Compressor Idler Pulley Assembly 8-98114437-0 8981144370 8-98051011-0 8980510110 For ISUZU NHR/NLR/NMR/NPR 4JJ1 4JK1 — OEM 76.7mm Iron Idler Pulley With Bracket

✅ Product Description

The Compressor Idler Pulley Assembly with OEM numbers 8-98114437-0 (also listed as 8981144370, 8-98051011-0, 8980510110) is a verified OEM-grade direct replacement for ISUZU NHR, NLR, NMR, NNR, and NPR series light and medium-duty trucks equipped with 4JJ1, 4JJ1-T, and 4JK1 diesel engines. As a critical component of the engine's accessory drive belt system, this idler pulley assembly maintains proper belt tension and alignment for the air conditioning compressor, ensuring efficient A/C performance and preventing belt slippage, noise, and premature wear.

Manufactured to ISUZU's stringent OEM specifications, this assembly features a precision-engineered 76.7mm outer diameter iron pulley with a 12mm width and is supplied complete with the mounting bracket for direct installation. This is the complete assembly, not just the pulley wheel — it includes the bracket and mounting provisions required for correct belt routing on the 4JJ1/4JK1 platform.

⚠️ Important Cross-Reference Note: Part numbers 8-98114437-0, 8981144370, 8-98051011-0, and 8980510110 are interchangeable for these applications. The assembly is also compatible with 8-97377328-0 / 8973773280 for related ISUZU D-MAX applications. Please verify your vehicle's specific requirements before ordering.

• ✅ OEM Specification — Verified by ISUZU OEM part numbers 8-98114437-0, 8981144370, 8-98051011-0, and 8980510110-.

• ✅ Precision 76.7mm Diameter — Verified by SKF VKM 69002 cross-reference specifications: 76.7mm diameter, 12mm width-12.

• ✅ Proven Durability — Constructed from high-quality iron material with a precision bearing for smooth rotation and long service life-1.

• ✅ Verified OEM Fitment — Confirmed for ISUZU NLR85, NMR85 (Euro 4) with 4JJ1-T engines, and compatible with NHR, NKR, NLR, NMR, NPR, NQR, NNR, NNS, NPS models-36-.

• ✅ Certified Genuine ISUZU Part — Listed as a genuine ISUZU spare part, exactly the same as the one mounted at the factory when the vehicle was new-18.

• ✅ Complete Assembly with Bracket — Supplied with mounting bracket for direct installation — no additional hardware required-.

[Failure Symptoms]
If your compressor idler pulley is failing, you may experience one or more of the following symptoms:

1. Squealing or Squeaking Noise: High-pitched noise from the engine bay, especially when the A/C is engaged — indicates a worn or dry pulley bearing.

2. Rumbling or Grinding Noise: A continuous rumbling or grinding sound from the accessory drive area — indicates internal bearing failure.

3. A/C Performance Issues: Weak or inconsistent A/C cooling — the idler pulley is not maintaining proper belt tension on the compressor.

4. Visible Belt Wear or Misalignment: The serpentine belt shows unusual wear patterns or is not tracking correctly on the pulleys — indicates a worn or misaligned idler pulley.

5. Pulley Wobble: Visible wobble or excessive play in the pulley when the engine is running — indicates a failed bearing or damaged pulley surface.

6. Belt Slippage: The belt slips on the pulley under load, producing a loud squealing sound and loss of A/C performance.

⚠️ A failing idler pulley can lead to serpentine belt failure, loss of A/C performance, and potential damage to other accessory drive components — prompt replacement is essential to maintain accessory drive system reliability.

✅ Vehicle & Engine Compatibility

⚠️ CRITICAL: This compressor idler pulley assembly is designed for ISUZU N-Series trucks with 4JJ1 and 4JK1 diesel engines. Verify your engine code and chassis code before ordering.

Primary Applications:

Cross-Brand Applications:

⚠️ Important:

• This idler pulley assembly is designed for the air conditioning compressor belt drive system on ISUZU 4JJ1 and 4JK1 engines.

• The 76.7mm diameter and 12mm width are critical — verify your original pulley dimensions before ordering.

• This is a complete assembly with mounting bracket — not just the pulley wheel.

• Part numbers 8-98114437-0 and 8-98051011-0 are interchangeable — both refer to the same assembly-.

• Please verify your vehicle's chassis code, production year, and engine code before ordering.

✅ Features & Benefits

✅ Quality Control & Verification

As a Genuine ISUZU OEM part, each idler pulley assembly meets ISUZU's stringent quality standards.

✅ Installation & Maintenance Recommendations

⚠️ IMPORTANT: Professional Installation Recommended

• Pre-Installation Checklist:

  • Allow the engine to cool completely before starting work.

  • Inspect the serpentine belt for cracks, glazing, or wear. Replace belt simultaneously for optimal performance.

  • Check all other idler pulleys and accessories for smooth operation.

  • Verify the new pulley's 76.7mm diameter and 12mm width match your original.

Installation Guidelines (Reference ISUZU workshop manual):

1. Disconnect the negative battery terminal.

2. Rotate the belt tensioner to relieve belt tension and remove the serpentine belt.

3. Remove the mounting bolts securing the old idler pulley assembly.

4. Remove the old pulley and clean the mounting surface thoroughly.

5. Install the new idler pulley assembly with the mounting bracket.

6. Torque the mounting bolts to manufacturer's specified torque settings (refer to ISUZU workshop manual).

7. Route the new serpentine belt according to the belt routing diagram.

8. Verify the belt is properly seated on all pulleys.

9. Start the engine and let it idle for 2-3 minutes to verify smooth operation and check for unusual noises.

Maintenance Schedule:

• Inspection: Every 50,000 km / 12 months. Listen for squealing or rumbling noises, check belt condition, and inspect pulley for wobble or play.

• Replacement: Recommended at 100,000 km or earlier if symptoms appear.

• Note: It is recommended to replace the idler pulley and serpentine belt simultaneously for optimal performance.

✅ Packaging & Supply

• Packaging: Each idler pulley assembly is securely packed in protective packaging to prevent shipping damage.

• Inner Packing: Plastic bag / Bubble bag.

• Outer Packing: Standard Export Carton.

• Suitable for: Wholesale distributors, auto parts retailers, commercial vehicle repair shops, and fleet owners.