reference the identical cylinder head gasket. 8-97375-433-0 is the OEM hyphenated format; 8973754330 is the condensed form.

Q3: What thickness cylinder head gasket do I need?
A3: Select based on the notch count on your original gasket: 1.50 mm (Grade 1 / 8-97375-433-0), 1.55 mm (Grade 2 / 8-97375-434-0), or 1.60 mm (Grade 3 / 8-97375-435-0). Piston protrusion measurement from the cylinder block determines the correct grade.

Q4: What are common head gasket failure symptoms on a 4HK1?
A4: 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.

Q5: What is the cylinder head bolt torque specification for the 4HK1?
A5: First stage: 98 N·m; second stage: 147 N·m; final stage: 30°–60° angle tightening. Always replace head bolts with new torque-to-yield (TTY) units and apply molybdenum disulfide to M14 bolt threads.

Q6: Do I need new cylinder head bolts?
A6: Yes. Always replace cylinder head bolts with new units. Reused bolts have permanent stretch from previous torque cycles and may not achieve correct clamp load.

Q7: Is sealant required for installation?
A7: No. MLS cylinder head gaskets seal without additional sealant. Install dry on clean, properly prepared surfaces. Do not apply gasket sealant or RTV silicone to the gasket.

Q8: What vehicles and equipment use the 4HK1 engine?
A8: The 4HK1 engine is found in Isuzu 700P trucks, N-Series, NPR, NQR, FRR, FSR, and Hitachi excavators including ZX200-3, ZX330, ZX350H, ZX350K, ZX500W.