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Engine Idle Gear Shaft 8-97186398-1 8971863981 for ISUZU FVR FRR FSR EXZ 700P NPR NQR 6HK1 4HK1 4HG1 Diesel Engine — OEM Equivalent Direct-Fit Replacement with Forged Steel Construction
Part Number
8-97186398-1 8971863981
Product Name
Idle Gear Shaft
Car Model
FVR FRR 700P
Engine Model
6HK1 4HK1
Condition
100% Brand New
Material
High-strength aluminum alloy & precision bearings
Cooling Type
Engine coolant circulation
Quality Standard
OEM equivalent / ISO quality control
Vehicle & Engine Compatibility
Primary Applications (ISUZU Commercial Vehicles)
Brand
Model
Engine
Years
ISUZU
FVR
6HK1
2008+
ISUZU
FRR
6HK1
Same as above
ISUZU
FSR
4HK1
Same as above
ISUZU
EXZ
6HK1
Same as above
ISUZU
700P
4HK1 / 6HK1
Same as above
Construction Machinery Applications
Brand
Equipment Model
Engine
Hitachi
ZX200 / ZX210 / ZX240 / ZX330 / ZX350, etc.
4HK1 / 6HK1
JCB
Various excavators
4HK1 / 6HK1
Case
CX210 / CX230 / CX300 / CX330, etc.
4HK1 / 6HK1
Denyo
DCA-125 Generator
4HK1 / 6HK1
⚠️ Important:
Before ordering, verify that your original idle gear shaft's timing position (Shaft A/B/C/D), outside diameter, and oil passage hole position match the product
8-97186398-1 and 8-97186398-0 are adjacent variant numbers for different 6HK1/4HK1 engine configurations
This idle gear shaft is also used in Hitachi and JCB construction machinery with 4HK1/6HK1 engine applications
For fitment confirmation, please provide VIN number or engine nameplate photo
Features & Benefits
Feature
Benefit + Verification Signal
Forged Steel construction (42CrMo)
High strength and fatigue resistance, withstanding repeated loads at high RPM in the timing gear train — suited for 6HK1/4HK1 turbocharged diesel engine conditions
Precision-ground journals
Ensures accurate clearance fit with idler gear bushing (standard clearance 0.025-0.085mm), reducing gear train noise and wear — per ISUZU workshop manual standards
Mounting position and dimensions meet OEM specifications, requiring no additional machining, suitable for engine overhaul replacement
100% factory testing
Every unit undergoes full inspection before shipment, ensuring installation reliability and dimensional accuracy
Quality Control & Verification
QC Item
Verification Method
Journal outside diameter accuracy
Micrometer measurement against OEM specs
Journal surface roughness
Surface roughness tester
Gear mesh clearance
Feeler gauge / dial indicator inspection
Oil passage clearance
Air/oil flow test
Appearance & surface defects
Visual inspection + magnetic particle inspection
100% factory testing
Piece-by-piece dimensional and visual inspection
Installation & Maintenance Recommendations
⚠️ IMPORTANT: Idle gear shaft installation requires professional tools and experience. Professional installation is strongly recommended. Disconnect the negative battery terminal before installation. Ensure the engine is completely cool.
Installation Guidelines
Refer to ISUZU 6HK1/4HK1 workshop manual for exact specifications:
Clean the timing gear case interior; inspect the idle gear shaft mounting bore for wear or damage
Inspect the new idle gear shaft journal for scratches or corrosion; verify oil passage is clear
Install the idle gear shaft into the timing gear case locating bore, aligning the oil passage hole and dowel pin
Install the idler gear and thrust plate; confirm gear mesh clearance is within specification
Tighten idle gear shaft mounting bolts in a diagonal sequence to specified torque 31 N·m (3.2 kgf·m / 23 lb ft)
Install the timing gear case cover; fill engine oil to the standard level
Start the engine and check for abnormal noise from the timing gear train
Maintenance Schedule
Inspect timing gear train noise and oil condition every 40,000 km
Inspect idle gear shaft wear at 80,000-100,000 km or upon timing gear noise
Under normal maintenance conditions, 6HK1/4HK1 idle gear shafts can exceed 200,000 km service life (varies by operating conditions and maintenance quality)
Engine oil change recommended every 10,000-15,000 km to ensure proper timing gear train lubrication
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 ...
