Pulley Kit F/ Yanmar 2Gm20-F, 3Gm30-F, 3Gm-F
Balmar
Pulley Kit F/ Yanmar 2Gm20-F, 3Gm30-F, 3Gm-F
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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.
SIZES & DIMENSIONS
WHAT'S IN THE BOX
FEATURES
FEATURES
SPECIFICATIONS
SPECIFICATIONS
DOCUMENTATIONS
SHIPPING & DELIVERY
- Free shipping on orders over RM300 (West Malaysia only)
- Delivery time: West Malaysia 2–5 business days · East Malaysia 3–10 business days · Singapore 5–14 business days
- Processing time: Orders are processed Mon–Fri (excl. public holidays); allow 1–2 business days before dispatch
- We ship to: All states in Malaysia and Singapore (international shipping not yet available)
- Store pickup available at our Klang showroom — you'll be notified by email/SMS when your order is ready
- Pre-order items typically take 4–6 weeks depending on supplier and customs timelines
- Tracking: A tracking number is sent via email/SMS once your order ships
For full details, please refer to our Shipping Policy.
RETURNS & REFUNDS
- Report within 48 hours of receiving your order if the item is damaged, defective, or incorrect
- Eligible returns: Item must be unused, in original packaging, with photo/video evidence provided
- Not eligible: Pre-order items, misuse/negligence damage, and clearance/sale items (unless defective)
- Refunds: Issued as store credit by default (or original payment method); processed in 7–14 business days after inspection
- Exchanges: Available for defective or incorrect items, subject to stock availability
- Return shipping is the customer's responsibility — use a trackable courier
- To start a return, contact us with your order number and photos: info@boatyardmalaysia.com / +60 19-201 8832
For full details, please refer to our Return & Refund Policy.