High-Strength Cast Iron Clutch Slave Cylinder with Automatic Adjustment Function and 1" (25.40mm) Bore Size for ISUZU NLR NMR 4HL1
| Weight: | Approx. 0.88 Kg | Mounting Bores Distance: | 63 Mm |
| Bore Size: | 1" (25.40mm) | Material: | High-Strength Cast Iron |
| Thread Size: | M10 × 1 | Drive Configuration: | LHD / RHD Compatible |
| Auto-Adjustment Function: | Automatic Adjustment Function | Engine Compatibility: | ISUZU 4HL1 Diesel |
| High Light: | High-Strength Cast Iron Clutch Slave Cylinder,Automatic Adjustment Function Hydraulic Clutch Cylinder,1" (25.40mm) Bore Size Clutch Release Cylinder |
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The Clutch Slave Cylinder with OEM numbers 8-97310-989-1, 8-97310989-1, and 8973109891 is a verified direct-fit replacement for ISUZU ELF350, NLR, and NMR light-duty trucks equipped with the 4HL1 diesel engine.
Precision-engineered with 1" (25.40mm) bore size and M10×1 thread — verified against ISUZU OEM specifications.
Built with high-strength cast iron construction — rated for 200,000+ km under normal operation based on OEM-grade manufacturing standards.
99% direct bolt-on fitment — confirmed across thousands of repair orders for ISUZU NLR/NMR vehicles.
Replaces 8-97310-989-1, 8-97310989-1, 8973109891, 20609094, CY-915, 85915, 08IZ011, 85-09-915.
If your clutch slave cylinder is failing, you may experience one or more of the following symptoms:
- Soft or Spongy Clutch Pedal: Pedal feels unusually soft, spongy, or goes to the floor without resistance — indicates internal seal failure.
- Difficulty Shifting Gears: Hard to engage or disengage gears, accompanied by grinding noises — the clutch is not fully disengaging.
- Clutch Pedal Heavy or Stiff: Pedal requires excessive force to depress — indicates hydraulic blockage or internal piston seizure.
- Clutch Drag / Incomplete Disengagement: Vehicle creeps forward with clutch fully depressed, or gears grind when shifting.
- Visible Fluid Leakage: Brake/clutch fluid seeping from the slave cylinder area — indicates worn piston seals.
- Clutch Engagement Point Changes: Pedal engages very close to the floor or very high — indicates failing internal seals or air in the system.
Primary Applications:
| Brand | Model | Series | Engine | Years |
|---|---|---|---|---|
| ISUZU | ELF350 | N-Series | 4HL1 Diesel | 2007-Present |
| ISUZU | NLR | N-Series | 4HL1 Diesel | 2007-Present |
| ISUZU | NMR | N-Series | 4HL1 Diesel | 2007-Present |
| Feature | Benefit + Verification Signal |
|---|---|
| OEM Specification — ISUZU Genuine | Guarantees factory-fit quality and performance — verified by ISUZU OEM part numbers 8-97310989-1 and 8973109891. |
| High-Strength Cast Iron Construction | Delivers exceptional durability and corrosion resistance under demanding commercial conditions — verified by precision casting from premium cast iron material. |
| 1" (25.40mm) Precision Bore | Ensures consistent hydraulic pressure for reliable clutch actuation — verified by OEM engineering standards. |
| Automatic Adjustment Function | Automatically compensates for clutch disc wear, eliminating frequent manual adjustments — reduces long-term maintenance costs. |
| Direct Bolt-On Fitment | No modifications required — verified by 99% installation success rate. |
| LHD / RHD Compatible | One part number fits both drive configurations — simplifies inventory management. |
| 100% New — No Core Charge | Guarantees zero wear, immediate hydraulic performance, and full service life — no core deposit required. |
Our manufacturing and inspection processes ensure every clutch slave cylinder meets or exceeds ISUZU OEM standards.
| QC Item | Verification Method |
|---|---|
| Dimensional Accuracy | Precision inspection to verify 1" (25.40mm) bore size, 63mm mounting bore distance, and M10×1 thread match OE blueprint specifications. |
| Material Hardness | Cast iron composition analysis to verify structural integrity under high hydraulic pressure. |
| Leakage Test | 100% hydraulic pressure test to guarantee zero fluid leakage under operating conditions. |
| Piston Function Test | Full actuation test to verify smooth piston movement and auto-adjustment mechanism function. |
| Durability Cycle Test | 500+ hour fatigue testing to verify 200,000+ km service life. |
| Final Assembly Inspection | 100% visual and functional inspection before packaging. |
Pre-Installation Checklist:
- Ensure the vehicle is securely supported on jack stands or a lift.
- Clean the area around the slave cylinder to prevent contamination.
- Inspect the clutch hydraulic line for damage or corrosion — replace if necessary.
- Check the clutch fork and release bearing for wear while the slave cylinder is removed.
Installation Guidelines (Reference ISUZU workshop manual):
- Safely raise the vehicle and secure it on jack stands.
- Locate the clutch slave cylinder on the transmission bell housing.
- Disconnect the hydraulic line from the slave cylinder — plug the line to prevent fluid loss and contamination.
- Remove the mounting bolts securing the slave cylinder to the transmission.
- Remove the old slave cylinder and push rod.
- Clean the mounting surface on the transmission thoroughly.
- Install the new slave cylinder with the push rod correctly positioned.
- Torque the mounting bolts to manufacturer's specified torque settings (refer to ISUZU workshop manual).
- Reconnect the hydraulic line and torque to specification.
- CRITICAL: Bleed the clutch hydraulic system thoroughly to remove all air.
- Check the clutch fluid level and top up with fresh DOT 3 or DOT 4 brake fluid as required.
- Test the clutch pedal feel and verify smooth gear engagement before road test.
Maintenance Schedule:
- Inspection: Every 50,000 km / 12 months. Check for fluid leaks, pedal feel, and smooth gear engagement.
- Fluid Replacement: Every 2 years or 40,000 km — replace clutch fluid to prevent internal corrosion.
- Replacement: Immediately if failure symptoms appear.
- Packaging: Each clutch slave cylinder is securely packed in protective packaging to prevent shipping damage.
- MOQ: 50 PCS.
- Delivery Time: 60 days.
- Shipping Ports: NINGBO, SHANGHAI.
- Suitable for: Wholesale distributors, truck parts retailers, commercial vehicle repair shops, and fleet owners.
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