Balmar Serpentine Pulley Kit for Yanmar 2GM20, 3GM30

The Balmar AltMount Serpentine Pulley Conversion Kit (Yanmar 2GM20-F, 3GM30-F, and 3GM-F) provides an easily installed solution for greater load transfer and reduced engine noise and vibration. It is designed for boaters who want a moderately simple installation process, though Balmar strongly recommends reading and following the installation instructions closely.

This kit is built for Yanmar diesel engines: Yanmar 2GM20-F, 3GM30-F, and 3GM-F. It includes three ten-groove (J10) pulleys, two J10 40" circumference serpentine belts (one spare), and mounting hardware. Note: specifying an AT-200A alternator may require a longer belt length — contact Balmar Technical Support if unsure. Browse more options in our alternators and charging hardware category.

Key Features

• Yanmar 2GM20-F
• 3GM30-F
• and 3GM-F
• 3 J10 pulleys
• 2 belts (40"
• 1 spare)
• mounting hardware
• Engines: Yanmar 2GM20-F, 3GM30-F, 3GM-F
• Pulleys: 3x Ten-Groove J10
• Belts: 2x J10, 40" Circumference (1 Spare)

Additional Details: Weight: 4 lb.

Frequently Asked Questions

What does this kit improve? Load transfer while reducing engine noise and vibration.

What Yanmar engines does this kit cover? Yanmar 2GM20-F, 3GM30-F, and 3GM-F.

How many pulleys and belts come in this kit? Three J10 pulleys and two 40" circumference serpentine belts (one spare).

This product may not be returned to the original point of purchase. Please contact the manufacturer directly with any issues or concerns.