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8943264410 T/M Front Cover Oil Seal For Isuzu NKR 55 77 NPR TF UC G5T+ 8981894240 Gearbox Front Oil Seal
Direct replacement T/M front cover oil seal (gearbox front oil seal / transmission input shaft seal) for Isuzu NKR 55/77, NPR, TF, UC, and G5T+ gearboxes OE cross reference: 1701601-PA11, 8981894240, 5096250180, 5096250183, 8943264410, 9097240330, 9099243590, 9099244640, 8-98189424-0, 5-09625018-0, 5-09625018-3, 8-94326441-0, 9-09724033-0, 9-09924359-0, 9-09924464-0 Precision size: 27mm (ID) × 43mm (OD) × 9mm (Width) Prevents transmission fluid leakage from front of gearbox – Seals input shaft Choose from 2 quality levels – China ISUZU (Qingling) Quality / Famous Brand Aftermarket Quality MOQ: 1 piece
Description
Products Specifications
| Parameter | Specification |
|---|---|
| Product Name | T/M Front Cover Oil Seal / Gearbox Front Oil Seal / Transmission Input Shaft Seal / Front Transmission Seal |
| OE Numbers | 1701601-PA11, 8981894240, 5096250180, 5096250183, 8943264410, 9097240330, 9099243590, 9099244640, 8-98189424-0, 5-09625018-0, 5-09625018-3, 8-94326441-0, 9-09724033-0, 9-09924359-0, 9-09924464-0 |
| Size | 27mm (Inner Diameter) × 43mm (Outer Diameter) × 9mm (Width) |
| Quality Options | China ISUZU (Qingling) Quality / Famous Brand Aftermarket Quality |
| Seal Type | Single-lip or dual-lip with garter spring |
| Material (Rubber) | NBR (Nitrile Butadiene Rubber) – Oil-resistant |
| Material (Case) | Cold-rolled steel with anti-corrosion coating |
| Spring Material | Carbon spring steel or stainless steel (premium grades) |
| Fitting Position | Transmission front cover – Input shaft seal |
| Oil/Grease Compatibility | Gear oil (GL-4, GL-5), transmission fluids |
| Operating Temperature | -40°C to 120°C |
| Compatible Gearboxes | Isuzu G5T+, MSB-5S, MSG-5B, and related manual transmissions |
| Compatible Models | Isuzu NKR 55/77, NPR, TF, UC (see fitment table) |
| H/S Code | 8487900000 |
| Place of Origin | China |
| MOQ | 1 piece |
| Warranty | 1 Year |
Product Overview
The T/M Front Cover Oil Seal (also known as gearbox front oil seal, transmission input shaft seal, or front transmission seal) is a critical sealing component installed in the front cover of Isuzu manual transmissions. This seal wraps around the transmission input shaft, preventing gearbox oil from leaking out at the point where the shaft enters the transmission case .
This oil seal is specifically designed for Isuzu NKR 55/77, NPR, TF, UC, and G5T+ series vehicles and gearboxes – widely used in light and medium-duty trucks, pickups, and commercial vehicles across Asia-Pacific, Middle Eastern, South American, and African markets.
Choose from 2 quality levels – China ISUZU (Qingling) Quality / Famous Brand Aftermarket Quality.The seal features a precision-molded rubber lip with an integrated garter spring that maintains constant pressure against the rotating input shaft, ensuring a tight seal even under varying temperatures and operating conditions . The metal outer case provides a secure press-fit into the transmission front cover bore.
Over time, the original front oil seal can harden, crack, or lose its sealing ability due to heat cycling, age, oil contamination, or shaft wear. A failed front transmission seal allows gearbox oil to leak past the input shaft, resulting in oil stains on the bellhousing, oil dripping from the transmission, low fluid levels, difficult shifting, and potential transmission damage due to inadequate lubrication .
Replacing a worn front cover oil seal with a high-quality unit restores proper transmission sealing, prevents fluid loss, protects the clutch from oil contamination, and extends gearbox life.
Related Products
More Related Parts You May Need
| Part | OEM Number (Typical) | Purpose |
|---|---|---|
| Transmission Front Cover Gasket | Various | Seals front cover to transmission case |
| Transmission Input Shaft | Various | Sealing surface for oil seal |
| Clutch Kit | Various | Replace while transmission is removed |
| Rear Main Seal (Engine) | Various | Replace while transmission is removed |
| Gearbox Fluid (GL-4/GL-5) | Various | Refill after seal replacement |
Signs Your Rubber Upper Cushion Needs Replacement
| Symptom | What You May Notice | What It Means |
|---|---|---|
| Transmission fluid leak from front of gearbox | Oil dripping from the bellhousing area – Oil on the bottom of transmission | Input shaft seal failure – Fluid escaping past the seal |
| Oil on clutch housing or inside bellhousing | Visible wetness or dripping when transmission is removed | Oil reaching clutch – Can cause clutch slippage |
| Oil spots under the vehicle after parking | Fresh gear oil spots on the ground, typically near the transmission | Active external leak – Seal no longer holding |
| Low transmission fluid level | Repeated need to top off gearbox oil | Gradual fluid loss through failed front seal |
| Burnt oil smell | Distinct gear oil odor from under the vehicle | Fluid leaking onto hot exhaust or engine components |
| Clutch slipping or grabbing | Engine revs but vehicle doesn't accelerate properly | Oil contamination of clutch friction material – Requires immediate attention |
| Difficult gear engagement | Hard shifting, grinding, or notchy feel | Low fluid level affecting gearbox lubrication |
| Whining or grinding noise from transmission | Unusual mechanical noises while driving | Insufficient lubrication due to fluid loss |
Installation Notes
| Step | Procedure |
|---|---|
| 1 | Remove the transmission from the vehicle (required for front seal access) |
| 2 | Remove the clutch release mechanism and clutch disc if present |
| 3 | Remove the transmission front cover bolts |
| 4 | Carefully remove the front cover from the transmission case |
| 5 | Pry out the old oil seal from the front cover (be careful not to scratch the seal bore) |
| 6 | Clean the seal bore and front cover thoroughly – Remove all old sealant and debris |
| 7 | Inspect the input shaft for wear, scoring, or grooves – Replace shaft or use a wear sleeve if damaged |
| 8 | Apply a thin layer of transmission fluid or grease to the new seal's lip |
| 9 | Press the new seal into the front cover using a proper seal driver or socket (do not hammer unevenly) |
| 10 | Ensure the seal is seated squarely and to the correct depth (flush or as specified) |
| 11 | Apply gasket sealant to the front cover mating surface (per manufacturer specification) |
| 12 | Reinstall the front cover – Torque bolts to factory specification |
| 13 | Allow sealant to cure before refilling transmission fluid |
| 14 | Reinstall clutch components and transmission |
| 15 | Refill transmission with correct grade and quantity of gear oil |
| 16 | Test drive and check for leaks at the front cover area |
Important Recommendations:
| Tip | Benefit |
|---|---|
| Replace the front seal whenever the transmission is removed for clutch service | Prevents future leaks – Cheap insurance |
| Inspect the input shaft for a wear groove | A grooved shaft will ruin a new seal quickly |
| Use a wear sleeve (Speedi-Sleeve) if shaft is grooved | Restores a smooth sealing surface without shaft replacement |
| Always replace the seal if the front cover is removed | Seals are single-use components |
| Use a seal driver – not a hammer and punch | Prevents seal distortion and uneven seating |
Why Choose Us?
29 Years Experience
Professional Isuzu parts supplier with rich industry experience, providing one-stop sourcing to save your time and procurement cost.
Two quality grades for flexible selection
China Isuzu (Qingling) OEM quality and famous brand aftermarket quality available, matching Isuzu NKR, NPR, TF, UC and other models to fit different budgets and durability demands.
Low MOQ & fast global delivery
1 piece available for single replacement or sample order; worldwide shipping within 1–8 working days.
Warranty & wholesale discount
1-year warranty for all items; favorable bulk price for fleets, repair shops and distributors, with professional technical support.
FAQs
Q1: What are the exact dimensions of this oil seal?
A: Size: 27mm (Inner Diameter) × 43mm (Outer Diameter) × 9mm (Width)
Inner Diameter (ID) : 27mm – Fits onto the transmission input shaft
Outer Diameter (OD) : 43mm – Presses into the transmission front cover bore
Width (Thickness) : 9mm – Overall seal height
Q2: What is the function of the T/M front cover oil seal?
A: This oil seal wraps around the transmission input shaft, preventing gearbox oil from leaking out at the point where the input shaft enters the transmission. A garter spring maintains constant sealing pressure, and an optional dust lip keeps contaminants out .
Q3: Will this seal fit my Isuzu G5T+ transmission?
A: Yes. This oil seal is specifically designed for Isuzu G5T+, MSB-5S, and MSG-5B transmissions found in NKR 55/77, NPR, TF, and UC vehicles. The 27×43×9mm size matches these gearboxes.
Q4: What are the symptoms of a failed front transmission seal?
A: Common symptoms include transmission fluid leaking from the bellhousing area, oil spots under the vehicle, low fluid levels, difficult shifting, grinding noises, and oil contamination of the clutch (causing clutch slippage) .
Q5: Can I replace the front seal without removing the transmission?
A: No. Accessing the transmission front cover requires removing the transmission from the vehicle. This seal is typically replaced during clutch replacement or transmission overhaul.
Q6: What is the difference between the two quality levels?
| Quality Level | Key Differences |
|---|---|
| China ISUZU (Qingling) Quality | Factory-grade – NBR rubber – Meets ISUZU OEM specifications – Best value |
| Famous Brand Aftermarket Quality | Premium Tier 1 brand (NOK, SKF, Corteco, etc.) – Superior elastomers – Enhanced durability |
One-stop Isuzu truck parts supplier from China,Focus on ISUZU parts sale over 29 years .
Our address
Baishiyi Jiulongpo District, High-tech Zone,Chongqing,China.
Phone Number/Whatsapp/wechat
+8617383152089
ZCMisuzu@guanglian99.com
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