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Cylinder Head Gasket 8-97375435-0 8973754350 For ISUZU NPR/NQR/NPR-HD 4HK1 5.2L Diesel — OEM Multi-Layer Steel (MLS) 2-Hole 1.60mm
Product Overview
The Cylinder Head Gasket with OEM numbers 8-97375435-0 and 8973754350 is a verified OEM-grade direct replacement for ISUZU 4HK1 5.2L diesel engines, commonly found in NPR, NQR, NPR-HD, and ELF series trucks.
Critical Fitment Note: The ISUZU 4HK1 engine uses three different thickness head gaskets based on piston protrusion. Using the wrong gasket can cause engine damage. Part number 8-97375435-0 is the 2-Hole (Two-Hole) variant with a thickness of 1.575-1.60mm.
Key Specifications:
Real Shop Test Data: For piston protrusion range: 0.0232"-0.0263" (0.589-0.669mm)
Proven Durability: Rated for 400,000+ km under normal operation
Installation Success Rate: 99% direct replacement fitment
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 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
A failing cylinder head gasket can lead to severe engine damage including warped cylinder heads, cracked engine blocks, or complete engine failure. Prompt replacement is essential.
Thickness & Notch Selection Guide
IMPORTANT: ISUZU 4HK1 engines use three different thickness head gaskets. Using the wrong gasket can cause engine damage. The correct gasket is determined by measuring piston protrusion.
Gasket Grade / Notch
Projection Value
Gasket Thickness
Part Number
No-Hole
0.0173"-0.0204" (0.439-0.519mm)
1.500mm
8-97375433-21
1-Hole
0.0204"-0.0232" (0.519-0.589mm)
1.550mm
8-97375434-21
2-Hole
0.0232"-0.0263" (0.589-0.669mm)
1.575-1.60mm
8-97375435-21
How to Determine the Correct Gasket
Clean the engine block deck of all gasket material, carbon, or other debris
Place a dial indicator on the deck surface and measure piston protrusion at TDC
Measure each of the four cylinders
The gasket to use is based on the highest projection value recorded
Hole ID Location: Check the gasket for holes - can be no hole, one hole, or two holes depending on thickness
Please confirm with your customer:
Piston protrusion measurement from the engine (highest value)
Hole count on the original gasket (0, 1, or 2 holes)
Original part number from the old gasket
Vehicle & Engine Compatibility
Primary Applications
Brand
Model
Chassis / Series
Engine
Years
ISUZU
NPR / NPR-HD
N-Series
4HK1 5.2L
2005-2018
ISUZU
NQR
N-Series
4HK1 5.2L
2005-2018
ISUZU
NPR75
N-Series
4HK1-TCS
2005-10/2007
ISUZU
ELF 400 / 500 / 600
N-Series
4HK1 5.2L
2022-12
Cross-Brand / Equipment Applications
Brand
Equipment Type
Models
Engine
Hitachi
Crawler Excavators
ZX200-3, ZAX240-3
4HK1
JCB
Construction Equipment
Various
4HK1
Important:
This cylinder head gasket is designed for ISUZU 4HK1 5.2L diesel engines only
CRITICAL: This is a 2-Hole (1.575-1.60mm) gasket - verify your engine requires this thickness before ordering
Please verify your vehicle's VIN number, engine serial number, or model code before ordering
Features & Benefits
Feature
Benefit + Verification Signal
OEM Specification - ISUZU Genuine Equivalent
Guarantees factory-fit quality and performance - verified by OEM part numbers
Multi-Layer Steel (MLS) Stainless Steel Construction
Delivers superior sealing under extreme combustion pressure and temperature
1.575-1.60mm Thickness (2-Hole)
Enables correct compression ratio maintenance for specified piston protrusion
Anti-Fatigue Design
Minimizes gasket fatigue and increases reliability against gas and water leakage
115.5mm Bore Diameter
Precision-matched to 4HK1 cylinder bore specifications
Lightweight Construction (0.395kg)
Easy to handle and install
Cross-Industry Compatibility
Fits ISUZU trucks and construction equipment
Direct Replacement Fitment
No modifications required - verified by 99% installation success rate
100% New - No Core Charge
Guarantees zero wear, immediate sealing performance, and full service life
Quality Control & Verification
QC Item
Verification Method
Dimensional Accuracy
Precision inspection to verify 1.575-1.60mm thickness, 2-hole count, and 115.5mm bore diameter
Material Composition
Stainless steel / MLS layer analysis to verify anti-fatigue characteristics and heat resistance
Leakage Test
100% pressure testing to guarantee zero gas, coolant, or oil leakage
Compression Simulation
Dynamic compression testing to verify sealing performance under operating conditions
Durability Cycle Test
500+ hour thermal cycling and pressure cycling to verify 400,000+ km service life
Final Assembly Inspection
100% visual and dimensional inspection before packaging
Installation & Maintenance Recommendations
IMPORTANT: Professional Installation Highly Recommended
Replacing a cylinder head gasket requires proper torque specifications, correct gasket positioning, and thorough engine component inspection.
Pre-Installation Checklist
Verify gasket thickness matches the original - confirm 2-Hole (1.575-1.60mm) designation
Measure piston protrusion for each of the four cylinders - use the highest value recorded
Inspect the cylinder head and engine block sealing surfaces for warpage or damage
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
Installation Guidelines
Ensure the engine is completely disassembled with the cylinder head removed
Clean the cylinder head and engine block sealing surfaces with appropriate solvent
Check the flatness of both surfaces using a precision straightedge and feeler gauge
CRITICAL: Position the new gasket correctly - ensure the 2-hole orientation matches OEM specifications
Install the cylinder head onto the gasket
CRITICAL: Follow the angular tightening method specified in the ISUZU workshop manual
Torque cylinder head bolts in the correct sequence and to the specified torque values
Reassemble remaining engine components
Refill with fresh coolant and engine oil
Start the engine and check for leaks
Perform a cooling system pressure test to verify seal integrity
Maintenance Schedule
Inspection: During any cooling system service or if overheating symptoms appear
Replacement: Immediately if failure symptoms appear. Also recommended during major engine overhauls
Packaging & Supply
Packaging: Protective packaging (neutral box, color box, or custom brand package)
Pack Quantity: 1 PCS
Net Weight: 0.395 kg
H/S Code: 848410000
MOQ: Small quantity accepted; quantity discounts available
Suitable for: Wholesale distributors, engine rebuild shops, truck repair facilities, construction equipment service centers, and fleet owners
Yimi (Guangzhou) Automotive Parts Co., Ltd.
Located in Guangzhou—the economic and transportation hub of Southern China—we are a specialized supplier and exporter with over 20 years of experience in the automotive parts industry. We focus on the production and sales of high-quality ... Yimi (Guangzhou) Automotive Parts Co., Ltd.
Located in Guangzhou—the economic and transportation hub of Southern China—we are a specialized supplier and exporter with over 20 years of experience in the automotive parts industry. We focus on the production and sales of high-quality ...
