Mercury - Driveshaft Oil Seal - 26-804156
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You have 30 days to request a return. All sale items are final sale.
The Mercury Quicksilver Driveshaft / Oil Seal 26-804156 is an OEM-style radial shaft oil seal used in select Mercury, Mariner, and MerCruiser gearcase or powertrain applications. It seals around rotating shaft surfaces to help retain oil or gear lubricant while helping prevent water intrusion into the assembly.
Key Features
- Genuine Mercury/Quicksilver oil seal
- Part number: 26-804156
- Also referenced as 804156
- Radial shaft oil seal for compatible gearcase or powerhead applications
- Helps retain oil while sealing against water and contamination
- GTIN / UPC: 745061204156
- Often stocked in multi-pack service quantities for repair work
Engine Compatibility
Used on select Mercury and Mariner outboard applications, including various 2-stroke carbureted, Laser, EFI, XR4, and Magnum II engine families from roughly 35 HP through 200 HP. Also used in select MerCruiser applications, including Vazer-related powertrain assemblies where this seal is shown in the parts diagram.
Serial Number Fitment Notice
Verify fitment by engine or drive serial number, gearcase diagram, seal location, and original part number before ordering. Oil seals can vary by shaft diameter, housing bore, installation depth, and gearcase or powerhead configuration.
When This Part Needs Replacement
Replace this seal if oil or gear lube is leaking, water is entering the housing, the seal lip is worn or hardened, the garter spring is damaged, or the seal is disturbed during rebuild or shaft service.
Installation Notes
Inspect the shaft sealing surface before installing the new seal. Grooved, corroded, or pitted shafts can damage the new seal and cause repeat leaks. Install squarely with the correct driver and pressure-test the gearcase where applicable.
Alternate/Superseded Part Numbers
Primary Mercury references: 26-804156 and 804156.
Parts Desk Insight
Oil seals are location-specific parts. Matching the outside diameter is not enough—the shaft size, lip direction, and installation depth all need to match the Mercury diagram for the seal to work properly.
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.