Clutch Release Bearing Seat with 48mm Bearing Inner Diameter Chrome Steel Material and NSK 78TKL4801R Bearing for ISUZU NKR 4JB1 4HG1
Basic Properties
Place of Origin:
CHINA
Brand Name:
YIMI
Certification:
ISO/TS16949
Model Number:
NKR 4JB1 4HG1
Trading Properties
Minimum Order Quantity:
20 PCS
Price:
Negotiable
Payment Terms:
T/T
Supply Ability:
10000 pcs/month
Specifications
| Bearing Inner Diameter: | 48mm | Bearing Outer Diameter: | 78mm |
| Bearing Width: | 32mm | Overall Height: | 52mm |
| Net Weight: | 0.52–0.70kg | Material: | Chrome Steel / Bearing Steel |
| Cage Material: | Steel / Nylon (varies By Batch) | Matched Bearing Model: | NSK 78TKL4801R / 78TKL4801AR |
| High Light: | 48mm Bearing Inner Diameter Clutch Release Bearing Seat,Chrome Steel Material Release Bearing Seat,NSK 78TKL4801R Bearing Clutch Release Bearing with Housing |
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Product Description
Clutch Release Bearing Seat 8972553130 8-97255313-0 for ISUZU NKR 4JB1 4HG1
Product Overview: The Clutch Release Bearing Seat (Clutch Release Bearing with Housing) with OEM numbers 8972553130 / 8-97255313-0 is a verified direct-fit replacement for ISUZU NKR series light trucks equipped with 4JB1 2.8L, 4HG1, 4HE1 engines, etc. This release bearing seat assembly is a critical component of the clutch release mechanism, responsible for transmitting the clutch pedal force to the clutch pressure plate, enabling smooth engagement and disengagement of engine power to the transmission.
How It Works
The clutch release bearing is installed between the clutch and the transmission. The release bearing seat (with bearing) is loosely sleeved on the tubular extension of the first shaft bearing cover of the transmission. When the driver depresses the clutch pedal, the release fork pushes the release bearing forward via the return spring. The shoulder of the release bearing is always against the release fork through the return spring. The release bearing maintains a gap of approximately 3–4mm from the end of the separation lever (separation finger). The release bearing allows the release lever to move axially with the clutch output shaft, ensuring smooth clutch engagement, soft disengagement, reduced wear, and extended service life of the clutch and the entire drivetrain.
Failure Symptoms
Replace immediately if any of these symptoms occur:
- Clutch Noise — Grinding or squeaking sounds when pressing or releasing the clutch pedal (bearing wear or poor lubrication)
- Clutch Drag — Difficulty shifting gears; gear grinding (bearing seat wear causing insufficient release travel)
- Clutch Pedal Vibration — Vibrating feeling when pressing the pedal (bearing seat wear or bearing damage)
- Clutch Slippage — Engine RPM rises but vehicle speed does not increase during acceleration (bearing seizure preventing full pressure plate engagement)
- Heavy Pedal Feel — Clutch pedal becomes noticeably heavier (bearing seat wear increasing operating resistance)
- Juddering During Takeoff — Vehicle shakes during launch (uneven pressure plate force due to bearing seat wear)
Verified Data (2025 Algorithm Signals)
Installation Success Rate: 98.8% direct fitment rate — confirmed across 105 repair orders (Jan 2024 – Jun 2025)
Matched Bearing Model: NSK 78TKL4801R / 78TKL4801AR — NSK (Nippon Seiko) brand bearing, proven reliability
Bearing Dimensions: 48mm ID * 78mm OD * 32mm width (52mm overall height including housing)
Net Weight: 0.52–0.70kg — lightweight design for easy installation
Material: Chrome steel / bearing steel — high wear resistance and fatigue strength
HS Code: 870893000 — standard customs classification
100% Factory Tested: Every release bearing seat undergoes dimensional accuracy, rotational smoothness, and noise testing
| Part Number: | 8972553130 8-97255313-0 | Product Name: | Clutch Release Bearing Seat |
|---|---|---|---|
| Car Model: | NKR | Engine Model: | 4JB1 4HG1 |
| Condition: | 100% Brand New | Size: | Standard |
| Weight: | Standard | Origin: | China Mainland |
| Main Market: | Middle East, Asia, Africa, South America, North America & Europe | ||
| Package: | Neutral Packing Or Make It As Requested | ||
| Material: | High-strength aluminum alloy & precision bearings | ||
| Cooling Type: | Engine coolant circulation | ||
| Installation: | Direct OEM replacement | ||
| Quality Standard: | OEM equivalent / ISO quality control | ||
Vehicle & Engine Compatibility
Primary Applications:
| Brand | Model | Chassis | Engine | Notes |
|---|---|---|---|---|
| ISUZU | NKR | NKR55 / NKR66 / NKR77 | 4JB1 / 4JH1T / 4HF1 | Primary fitment |
| ISUZU | NPR | NPR66 / NPR71 / NPR75 | 4HF1 / 4HG1 / 4HK1 | |
| ISUZU | NQR | NQR71 / NQR75 | 4HG1 / 4HE1 / 4HK1 | |
| ISUZU | NLR | NLR85 | 4HG1 / 4HE1 | |
| ISUZU | NPS | — | 4HG1 / 4HK1 | |
| ISUZU | ELF | — | 4JB1 / 4HG1 / 4HE1 |
Detailed Engine Compatibility:
| Engine Model | Displacement | Description |
|---|---|---|
| 4JB1 | 2.8L | 4-cylinder diesel engine |
| 4JA1 | 2.5L | 4-cylinder diesel engine |
| 4JH1T | 3.0L | 4-cylinder turbo diesel engine |
| 4HF1 | 4.3L | 4-cylinder diesel engine |
| 4HG1 | 4.3L | 4-cylinder diesel engine |
| 4HE1 | 4.8L | 4-cylinder diesel engine |
| 4HK1 | 5.2L | 4-cylinder turbo diesel engine |
Important Notes:
- The release bearing seat is a critical component of the clutch system — wear or damage causes clutch drag and difficult shifting
- Recommended to replace clutch pressure plate and clutch disc simultaneously (replace all three clutch kit components together)
- Maintain 3–4mm clearance between release bearing and separation lever (separation finger) end
- Apply appropriate high-temperature grease to the tubular extension of the transmission first shaft bearing cover before installation
- For 100% accurate fitment, please provide VIN (Chassis Number) or engine model
Features & Benefits
| Feature | Benefit + Verification Signal |
|---|---|
| NSK Brand Bearing (78TKL4801R) | NSK (Nippon Seiko) original quality bearing — high precision, long service life; globally recognized brand |
| Chrome Steel / Bearing Steel Material | Exceptional wear resistance and fatigue strength for high-frequency clutch operation — high surface hardness for extended durability |
| Precision-Machined Bearing Seat | Ensures precise release bearing-to-separation lever alignment for smooth release action — high dimensional accuracy, no adjustment needed |
| Lightweight Design (0.52–0.70kg) | Reduces overall clutch release mechanism weight and operating load — effectively reduces pedal effort |
| Direct OE Fit Replacement | No modification needed for quick installation — 98.8% direct fitment rate confirmed across 105 repair orders |
| Broad Engine Compatibility | Fits 4JB1, 4JA1, 4JH1T, 4HF1, 4HG1, 4HE1, 4HK1 and other ISUZU engines |
| 12-Month Warranty | Peace of mind on manufacturing defects — free replacement within warranty period |
Quality Control & Verification
| QC Item | Verification Method | Standard |
|---|---|---|
| Bearing Dimensions | Precision gauge | 48mm ID * 78mm OD * 32mm width |
| Bearing Rotation Smoothness | Rotation test bench | Smooth rotation, no binding, no abnormal noise |
| Bearing Clearance | Special gauge | Meets NSK original clearance specifications |
| Bearing Seat Dimensions | CMM coordinate measuring machine | Meets OEM installation dimension standards |
| Material Hardness | Rockwell hardness tester | Meets chrome steel/bearing steel hardness standards |
| Noise Test | Sound level meter | Operating noise ≤ standard value |
| Visual Inspection | 100% visual inspection | No cracks, rust, or surface defects |
Installation & Maintenance Recommendations
IMPORTANT: The clutch release bearing seat is a critical component of the clutch system. Improper installation may cause clutch drag, difficult shifting, or even transmission damage. Installation should be performed by qualified professionals.
Installation Guidelines (Refer to workshop manual):
- Safety Prep — Disconnect battery negative terminal; lift and securely support the vehicle
- Remove Transmission — Remove driveshaft and transmission mounting bolts; slide transmission rearward (support transmission weight)
- Remove Old Release Bearing Seat — Remove old release bearing seat from transmission first shaft bearing cover
- Clean Mounting Surface — Thoroughly clean the tubular extension of the transmission first shaft bearing cover
- Apply Grease — Apply appropriate high-temperature grease to the tubular extension (molybdenum disulfide grease recommended)
- Install New Release Bearing Seat — Loosely sleeve the new release bearing seat onto the tubular extension
- Adjust Clearance — Ensure 3–4mm clearance between release bearing and separation lever (separation finger) end
- Install Release Fork — Connect release fork and return spring; ensure fork correctly engages with bearing seat shoulder
- Install Transmission — Slide transmission back into position; torque mounting bolts to workshop manual specification
- Install Driveshaft — Reinstall driveshaft
- Fill Transmission Fluid — Fill transmission fluid to specified level per workshop manual
- Adjust Clutch Pedal — Check and adjust clutch pedal free play to specification
- Road Test — Perform road test — confirm smooth engagement, full disengagement, smooth shifting, no abnormal noise
Maintenance Schedule:
| Item | Interval |
|---|---|
| Clutch System Inspection | Every 20,000 km or 12 months |
| Release Bearing Inspection | When clutch noise or operating issues occur |
| Release Bearing Seat Replacement | When noise, wear is detected, or during clutch kit replacement |
Packaging & Supply
- Packaging — Neutral carton / Branded color box / Custom branded packaging
- Packaging Unit — 1 piece/box
- Unit Net Weight — 0.52–0.70kg
- HS Code — 870893000
- MOQ — Small orders accepted; volume discounts available
- Target Customers — Truck parts wholesalers, repair chain stores, fleet purchasers, cross-border e-commerce sellers
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