Mercury - Lower Unit Seal Kit - 26-33144A2
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The Mercury Quicksilver Gear Housing Lower Unit Seal Kit 26-33144A2 is an OEM-style resealing kit for select legacy MerCruiser lower gearcase assemblies. This kit includes the seals, O-rings, and gaskets commonly required to reseal the lower unit, helping keep gear lubricant inside the gear housing while preventing water intrusion.
Key Features
- Genuine Mercury/Quicksilver lower unit seal kit
- Part number: 26-33144A2
- Also referenced as 33144A2
- Lower gear housing seal maintenance kit
- Includes required oil seals, O-rings, and related gaskets for lower gearcase reseal service
- GTIN / UPC: 745061079359
- Helps repair pressure-test leaks and water-contaminated gear lube issues
Drive Compatibility
Fits select vintage MerCruiser IA, IB, IC, EZ Shift, MC-I, R, MR, and Alpha One Generation 1 stern drives, commonly used from 1963 through 1990 applications. Supports applicable drive serial-number ranges from 164188 and up.
Serial Number Fitment Notice
Verify fitment by drive serial number and lower gear housing diagram before ordering. This kit is for legacy MerCruiser lower units and does not apply to every Alpha-style drive generation.
When This Part Needs Replacement
Use this kit when resealing the lower gearcase, repairing a pressure or vacuum leak, servicing water-contaminated gear oil, replacing prop shaft or driveshaft seals, or rebuilding the lower housing during teardown.
Installation Notes
Lower gearcase reseal service requires proper disassembly, seal removal tools, correct seal drivers, and pressure/vacuum testing after reassembly. Inspect shafts, bearing carrier surfaces, seal bores, drain/fill screw gaskets, and gear lube condition during service.
Alternate/Superseded Part Numbers
Supersedes Mercury 26-33144A1 and 26-89238A1. Primary references: 26-33144A2 and 33144A2. Common aftermarket interchanges include Sierra Marine 18-2652 and GLM Marine 87510.
Parts Desk Insight
A lower-unit seal kit is the better choice when the drive has multiple leak points or failed a pressure test. Replacing one visible seal may not fix hidden leaks, so a full reseal kit can save repeat teardown time.
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.