Pulley Kit F/ Yanmar 2Gm20-F, 3Gm30-F, 3Gm-F

These pulley kits by Balmar offer the opportunity to install a larger alternator than would otherwise be possible; this kit is for the Yanmar 2GM20-F, 3GM30-F, and 3GM-F.   The F stands for fresh water cooled. Alternator upgrades using a single drive belt are limited by the amount of power that can be transferred by the belt but using a multi grooved belt considerably increases the possibilities. The kits include a set of serpentine pulleys for the crankshaft, water pump pulley and alternator. This pulley kit comes with two belts so you have a spare, the alternators need to be purchased separately. If you order an alternator at the same time as the kit it will come with the appropriate pulley pre-installed. 

• Kit includes three ten groove J10 pulleys
• Includes also two 40" circumference J10 belts and mounting hardware.
• See the Additional Information tab for more about belts.
• Instruction sheet
• Read my Blog Post about installing one of these kits.
• Please check your engine model number carefully to ensure you are ordering the correct kit.  The 3GM30 is quite different from the 3GM30-F and they frequently get mixed up.