Mercury MerCruiser - Tapered Roller Bearing Assembly - 31-32573A1
Free returns on all eligible orders
You have 30 days to request a return. All sale items are final sale.
The Mercury MerCruiser Quicksilver Tapered Roller Bearing Assembly 31-32573A1 is an OEM upper gearcase bearing component used in compatible MerCruiser sterndrive assemblies. This bearing supports and stabilizes the driven gear inside the upper drive shaft housing, helping maintain proper gear alignment under load.
Key Features
- Genuine Mercury/Quicksilver tapered roller bearing assembly
- Part number: 31-32573A1
- Also referenced as 32573A1
- Upper gearcase driven gear bearing assembly
- Supports gear alignment and high-load rotation
- GTIN / UPC: 745061135833
- Common typo references include 321573A and 321573A1
Drive Compatibility
Fits select MerCruiser #1, R, MR, Alpha One, and Alpha One Generation II sterndrive models. Commonly associated with 1.50:1 and 1.47:1 gear ratio applications.
Serial Number Fitment Notice
Verify fitment by drive serial number, gear ratio, upper gearcase diagram, and original bearing part number before ordering. Bearing fitment can vary by drive generation, gear ratio, shaft configuration, and upper housing design.
When This Part Needs Replacement
Replace this bearing if it is noisy, pitted, scored, loose, overheated, contaminated by water intrusion, or damaged during upper gearcase disassembly. It should also be inspected during gearset, seal, shaft, or upper housing service.
Installation Notes
Installation requires upper gearcase disassembly, correct bearing tools, and proper preload/contact-pattern setup. Inspect the gearset, bearing race, shims, seals, and lubricant condition during service. Always pressure-test the drive after reassembly.
Alternate/Superseded Part Numbers
Primary Mercury references: 31-32573A1 and 32573A1. Common catalog typo references include 321573A and 321573A1. Common aftermarket interchange: Sterndrive Engineering / SEI 93-102-03.
Parts Desk Insight
Upper gearcase bearings must match the drive generation and gear ratio. A bearing that looks correct on the bench can still be wrong for the gearset, so checking the serial number and ratio before teardown saves time and protects the new parts.
Shipping: Ships same or next day for fast Canada wide shipping. ⚓
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
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
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.
To qualify for a return:
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.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.