Mercury - Gearcase Shim Set - 15-32563A1
Free returns on all eligible orders
You have 30 days to request a return. All sale items are final sale.
The Mercury Quicksilver Gearcase Shim Set 15-32563A1 is an OEM shim kit used to set correct drive shaft bearing position and gearcase preload in compatible MerCruiser drive shaft housing assemblies. These precision shims allow fine adjustment during upper gearcase service, helping establish proper bearing setup, pinion depth, and gear contact pattern.
Key Features
- Genuine Mercury/Quicksilver gearcase shim set
- Part number: 15-32563A1
- Also referenced as 32563A1
- Drive shaft housing top cover bearing shim kit
- OD: 1.750"
- ID: 1.500"
- Designed for 1.7813" bore applications
- GTIN / UPC: 0745061077386
- Used for bearing preload, gear depth, and contact-pattern adjustment
Drive Compatibility
Commonly used on select MerCruiser Alpha One Generation II drive assemblies in the upper drive shaft housing / top cover bearing area.
Serial Number Fitment Notice
Verify fitment by drive serial number, upper gear housing diagram, bearing configuration, and shim location before ordering. Shim sets are application-specific and should not be substituted by diameter alone.
When This Part Needs Replacement
Use this shim set during upper gearcase rebuilds, bearing replacement, drive shaft housing service, or any repair requiring gear tooth contact pattern and bearing preload adjustment.
Installation Notes
Correct shim selection requires proper Mercury service procedures, measurement tools, and contact-pattern verification. Inspect the tapered roller bearing, bearing race, top cover, gearset, and housing bore before final assembly. Improper shim setup can cause gear noise, heat, accelerated wear, or premature gearcase failure.
Alternate/Superseded Part Numbers
Primary Mercury references: 15-32563A1 and 32563A1. Common aftermarket interchanges include Sierra Marine 18-2282 and Sterndrive Engineering / SEI 98-106-02K.
Parts Desk Insight
Shim kits are not “close enough” parts. Their job is to position the bearing and gearset precisely, so the correct kit and careful setup are what prevent noisy gears and repeat lower-unit teardown.
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.