OEM-grade Compressor Idler Pulley Assembly for ISUZU 4JJ1 and 4JK1 Engines with Precision-Balanced Construction
| Part Name: | Compressor Idler Pulley Assembly / Tensioner Pulley / V-Belt Tensioner Pulley | OEM Part Numbers: | 8-98114437-0, 8981144370, 8-98051011-0, 8980510110 |
| Engine Compatibility: | ISUZU 4JJ1, 4JK1 | Material: | High-strength Aluminum Alloy & Precision Bearings |
| Cooling Type: | Engine Coolant Circulation | Installation: | Direct OEM Replacement |
| Quality Standard: | OEM Equivalent / ISO Quality Control | Engine Details: | ISUZU 4JJ1 -- 3.0L, 4-cylinder, Common Rail Turbo Diesel, ISUZU 4JK1 -- 2.5L, 4-cylinder, Common Rail Turbo Diesel |
| High Light: | OEM ISUZU compressor idler pulley,4JJ1 engine idler pulley assembly,precision-balanced ISUZU pulley assembly |
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The Compressor Idler Pulley Assembly with OEM reference numbers 8-98114437-0 and 8-98051011-0 (also 8981144370 and 8980510110) is a verified direct-fit replacement for a wide range of ISUZU vehicles equipped with the 4JJ1 and 4JK1 engines. This pulley is a critical component of the engine's accessory drive belt system, designed to maintain proper belt tension and ensure reliable operation of the air conditioning compressor and other belt-driven accessories.
The idler pulley, also known as an intermediate pulley, serves as a guide for the drive belt, maintaining proper tension and alignment. A worn or failing idler pulley can lead to belt squeal, reduced A/C performance, overheating, and potential belt failure that could leave you stranded.
This OE-spec replacement assembly restores proper belt tension and accessory drive operation. Manufactured to meet or exceed original equipment standards, this pulley assembly delivers reliable performance under demanding operating conditions.
| Part Number | 8-98114437-0 / 8-98051011-0 |
|---|---|
| Product Name | Compressor Idler Pulley |
| Car Model | ISUZU D-MAX, TFUC, N-Series |
| Engine Model | ISUZU 4JJ1, 4JK1 |
| Condition | 100% Brand New |
| 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 |
Primary Applications (ISUZU 4JJ1 / 4JK1 Engines):
| Model | Engine / Notes |
|---|---|
| ISUZU D-MAX | 4JJ1, 4JK1 (2004-2011) |
| ISUZU TFUC | Pickup / Utility |
| ISUZU N-Series (NKR, NHR, NPR, NQR) | 4JJ1, 4JK1 |
| ISUZU ELF / 100P / 600P / 700P | 4JJ1, 4JK1 |
| ISUZU TFR / TFS | D-MAX platform |
Engine Details:
- ISUZU 4JJ1 - 3.0L, 4-cylinder, common rail turbo diesel
- ISUZU 4JK1 - 2.5L, 4-cylinder, common rail turbo diesel
| Symptom | Description |
|---|---|
| Belt squeal or chirping | Noise from the drive belt area, especially on startup or under load |
| A/C compressor not engaging | Insufficient belt tension causes the A/C compressor to slip or not engage |
| Visible wear or damage | Cracks, pitting, or roughness on the pulley surface |
| Bearing noise | Grinding or rumbling sound from the pulley area |
| Belt wear or fraying | Misalignment caused by a worn idler pulley |
- Complete belt failure and loss of A/C, power steering, or alternator function
- Overheating due to water pump not being driven
- Compressor damage from belt debris
- Costly repairs and vehicle downtime
Manufactured to original equipment standards — ensures perfect fit and reliable performance
Maximizes belt contact, eliminates slippage, and reduces harmonic vibration — extends belt and bearing life
No modifications required — matches factory mounting points and specifications precisely
Eliminates belt squeal and ensures reliable A/C and accessory operation
Replaces worn pulleys before they cause belt failure or damage to other components
Matches multiple OEM numbers (8-98114437-0, 8981144370, 8-98051011-0, 8980510110) — simplifies sourcing
Fits ISUZU D-MAX, N-Series trucks, ELF, and more — versatile for workshops and distributors
| QC Item | Verification Method |
|---|---|
| Dimensional accuracy | Precision inspection against OE blueprint — ensures proper fit on ISUZU 4JJ1/4JK1 engines |
| Bearing integrity | Spin and load testing — verifies smooth operation and load capacity |
| Surface finish | Visual and dimensional inspection — ensures proper belt contact |
| Balance | Dynamic balancing — reduces vibration and extends belt life |
| Material quality | High-grade materials verification — heat and wear resistance |
| Batch traceability | Each production batch documented with quality certificates |
Installation Guidelines (Reference ISUZU workshop manual for complete steps):
- Safety first — allow engine to cool completely before starting work
- Disconnect battery negative terminal
- Release belt tension following the workshop manual procedure
- Remove the drive belt from the idler pulley
- Remove the mounting bolt securing the idler pulley
- Remove the old pulley assembly
- Compare the new pulley with the old unit — verify part number matches
- Inspect the mounting bracket for wear or damage
- Install the new idler pulley assembly
- Torque mounting bolt to manufacturer specification
- Reinstall the drive belt — ensure correct routing
- Adjust belt tension to factory specification
- Reconnect battery
- Start engine and verify smooth operation — no squeal or noise
Maintenance Schedule:
- Inspect the idler pulley for wear, noise, or play during every service
- Replace the idler pulley if there is any sign of wear or bearing roughness
- Replace the drive belt when replacing the idler pulley
- Check belt tension regularly to prevent premature pulley wear
- Individually sealed in protective packaging
- Neutral packaging or custom branding available upon request
- Sold individually
- Bulk wholesale available in master cartons
- Suitable for: ISUZU specialist repair shops, commercial vehicle maintenance depots, 4x4 off-road centers, auto parts distributors
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