Sierra Oil Drain Screw – 1236 (47-1236)
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Sierra Oil Drain Screw – Part No. 1236 (SKU: 47-1236)
The Sierra 1236 Oil Drain Screw is an OEM-quality replacement drain screw for lower unit and gearcase oil service on Cobra-style sterndrive and compatible outboard applications. Designed to restore a secure, leak-free drain point during scheduled gearcase oil changes.
Part Information
- Part Number: 1236
- SKU: 47-1236
- Brand: Sierra
- Official Product Type: Gearcase Service Hardware
- System: Lower Unit / Gearcase Lubrication
Compatible Applications
- OMC Cobra sterndrive lower units requiring a drain screw replacement
- Compatible outboard gearcases using the same drain screw spec — verify thread pitch and head style against your existing screw before ordering
Service Interval
- Replace or inspect at every gearcase oil change (typically every 100 hours or annually, per your engine manufacturer's schedule)
- Replace immediately if screw shows stripped threads, corrosion, or a damaged seating surface
Technical Notes
- Always replace the drain screw gasket or O-ring (if used in your application) at the same time as the screw — reusing a worn seal is a leading cause of gearcase oil leaks at the drain point
- Torque to manufacturer specification — overtightening will strip aluminum gearcase threads
- Confirm thread pitch and head style match your existing screw before installation
Parts Desk Insights
Best Use: This screw is the go-to replacement when a drain screw is stripped, corroded, or leaking at the seat. Most commonly used during gearcase oil service on Cobra-style drives.
Common Issues: Customers frequently order this screw without replacing the mating gasket — a copper or fiber sealing washer that is often the actual source of a slow drip at the drain point. We recommend ordering Sierra Oil Drain Screw Gasket 47-4698 at the same time to complete the service correctly.
Related Parts
- Sierra Oil Drain Screw Gasket – 47-4698 — Matching drain screw sealing gasket; replace with every oil change
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 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.