ISUZU NKR NPR Rear Spring Shackle Bushing 22 mm Inner Diameter 46 mm Outer Diameter 45 mm Length OEM Fit
| Length: | 45 Mm | Center Bolt Torque: | 39 N·m (4 Kg·m / 29 Lb·ft) |
| Inner Diameter: | 22 Mm | Outer Diameter: | 46 Mm / 40 Mm |
| Material: | Rubber | U-Bolt Torque: | 177 N·m (18 Kg·m / 131 Lb·ft) |
| U-Bolt Torque NQR: | 284 N·m (29 Kg·m / 210 Lb·ft) | Weight: | 0.054 Kg |
| High Light: | 22 mm Inner Diameter Rear Spring Shackle Bushing,46 mm Outer Diameter Leaf Spring Bushing,45 mm Length Suspension Bushing |
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The Rear Spring Shackle Bushing with OEM numbers 8-94113323-2 and 8941133232 is a verified direct-fit replacement for ISUZU NKR / NPR / NHR / NQR light trucks equipped with the 4JB1 diesel engine. This bushing is a critical vibration-damping and load-bearing component of the rear leaf spring suspension system, responsible for absorbing road shock and reducing noise between the leaf spring shackle and the chassis frame.
The rear spring shackle bushing serves as the flexible pivot point between the leaf spring shackle and the chassis frame. It absorbs vertical and horizontal vibrations generated by road irregularities, preventing metal-to-metal contact and reducing noise, vibration, and harshness (NVH) transmitted to the vehicle chassis and cabin. The rubber construction allows controlled flex under load while maintaining precise suspension geometry, ensuring the leaf spring can articulate smoothly as the rear axle moves over uneven terrain.
Replace the bushing when any of these symptoms appear:
- Clunking or knocking noise from the rear suspension — worn or perished rubber allows the shackle to move, causing metal-to-metal contact.
- Excessive rear suspension vibration — degraded rubber loses its damping capability, transmitting road shock directly to the chassis.
- Rear axle misalignment — worn bushings allow the leaf spring to shift, affecting rear axle tracking and tire wear.
- Visible cracks, swelling, or hardening of the rubber — indicates the bushing has degraded and lost its elastic properties.
- Uneven or accelerated rear tire wear — misaligned rear suspension geometry from worn bushings causes irregular tire wear patterns.
| Verification Item | Data / Standard | Source / Method |
|---|---|---|
| Part Number (Short) | 8-94113323-2 | ISUZU OEM Parts Database |
| Part Number (Long) | 8941133232 | ISUZU OEM Parts Database |
| Part Name | BUSHING; RR SPRING SHACKLE | ISUZU EPC |
| Vehicle Models | ISUZU NKR55 / NPR / NHR / NQR | ISUZU application catalog |
| Engine Compatibility | 4JB1 (2.8L, 4-cylinder, OHV, DI) | ISUZU application catalog |
| Inner Diameter | 22 mm | Blue Print ADZ98012 specification |
| Outer Diameter | 46 mm / 40 mm (dual diameter) | Blue Print ADZ98012 specification |
| Length | 45 mm | Blue Print ADZ98012 specification |
| Weight (per unit) | 0.054 kg | Blue Print ADZ98012 specification |
| Material | Rubber | Product specification |
| Position | Rear Axle Left / Right | Product specification |
| Center Bolt Torque | 39 N·m (4 kg·m / 29 lb·ft) | ISUZU N-Series Workshop Manual |
| U-Bolt Torque (NQR) | 284 N·m (29 kg·m / 210 lb·ft) | ISUZU N-Series Workshop Manual |
| U-Bolt Torque (Except NQR) | 177 N·m (18 kg·m / 131 lb·ft) | ISUZU N-Series Workshop Manual |
| Installation Success Rate | ≥ 99% | Based on repair order tracking |
| Certification | ISO/TS 16949 | Third-party system audit |
| Brand | Model | Chassis | Engine | Years |
|---|---|---|---|---|
| ISUZU | ELF | NKR55 | 4JB1 | 1986–2007 |
| ISUZU | NPR | NPR | 4JB1 | 1986–2007 |
| ISUZU | NHR | NHR54 | 4JB1 | 1984–1990 |
| ISUZU | NQR | NQR | 4JB1 | 1996–2007 |
| ISUZU | ELF 100 | NHR | 4JB1 | 1984–1990 |
| ISUZU | NLR85 / NMR85 | — | 4JB1 | 2006–Present |
- This bushing is designed for the 22 mm inner diameter, 46/40 mm outer diameter, 45 mm length rear spring shackle application. Confirm the dimensions of your original bushing before ordering.
- The ISUZU N-Series rear suspension uses two bushings per side (one at each end of the shackle). Verify the required quantity before ordering.
- Bushings should be replaced in pairs (both sides of the rear axle) to maintain balanced suspension performance.
- For right-hand drive (RHD) vehicles, verify clearance and orientation. Refer to the ISUZU workshop manual for the correct procedure.
| Feature | Benefit + Verification Signal |
|---|---|
| High-Quality Rubber Compound | Excellent vibration damping and shock absorption for reduced NVH — verified by material certificate and functional testing. |
| OEM-Exact Dimensions (22*46*45 mm) | Precision-matched to ISUZU NKR/NPR rear spring shackle — direct drop-in fit without modification — verified by CMM dimensional inspection. |
| Dual Outer Diameter (46/40 mm) | Ensures proper seating in the shackle and frame mount — verified by dimensional sorting. |
| Complete Pair Availability | Bushings supplied in pairs for balanced suspension performance — verified by kit contents inspection. |
| ISO/TS 16949 Quality System | Full traceability with material certificates and batch inspection reports — third-party certified. |
| Installation Success Rate ≥ 99% | Based on repair order tracking — confirms reliable fitment across the NKR/NPR platform. |
Reference ISUZU N-Series Workshop Manual
- Preparation: Raise the vehicle on a hoist. Support the rear axle independently to relieve tension on the leaf springs.
- Removal: Remove the shackle pin nut and washer. Drive out the shackle pin with a hammer using a brass bar. Remove the shackle and take out the old rubber bushings.
- Inspection: Inspect the shackle pin for wear, scoring, or corrosion. Inspect the frame bracket bore for wear. Replace any damaged components.
- Installation: Press the new bushings into the shackle and frame bracket using a bench press and the dedicated bushing installer (ISUZU special tool 5-8840-2048-1 for rubber bushings).
- Assembly: Install the shackle and shackle pin. Apply chassis grease to the pin and bushing surfaces.
- Torque Sequence: Tighten the center bolt to 39 N·m (4 kg·m / 29 lb·ft). Tighten the U-bolt nuts to 284 N·m (29 kg·m / 210 lb·ft) for NQR models or 177 N·m (18 kg·m / 131 lb·ft) for other models.
- Final Check: Verify the spring is properly seated and centered on the axle. Check that the shackle articulates freely.
- Road Test: Lower the vehicle and perform a road test to verify suspension operation and noise levels.
| Fastener | Torque |
|---|---|
| Center Bolt | 39 N·m (4 kg·m / 29 lb·ft) |
| U-Bolt Nuts (NQR) | 284 N·m (29 kg·m / 210 lb·ft) |
| U-Bolt Nuts (Except NQR) | 177 N·m (18 kg·m / 131 lb·ft) |
| Clip Bolt | 20 N·m (2 kg·m / 14 lb·ft) |
- Every 10,000 km: Inspect bushings for cracks, swelling, or hardening. Check for abnormal noise from the rear suspension.
- Every 40,000–50,000 km: Inspect leaf spring assembly and shackle bushings. Replace bushings if wear or deterioration is found.
- Whenever the leaf spring is removed: Always inspect bushings and replace if any abnormality is detected.
- When abnormal noise is detected: Inspect bushings immediately. Replace in pairs.
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