Forward Gear Bearing – Fits Yamaha 150-225 HP, Mercury/Mariner 135-200 HP (Replaces 93332-000V3-00, 31-78172A1)
Forward Gear Bearing – Fits Yamaha 150-225 HP, Mercury/Mariner 135-200 HP (Replaces 93332-000V3-00, 31-78172A1) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
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Forward Gear Bearing – Fits Yamaha 150-225 HP, Mercury/Mariner 135-...
Product Details
This aftermarket Forward Gear Bearing – Fits Yamaha 150-225 HP, Mercury/Mariner 135-200 HP (Replaces 93332-000V3-00, 31-78172A1) is designed for standard rotation lower units. It fits a wide range of Yamaha V6 2.6 liter outboards (150HP to 225HP) from 1984 to current, including both 2-Stroke and 4-Stroke models. It also fits Mercury and Mariner V6 2.0L, 2.4L, and 2.5L outboards (135HP to 200HP) from 1979 to current.
This component is a direct replacement for Yamaha part number 93332-000V3-00 and Mercury/Mariner part number 31-78172A1.
- Product Type: Tapered Roller Bearing (#32)
- Installation: Standard Rotation Lower Unit
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Yamaha | 93332-000V3-00 |
| Mercury/Mariner | 31-78172A1 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Yamaha models, this bearing fits various 2.6L V6 engines from 1984–current as well as select 4-stroke models. Please verify your specific model and year.
For Mercury/Mariner models, this part is compatible with V6 engines from 1979–current across 2.0L, 2.4L, and 2.5L displacements.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | 150ETXK | 150 | 2-Stroke | 1985 | 93332-000V3-00 | Lower Drive 1 |
| Yamaha | 150ETXN | 150 | 2-Stroke | 1984 | 93332-000V3-00 | Lower Drive 1 |
| Yamaha | 150ETXDA | 150 | 2-Stroke | 1990 | 93332-000V3-00 | Lower Drive 1 |
| Yamaha | 150TLRR | 150 | 2-Stroke | 1993 | 93332-000V3-00 | Lower Drive 1 |
| Yamaha | 150ETLK | 150 | 2-Stroke | 1985 | 93332-000V3-00 | Lower Drive 1 |
| Yamaha | 150TLRP | 150 | 2-Stroke | 1991 | 93332-000V3-00 | Lower Drive 1 |
| Yamaha | 150TLRQ | 150 | 2-Stroke | 1992 | 93332-000V3-00 | Lower Drive 1 |
| Yamaha | PROV150L series | 150 | 2-Stroke | 1986–1990 | 93332-000V3-00 | Multiple models including PROV150LJ, PROV150LG, PROV150LH, PROV150LF, PROV150LDA |
| Yamaha | 175 series | 175 | 2-Stroke | 1984–1993 | 93332-000V3-00 | Multiple models including ETXK, ETXN, ETXDA, TLRR, TXRR, TLRQ |
| Yamaha | 200 series | 200 | 2-Stroke | 1984–1993 | 93332-000V3-00 | Multiple models including ETLH, ETLDA, TLRR, ETXF, TLRQ |
| Yamaha | 225 series | 225 | 2-Stroke | 1987–1993 | 93332-000V3-00 | Multiple models including V6EXCELXF, TLRR, V6EXCELLH, TLRQ |
| Yamaha | F150 | 150 | 4-Stroke | 2004–2020 | 93332-000V3-00 | |
| Yamaha | F175 | 175 | 4-Stroke | 2014–2020 | 93332-000V3-00 | |
| Yamaha | F200 | 200 | 4-Stroke | 2012–2020 | 93332-000V3-00 | |
| Mercury/Mariner | V6 | 135 | 2-Stroke | 1979-Current | 31-78172A1 | 2.0L, 2.4L, 2.5L engines |
| Mercury/Mariner | V6 | 150 | 2-Stroke | 1979-Current | 31-78172A1 | 2.0L, 2.4L, 2.5L engines |
| Mercury/Mariner | V6 | 175 | 2-Stroke | 1979-Current | 31-78172A1 | 2.0L, 2.4L, 2.5L engines |
| Mercury/Mariner | V6 | 200 | 2-Stroke | 1979-Current | 31-78172A1 | 2.0L, 2.4L, 2.5L engines |
Technical Specs
- Product Type
- Forward Gear Tapered Roller Bearing
- Installation
- Standard Rotation Lower Unit
- Outside Diameter
- 90.0 mm (3.543 in)
- Material
- Metal
- Weight
- 0.45 kg (1 lb)
- Bearing Type
- Tapered Roller Bearing (#32)
What’s in the Box
- 1 x Forward Gear Tapered Roller Bearing
Installation Notes
- Drain the gearcase oil completely into a suitable container.
- Remove the propeller assembly.
- Unbolt and carefully lower the gearcase from the outboard's midsection.
- Disassemble the lower unit to access the driveshaft and forward gear assembly. This may require specialized tools.
- Use a bearing press to remove the old forward gear bearing from its housing.
- Clean the housing thoroughly and inspect for any damage or wear.
- Using a press, install the new bearing until it is properly seated and oriented.
- Reassemble the gearcase components in reverse order, applying appropriate waterproof grease and sealant as required.
- Reinstall the lower unit, tighten all bolts to the manufacturer-specified torque, and refill the gearcase with fresh gear lube before operation.
Troubleshooting & FAQ
How do I know if this bearing fits my specific engine?
This bearing fits specific Yamaha V6 (150-225HP) and Mercury/Mariner V6 (135-200HP) lower units. The best way to confirm is by matching your original part number to 93332-000V3-00 (Yamaha) or 31-78172A1 (Mercury/Mariner). Also, check the compatibility tables on this page against your engine's model and year.
What tools are needed for installation?
Installation requires standard mechanic's tools as well as specialized equipment like a bearing press and puller, and a dial indicator for checking gear backlash. Due to the complexity, professional installation is highly recommended for safety and proper function.
Can I install this in a counter-rotation lower unit?
No. This bearing is specified for standard rotation lower units only. Using it in a counter-rotation (left-hand) gearcase can lead to premature failure and significant gearcase damage.
What are the signs of a failing forward gear bearing?
Common symptoms include a grinding or whining noise from the lower unit that changes with speed, excessive metal shavings on the gear oil drain plug magnet, or difficulty shifting into forward gear. These signs warrant an immediate inspection by a qualified technician.
How often should this bearing be replaced?
There is no fixed replacement interval. The bearing should be inspected for noise, roughness, or signs of wear whenever the lower unit is serviced for other reasons (e.g., water pump replacement) or if any symptoms of failure appear.
Is this an OEM part or an aftermarket one?
This listing is for an aftermarket replacement, not an OEM part. It has been manufactured to meet or exceed OEM-level specifications with comparable materials in an ISO 9002 facility and is batch-inspected for quality and consistency.
What are the shipping speed and costs?
We ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free to most locations, with expedited options available at checkout where applicable.
What is the warranty and return policy?
This part is covered by a 1-year warranty against manufacturing defects under normal use. Should an issue arise, contact our support team with your order details. Returns are accepted within our standard window for unused items in their original condition. Please see our full policy page or reach out for instructions.
Safety & Important Info
- Verify images and specifications against your original part before purchasing. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement component, not an OEM part. All mentions of brand names and part numbers are for reference purposes only.
- Professional installation is strongly recommended for the safety and performance of your marine engine. Improper installation can lead to component failure and engine damage.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and rigorously tested for real-world conditions.
- Fast Global Fulfillment — We offer free standard delivery to most regions, with typical transit times of just 5–15 days.
- Manufacturer-Direct Value — By working directly with manufacturers, we provide fair pricing without compromising on materials or quality control.
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