Final Pinion Oil Seal 40×74×9/15.5 mm NBR Metal Case Dual-Lip TB Type for ISUZU UCS UBS D-MAX TFS Trooper
| Inner Diameter: | 40 Mm | Outer Diameter: | 74 Mm |
| Thickness: | 9 / 15.5 Mm | Seal Type: | TB Type, Dual-Lip |
| Material: | NBR (Nitrile Butadiene Rubber) + Metal Case | Position: | Front Differential Pinion |
| OEM Part Number: | 8-94318520-2 / 8943185202 | Engine Compatibility: | 4ZE1 / 4JH1 / 4JB1 / 4JA1 |
| High Light: | 40×74×9/15.5 mm Final Pinion Oil Seal,NBR Metal Case Differential Pinion Seal,Dual-Lip TB Type Pinion Shaft Seal |
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Final Pinion Rubber Oil Seal 8-94318520-2 8943185202 for ISUZU UCS UBS D-MAX TFS Trooper — Verified OEM Fit 40×74×9/15.5 mm NBR Differential Pinion Seal
This oil seal is a critical differential sealing component installed at the front differential pinion, responsible for retaining gear oil within the differential housing and preventing dust, water, and debris from entering the pinion bearing assembly.
The final pinion oil seal creates a dynamic seal between the rotating pinion shaft and the stationary differential housing. The dual-lip TB-type design features a primary sealing lip that maintains contact with the pinion flange surface under spring tension, and a secondary dust lip that blocks water, mud, and debris. The NBR (Nitrile Butadiene Rubber) construction provides excellent resistance to gear oil, high temperatures, and compression set.
- Gear oil leakage at the differential pinion — visible oil traces on the differential housing, driveshaft, or under the vehicle
- Oil accumulation on the pinion flange — oil being thrown outward by the rotating pinion flange indicates seal lip failure
- Differential noise or vibration — oil loss leads to insufficient lubrication, causing whining or rumbling from the differential
- Water or mud intrusion — damaged dust lip allows contaminants into the pinion bearing cavity, causing rust and pitting
- Low differential oil level — repeated oil level drops without visible external leaks indicate seal degradation
| Verification Item | Data / Standard | Source / Method |
|---|---|---|
| Part Number (Short) | 8-94318520-2 | ISUZU OEM Parts Database |
| Part Number (Long) | 8943185202 | ISUZU OEM Parts Database |
| Part Name | SEAL; OIL, FINAL PINION | ISUZU EPC |
| Inner Diameter | 40 mm | Euro4x4parts POS3244 specification |
| Outer Diameter | 74 mm | Euro4x4parts POS3244 specification |
| Thickness | 9 / 15.5 mm | Euro4x4parts POS3244 specification |
| Material | NBR (Nitrile Butadiene Rubber) + Metal Case | Product specification |
| Seal Type | TB Type, Dual-Lip | Product specification |
| Installation Success Rate | ≥ 99% | Based on repair order tracking |
| Certification | ISO/TS 16949 | Third-party system audit |
| Brand | Model | Chassis | Engine | Years |
|---|---|---|---|---|
| ISUZU | D-MAX I | TFS77 / TFS85 / TFS54 / TFS86 | 3.0 TD / 2.5 TD | 2003-2012 |
| ISUZU | D-MAX II | TFR / TFS | — | 2012-2020 |
| ISUZU | Trooper / Bighorn | UBS55 / UBS69 / UBS73 | 2.8 TD / 3.1 TD / 3.0 DTi | 1986-1998 |
| ISUZU | UCS17 | UCS17 | 4ZE1 | — |
| ISUZU | Amigo / Rodeo Sport | — | 4ZE1 | 1998- |
| ISUZU | Pickup | TF / TFR | 4JB1 / 4JA1 | 1988-2002 |
- This oil seal is designed for the 40×74×9/15.5 mm front differential pinion application
- The 8-94318520-2 is the -2 suffix version of the 8-94318520 series
- Always replace the pinion oil seal whenever the pinion flange, yoke, or differential is serviced
- For right-hand drive (RHD) vehicles, verify clearance and orientation
| Feature | Benefit + Verification Signal |
|---|---|
| NBR Rubber + Metal Case Construction | Excellent resistance to gear oil, high temperatures, and compression set — verified by material certificate and ASTM D471 immersion testing |
| Dual-Lip TB Type Design | Primary sealing lip retains gear oil while secondary dust lip blocks water and debris — verified by product specification and functional testing |
| OEM-Exact 40×74×9/15.5 mm Dimensions | Precision-matched to the ISUZU UCS/UBS/D-MAX differential pinion — direct press-fit installation without modification — verified by CMM dimensional inspection |
| Spring-Loaded Lip | Maintains consistent contact pressure on the pinion flange surface for reliable sealing at all operating speeds — verified by functional testing |
| ISO/TS 16949 Quality System | Full traceability with material certificates and batch inspection reports — third-party certified |
| QC Item | Verification Method / Standard |
|---|---|
| Inner Diameter (40 mm) | CMM, 100% inspection |
| Outer Diameter (74 mm) | CMM, 100% inspection |
| Thickness (9 / 15.5 mm) | CMM, 100% inspection |
| Lip Geometry Angle | Optical comparator, 100% inspection |
| Fluid Immersion Resistance | ASTM D471 — 70h @ 100°C in gear oil |
| Compression Set | ASTM D395 — 70h @ 100°C |
| Batch Traceability | Material lot number + production date |
- Preparation: Raise the vehicle on a hoist. Drain the differential oil into a suitable container. Remove the driveshaft from the pinion flange.
- Removal: Remove the pinion flange retaining nut and washer. Remove the pinion flange using a puller. Use a seal puller or pry bar to remove the old oil seal.
- Inspection: Inspect the pinion flange sealing surface for wear, scoring, or pitting. Inspect the pinion bearing for wear or damage.
- Cleaning: Clean the differential housing bore and pinion shaft thoroughly. Remove all old seal material and gear oil residue.
- Installation: Coat the new oil seal lip with clean gear oil. Use a seal driver or socket that matches the seal outer diameter to press the seal into the housing until fully seated.
- Flange Installation: Reinstall the pinion flange. Install the retaining nut and tighten to the specified torque per the ISUZU workshop manual.
- Final Check: Check the differential oil level and top up as needed. Verify no oil leakage at the seal.
- Road Test: Lower the vehicle and perform a road test to verify differential operation and check for leaks.
- Every 10,000 km: Inspect oil seal area for gear oil leakage. Check differential oil level.
- Every 40,000-50,000 km: Replace differential oil. Inspect pinion seal condition.
- Whenever the pinion flange is removed: Always replace the oil seal with a new unit.
- When differential noise is detected: Inspect oil seal and oil level immediately. Replace if any leakage is found.
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