2022 Isuzu NPR Serpentine Belt Routing & Length

Quick answer

• Belt Length: 2120 mm
• Rib Count: 8-rib
• OEM Belt PN: 8-98004-332-0
• Aftermarket Cross-Refs: Gates K080834, Dayco 5080835, Continental 4080834
• Auto-Tensioner PN: 8-98004-330-0
• Idler Pulley PN: 8-98004-331-0

Belt routing

Before you begin, we recommend taking a photo of the existing serpentine belt routing to avoid any confusion during reinstallation. The belt follows this path:

1. Starts at the crankshaft pulley at the bottom.
2. Goes up to the A/C compressor.
3. Across to the idler pulley.
4. Down to the alternator.
5. Over to the power steering pump.
6. Up to the water pump.
7. Finally, around the tensioner.

How to replace the serpentine belt

To replace the serpentine belt, you will need a serpentine belt tool or a 3/8" breaker bar. Insert the tool into the square hole on the auto-tensioner and rotate it to release the tension on the belt. While the tension is released, slide the belt off of one of the pulleys. Carefully and slowly release the tensioner back to its resting position. After removing the old belt, it is a good time to inspect all the pulleys for wear and spin the tensioner and idler pulleys to check for any noise or roughness.

To install the new belt, route it around all the pulleys except for the idler pulley, leaving it for last. With the belt routed, use the serpentine belt tool to release the tension on the tensioner again and slide the new belt under the idler pulley. Double-check that the belt is correctly seated in the grooves of all the pulleys before starting the engine.

Replacement interval

The recommended replacement interval for the serpentine belt on a 2022 Isuzu NPR is every 100,000 miles. However, it is a good idea to inspect the belt at every oil change for signs of wear and tear.

Signs of a failing belt or tensioner

• Squealing or chirping noises: This is often the first sign of a failing belt. The noise may be more noticeable in cold or wet weather.
• Visible wear: Inspect the belt for cracks, fraying, or missing ribs. Any of these signs indicate that the belt needs to be replaced.
• Loss of power steering or A/C: The serpentine belt drives these accessories, so a failing belt can cause them to stop working.
• Engine overheating: The serpentine belt also drives the water pump. If the belt fails, the engine can overheat, which can cause serious damage.
• Rattling or grinding noises: These noises can indicate a failing tensioner or idler pulley.

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