Gates K040317SF Serpentine Belt - Air Conditioning

Gates K040317SF Stretch Fit Belt Overview

The Gates Premium OE Stretch Fit Micro-V Belt, part number K040317SF, is built for accessory drive systems that use a stretch-fit design instead of a conventional tensioner. It is a 4-rib automotive V-ribbed belt made with EPDM and nylon cord construction for the Subaru WRX, WRX STI, Impreza, Forester, and Outback applications listed below.

Gates’ Micro-V Stretch Fit belt line is focused on OE-style service for unique stretch-fit drive systems, with self-tensioning behavior that helps the belt seat correctly when installed with the proper tool. This K040317SF belt is an OE Exact / OE Performance replacement for the specified Subaru air conditioning applications.

Key Features

• Part number: K040317SF
• Premium OE Stretch Fit Micro-V Belt for stretch-fit accessory drives
• 4-rib, K-section automotive V-ribbed belt
• EPDM belt material with nylon cord reinforcement
• Effective length: 31.73 in. / 806 mm
• Outside circumference: 32.25 in. / 820 mm
• OE comparison rating: OE Exact and OE Performance
• Special installation tool required
• Instruction sheet H referenced by the manufacturer

Detailed Description

The Gates K040317SF is a stretch-fit serpentine belt for Subaru air conditioning drive applications that use a non-adjustable belt system. Its EPDM construction is selected for durability in accessory drive service, while the nylon cord material supports the belt’s stretch-fit design. For shoppers searching for a Subaru WRX STI A/C belt, Subaru WRX accessory belt, or Subaru Forester stretch fit Micro-V belt, this part number matches the listed OE-style applications.

This Gates Premium OE Stretch Fit Micro-V Belt is intended for direct replacement on the specified Subaru models and positions. It cross-references Continental 4040317S and Dayco E040318 for the same application.

Vehicle Fitment

• Fits 2013-2021 Subaru WRX STI, Air Conditioning. Installation tool required for proper fitment; Premium OE Stretch Fit Micro-V Belt.
• Fits 2012-2016 Subaru WRX, Air Conditioning. Installation tool required for proper fitment; Premium OE Stretch Fit Micro-V Belt.
• Fits 2008-2014 Subaru Impreza, Air Conditioning. Installation tool required for proper fitment; Premium OE Stretch Fit Micro-V Belt.
• Fits 2009-2013 Subaru Forester, Air Conditioning. Installation tool required for proper fitment; Premium OE Stretch Fit Micro-V Belt.
• Fits 2008-2011 Subaru Outback, Air Conditioning. Fitment: VIN 4th Digit G - Installation Tool Required; Premium OE Stretch Fit Micro-V Belt.

What It Helps Address

• Cracked or worn Subaru A/C drive belt material
• Belt noise from an aged stretch-fit accessory belt
• Improper belt fit on a non-adjustable drive system
• Loss of accessory drive performance from belt wear
• Service replacement for OE-style Subaru stretch-fit applications

Installation Notes and Tips

Use the specified special installation tool for proper fitment on stretch-fit systems. Follow instruction sheet H and verify the vehicle application before installation, especially on 2008-2011 Subaru Outback models with VIN 4th digit G. Because this is a stretch-fit belt, correct installation procedure is important for seating and service life.

Quality Assurance

Gates designs the Micro-V Stretch Fit belt line for OE-style service on unique stretch-fit drive systems, with coverage aimed at applications that require precise belt fitment. The K040317SF is listed as an OE Exact and OE Performance replacement for the specified Subaru vehicles.