Borg Warner Velvet Drive Double Ball Bearing – 71 Series | 4920A
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Borg Warner Velvet Drive Double Ball Bearing – 71 Series | Part 4920A
A direct-replacement double ball bearing for Borg Warner Velvet Drive 71 series marine transmissions. Double ball bearings in the Velvet Drive series carry both radial and axial loads on primary rotating shafts — they are precision components that maintain shaft alignment and absorb thrust forces generated during forward and reverse operation. At this price point, part 4920A is a significant bearing assembly, typically located at a primary shaft support position within the transmission. It is replaced during a full rebuild or when bearing failure is confirmed through noise, vibration, or inspection.
Part Details
- Part Number: 4920A
- Brand: Borg Warner
- Product Type: Double Ball Bearing
- Transmission Family: Velvet Drive – 71 Series
- System: Marine transmission – shaft support / load bearing
- Diagram Position: Primary shaft bearing location — refer to your Velvet Drive 71 series parts diagram for exact position
- Condition: New OEM replacement
Compatible Applications
- Borg Warner Velvet Drive 71C series marine transmissions
- Borg Warner Velvet Drive 71 series variants where part number 4920A is specified
- Marine inboard applications where 4920A appears in the transmission parts diagram
- Always confirm fitment against your transmission model number, ratio, and parts diagram before ordering — Velvet Drive bearing part numbers are position-specific
When to Replace
- During a full Velvet Drive 71 series transmission rebuild
- When the bearing shows pitting, spalling, roughness, or play on inspection
- When rumbling, grinding, or vibration is traced to the bearing location inside the transmission
- When shaft end-play or radial play exceeds service limits specified in the Velvet Drive service manual
Installation Notes
- Double ball bearing replacement requires full transmission disassembly — refer to the Velvet Drive 71 series service manual for the correct procedure and bearing press specifications
- Use the correct bearing driver or press to avoid damaging the bearing races during installation
- Inspect the bearing bore and shaft journal for wear, scoring, or out-of-round condition before installing
- Replace all seals and gaskets disturbed during disassembly — do not reuse old seals
- Verify correct bearing orientation and preload as specified in the service manual
Technical FAQ
- What does “double ball bearing” mean? A double ball bearing has two rows of ball elements, allowing it to carry both radial loads (perpendicular to the shaft) and axial/thrust loads (along the shaft axis) simultaneously — making it suitable for primary shaft positions in a marine transmission.
- How do I confirm this is the correct bearing for my transmission? Locate the model plate on your transmission, note the model number and ratio, then cross-reference part number 4920A against the Velvet Drive 71 series parts diagram for your specific unit.
- Can I replace just this bearing without a full rebuild? Accessing this bearing requires full transmission disassembly. If the transmission is already apart, replace all bearings and seals at the same time.
Related Parts
- Borg Warner Velvet Drive Needle Bearing (4840D)
- Borg Warner Velvet Drive Oil Pump – 71C / 72C Series (71C-A60)
- Borg Warner Velvet Drive Input Shaft – 71C / 72VDR Series (71C-3A16)
- Borg Warner Shift Spool O-Ring – Velvet Drive 71C / 72C (4804H)
- Crusader Damper Plate 302/351 – SAE #0 / BorgWarner (R140001)
Parts Desk Insights
The 4920A double ball bearing is a high-value precision component — at this price, it’s the kind of part that should only be ordered once the transmission is already disassembled and the bearing position has been confirmed against the parts diagram. The most common mistake is ordering a bearing by description alone without verifying the exact position number in the Velvet Drive 71 series diagram; Velvet Drive transmissions use multiple bearings of different types and sizes, and the wrong bearing will not fit correctly. If you’re doing a full rebuild, replace the needle bearings (4840D), shift spool O-ring (4804H), and inspect the oil pump (71C-A60) at the same time — the labour to access these components is the same whether you replace one part or all of them.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
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If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
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Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
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