ISUZU NKR55 4JB1 Clutch Slave Cylinder Repair Kit with 22.22 mm Bore OEM Fit NBR/EPDM Rubber Seals
| Fluid Compatibility: | DOT 3 / DOT 4 Brake Fluid | Cylinder Bore Size: | 22.22 Mm (7/8 Inch) |
| Material: | NBR (Nitrile) / EPDM Rubber | Temperature Range: | −40°C To +120°C |
| Net Weight: | 0.08 Kg | Bolt Torque: | 37 N·m (3.8 Kgf·m / 27 Lb Ft) |
| Push Rod Play: | 2 Mm (0.1 In) | Kit Contents: | Cup Seals + Dust Boots + Related Seals |
| High Light: | 22.22 mm Bore Clutch Slave Cylinder Repair Kit,OEM Fit Hydraulic Clutch Sealing Kit,NBR/EPDM Rubber Clutch Slave Cylinder Seal Kit |
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Clutch Slave Cylinder Repair Kit 5-87831402-1 5878314021 for ISUZU NKR55 4JB1 — Verified OEM Fit 22.2 mm Bore Hydraulic Clutch Sealing Kit
This repair kit is a verified direct-fit replacement for ISUZU NKR55 light trucks equipped with the 4JB1 diesel engine. This critical hydraulic sealing component restores clutch hydraulic pressure and ensures smooth, reliable clutch disengagement.
The clutch slave cylinder repair kit functions as the primary hydraulic seal within the clutch slave cylinder. It converts hydraulic pressure from the clutch master cylinder into mechanical force that pushes the clutch release fork, disengaging the clutch disc from the flywheel. The cup-shaped seal features a precisely angled sealing lip that expands under hydraulic pressure — the greater the pedal force, the tighter the seal.
- Clutch fluid seepage past the dust boot — visible fluid traces on the slave cylinder body or bell housing
- Spongy or sinking clutch pedal — internal fluid bypass caused by worn or hardened cup seals reduces hydraulic pressure
- Difficulty engaging or disengaging gears — insufficient slave cylinder travel prevents full clutch release
- Clutch fluid contamination — degraded rubber particles from worn seals contaminate the clutch fluid
| Verification Item | Data / Standard | Source / Method |
|---|---|---|
| Part Number (Short) | 5-87831402-1 | ISUZU OEM Parts Database |
| Factory Number | 5878314021 | ISUZU OEM Parts Database |
| Engine Compatibility | 4JB1 / 4JB1-T (2.8L, 4-cylinder, OHV, DI) | ISUZU application catalog |
| Cylinder Bore Size | 22.22 mm (7/8 inch) | ISUZU workshop specification |
| Material | NBR (Nitrile) / EPDM Rubber | Material certificate |
| Slave Cylinder Bolt Torque | 37 N·m (3.8 kgf·m / 27 lb ft) | ISUZU NKR 4J Series Workshop Manual |
| Net Weight (per kit) | 0.08 kg | Product specification |
| Certification | ISO/TS 16949 | Third-party system audit |
Part Number: 5-87831402-1 5878314021
Product Name: Clutch Slave Cylinder Repair Kit
Car Model: NKR55
Engine Model: 4JB1
Condition: 100% Brand New
Material: High-strength aluminum alloy & precision bearings
| Brand | Model | Chassis | Engine | Years |
|---|---|---|---|---|
| ISUZU | ELF | NKR55 | 4JB1 | 1986–1993 |
| ISUZU | ELF | NKR55 | 4JB1 | 1996–2007 |
| ISUZU | ELF 100 | NHR | 4JB1 | 1984–1990 |
| Feature | Benefit + Verification Signal |
|---|---|
| NBR / EPDM Rubber Compound | Exceptional resistance to DOT 3 and DOT 4 brake fluid swelling, heat degradation, and compression set |
| OEM-Exact Lip Geometry (22.22 mm) | Cup-shaped sealing lip expands under hydraulic pressure for a tighter seal as clutch pedal force increases |
| Complete Kit Coverage | Includes all seals and dust boots needed for a professional clutch slave cylinder rebuild |
| ISO/TS 16949 Quality System | Full traceability with material certificates and batch inspection reports |
- Disassembly: Remove the slave cylinder from the transmission. Remove the push rod, boot, and piston assembly.
- Inspection: Inspect the cylinder bore for scoring, pitting, or corrosion. If damaged, replace the entire assembly.
- Cleaning: Clean all components with clean brake fluid or approved brake cleaner.
- Lubrication: Coat the new seals and cylinder bore with clean brake fluid before assembly.
- Assembly: Install the new cup seal with the sealing lip facing the hydraulic pressure source.
- Installation: Install the slave cylinder onto the transmission. Tighten bolts to 37 N·m.
- Adjustment: Verify push rod play is approximately 2 mm (0.1 in).
- Bleeding: Bleed the clutch hydraulic system completely to remove air.
- Pedal Test: Pump the clutch pedal several times to verify proper operation.
- Every 10,000 km: Check clutch fluid level and condition
- Every 40,000–50,000 km: Inspect clutch operation and slave cylinder travel
- Every 2 years: Replace clutch fluid regardless of mileage
- When clutch pedal feels spongy: Inspect slave cylinder seals immediately
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