Description

Mercury Marine 25-9470 is a V-belt reference for accessory-drive service where a 47-inch effective-length belt is required. This belt size is commonly cross-referenced with Gates 9470, a heavy-duty Automotive XL V-belt, and related belt listings show 25-9470 as a NAPA belt reference with the same general 9470 belt family sizing. Gates lists the 9470 with a 47 in. effective length, 12 mm / 0.48 in. top width, 47.61 in. outside circumference, HC50 section, and a notched construction for flexibility and pulley grip.

Key Features

• V-belt for supported accessory-drive applications
• Belt family reference: 9470 / 25-9470
• Effective length: 47 in. / 1194 mm
• Outside circumference: 47.61 in. / 1209 mm
• Top width: 0.48 in. / 12 mm
• Section: HC50
• Notched belt construction for flexibility
• EPDM belt material with polyester cord construction in Gates 9470 reference data
• Meets or exceeds SAE J636C specifications in Gates 9470 reference data

Engine Compatibility

This belt should be matched by the original belt number, pulley layout, belt length, belt width, and accessory-drive configuration. Cross-reference data for the 9470 belt family includes a MerCruiser-related reference 960470, but the safest fitment method is to confirm the existing belt number and engine/accessory-drive layout before ordering.

Serial Number Fitment Notice

V-belt fitment varies by engine model, pulley arrangement, alternator bracket, raw-water pump setup, power steering, and accessory configuration. Always confirm compatibility using the engine serial number and the existing belt number before ordering. A belt that is close in length can still be incorrect if the pulley groove width, section, or adjustment range does not match.

When This Part Needs Replacement

Replace the V-belt if it is cracked, glazed, frayed, oil-soaked, stretched, squealing, slipping, or showing uneven wear. Belt replacement is also recommended when servicing related pulleys, alternator brackets, tensioning hardware, or cooling-system drive components.

Installation Notes

Inspect all pulleys before installing the new belt. Check for rust, sharp edges, wobble, misalignment, or worn pulley grooves. Install the belt with proper tension according to the service manual and recheck alignment after tensioning. Do not force a belt over pulleys with tools, as this can damage the belt cords.

Alternate/Superseded Part Numbers

• 25-9470
• 9470
• Gates 9470
• Gates 87019470
• NAPA 25-9470
• NAPA 17470
• Dayco 17470
• Goodyear 17470
• 13A1195
• Related MerCruiser cross-reference: 960470

Parts Desk Insight

The key detail with this belt is matching the full belt profile, not just the length. A 47-inch belt can still be wrong if the top width, V-section, pulley groove, or adjustment range is different, so checking the old belt number and pulley layout is the safest way to confirm fitment.

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