Compressor Idler Belt Tensioner Pulley Assembly 8-98031811-1 / 8980318111 For ISUZU 700P NPR NQR FRR FSR (4HK1) — 1.35 Kg, ISO/TS16949

The Compressor Idler Belt Tensioner Pulley Assembly with OEM references 8-98031811-1 / 8980318111 (and the dashed form 8-98031-811-1) is a verified replacement belt drive tensioner assembly for ISUZU 700P, NPR, NQR, FRR, and FSR commercial trucks equipped with the 4HK1 (5.2L) diesel engine. This is the complete tensioner assembly with pulley — the compressor idler pulley assembly that maintains correct belt tension on the air conditioning compressor drive belt, preventing belt slip, squeal, and premature belt or bearing failure.

The assembly is cataloged under multiple functional descriptions across the supply chain — "Pulley Asm; Idler Cmpr" (Idler Compressor Pulley Assembly), "Tensioner Bearing", "Belt Tensioner" (Натяжитель ремня), and "Compressor Idler Pulley Assembly" — all referring to the same tensioner/pulley unit in the compressor belt drive system. It is supplied as a complete assembly including the pulley, bearing, and tensioner arm, and is available in ISUZU Genuine, YIMI, and JMC branded options depending on the supply channel.

This assembly is the compressor idler belt tensioner — it maintains tension on the air conditioning compressor drive belt. It is not the main accessory drive belt tensioner, not the fan belt tensioner, and not a bare pulley without the tensioner arm. Confirm the required position and scope before ordering.

The assembly is confirmed for the ISUZU 4HK1 diesel engine across 700P, NPR, NQR, FRR, and FSR chassis. It is not a universal ISUZU tensioner — other engine families (4JB1, 4HG1, 4JJ1) use different compressor tensioner configurations. Confirm the engine code and chassis model before ordering.

This listing covers the complete tensioner assembly with pulley and bearing. The drive belt itself is not included and must be ordered separately if a complete belt service is required. Confirm the package contents at inquiry.

• OE Reference Group Verified: 8-98031811-1, 8980318111, 8-98031-811-1 are consistently grouped as interchangeable references across multiple supplier catalogs.
• Part Name & Function Verified: "Pulley Asm; Idler Cmpr" (Idler Compressor Pulley Assembly) and "Tensioner Bearing" — confirmed by ISUZU Genuine listing and Chinese wholesale catalog data. The assembly is described as the compressor idler pulley assembly for ISUZU FRR / FSR.
• Engine & Vehicle Coverage Verified: ISUZU 4HK1 engine — confirmed across Russian, Ukrainian, and Chinese supplier catalogs. 700P, NPR, NQR, FRR, FSR — confirmed by multiple independent listings.
• Net Weight Verified: 1.35 kg — confirmed by YIMI factory-direct data for the 8980318111 / 8-98031811-1 reference.
• HS Code Verified: 8483500005 — confirmed by YIMI factory data.
• Pack Quantity Verified: 1 PCS — confirmed by YIMI factory data.
• Brand & Supply Options Verified: ISUZU Genuine, YIMI, JMC, and ISUZU Motors branded options are all referenced across different supply channels.
• Warranty Reference: 3 months — confirmed by YIMI factory data.
• MOQ & Supply Reference: Small orders accepted with competitive wholesale pricing; delivery 15–20 days after payment confirmation — confirmed by YIMI supplier terms.
• Packaging Options Verified: Neutral box / Color box / Customer-branded packaging — confirmed by YIMI supplier data.

• Belt squeal or chirp on start-up or under A/C load: A worn tensioner bearing or a tensioner arm that no longer maintains correct belt tension allows the belt to slip, producing a high-pitched squeal — the most common symptom of a failing compressor tensioner.
• A/C performance loss or intermittent cooling: Belt slip on the compressor drive reduces compressor speed, leading to reduced refrigerant flow and poor cooling performance, especially at idle or under low-speed operation.
• Grinding or rumbling noise from the front of the engine: Worn pulley bearing races produce a continuous grinding or rumbling sound that changes with engine speed and may be more pronounced when the A/C is engaged.
• Visible belt wear or glazing: A failing tensioner accelerates uneven belt wear, glazing, or edge fraying — the belt may also begin to walk off the pulley.
• Tensioner arm seizure or excessive play: The tensioner arm may seize in one position or develop excessive play, preventing it from compensating for belt stretch and thermal expansion.
• Pulley misalignment or wobble: A worn bearing or bent tensioner arm causes the pulley to wobble or run out of alignment, accelerating belt and pulley wear.

A failed compressor belt tensioner can progress from belt squeal to complete belt failure, leaving the A/C compressor inoperative and potentially causing the belt to wrap around other engine components. On a working 700P or NPR commercial truck, loss of A/C function directly affects driver comfort and vehicle usability, especially in hot climates. A seized tensioner bearing can also overheat and damage the pulley, tensioner arm, and surrounding components, turning a bearing replacement into a complete tensioner assembly replacement.

• Engine and chassis are the first checks: This tensioner assembly is confirmed for 4HK1 engines in 700P, NPR, NQR, FRR, and FSR applications. Confirm the engine code and chassis model against the vehicle documentation before ordering.
• Complete assembly scope: This is the complete tensioner assembly with pulley and bearing. The drive belt is not included — order the correct compressor belt separately if a complete belt service is required.
• Brand and origin vary: Supply channels offer ISUZU Genuine, YIMI, JMC, and ISUZU Motors branded options. Specify brand and origin preference at inquiry if required for the application.
• Cross-reference caution: 8980492450, 8-98049-245-0, and 8980732610 are grouped as related references in some catalogs. While related, confirm the original unit's marking and physical dimensions before cross-application.

1. Confirm the required part first: Verify that the original unit is the compressor idler belt tensioner assembly and that the replacement's pulley diameter, bearing bore, and mounting configuration match the original unit. Confirm whether the drive belt is also being replaced.
2. Relieve belt tension: Use the appropriate tool to rotate the tensioner arm and relieve tension on the compressor drive belt. Do not pry against the tensioner body or pulley face.
3. Remove the old belt: Slide the belt off the pulleys. Inspect the belt for cracks, glazing, or fraying — replace the belt if any wear is evident.
4. Remove the old tensioner assembly: Unbolt the tensioner from its mounting bracket. Note the orientation and any spacers or alignment dowels.
5. Install the new tensioner assembly: Position the 8-98031811-1 tensioner in the original mounting location. Verify that the pulley aligns with the other belt pulleys before tightening the mounting bolts.
6. Reinstall the belt: Route the belt according to the engine belt diagram. Ensure the belt is fully seated in every pulley groove.
7. Release the tensioner to apply load: Slowly release the tensioner tool and confirm the belt is tensioned with no slack on the drive side.
8. Verify alignment and operation: With the engine off, rotate the crankshaft two full turns and re-check belt tracking. Start the engine and listen for squeal or chirp — a brief settling noise is normal; persistent squeal indicates incorrect tension or a contaminated pulley.

• Inspect the tensioner pulley and belt at every major service or every 20,000–30,000 km — check for bearing noise, pulley wobble, and belt wear.
• Replace the drive belt whenever the tensioner is replaced — reusing an old belt on a new tensioner can cause uneven wear and premature failure.
• Do not apply belt dressing — modern EPDM belts are not compatible with traditional dressings, which can cause slip and noise.
• Check pulley alignment if a replacement belt develops edge wear or tracking issues.

• Standard packing: Neutral box / Color box / Customer-branded packaging — confirmed by YIMI supplier terms.
• Package contents: 1 × Compressor Idler Belt Tensioner Pulley Assembly. Drive belt is NOT included unless explicitly stated — confirm at inquiry.
• Set options: Tensioner assembly only (standard) / tensioner + belt kit (where available) — specify at inquiry.
• Suitable for: ISUZU 700P / NPR / NQR / FRR / FSR belt drive and A/C system repair shops, commercial truck fleet maintenance departments, diesel engine accessory drive specialists, spare parts distributors, and export wholesalers.