Mercury Quicksilver Driveshaft Housing Plug 64649 | 19-64649
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Mercury / Quicksilver OEM Driveshaft Housing Plug — Part No. 64649 / 19-64649
| Part Number | 64649 / 19-64649 |
|---|---|
| Brand | Mercury Marine / Quicksilver |
| Product Type | Driveshaft Housing Plug (Plastic) |
| Sold As | Individually |
| UPC / GTIN | 745061166905 |
| System | Driveshaft Housing |
About This Part
The 64649 / 19-64649 is a genuine Mercury Marine / Quicksilver OEM plastic plug designed to seal the driveshaft housing. Depending on the engine configuration, it plugs the trim-tab screw hole or the water-pickup hole in the driveshaft housing. It is a small but critical piece — a missing or damaged plug leaves an intended housing opening exposed to water ingestion and debris.
Compatible Applications
Refer to the driveshaft-housing diagram for your exact engine serial number. Mercury parts catalogs list 64649 across a wide range of outboard driveshaft-housing assemblies, including selected:
- 35 HP
- 45 HP
- 80 HP
- 105 HP
- 115 HP
- 135 HP
- 150 HP (V135 configuration)
Important: Mercury used multiple driveshaft housing designs across production ranges. The plug's location and description (trim-tab screw-hole plug vs. water-pickup plug vs. driveshaft-housing plug) varies between housings. Always confirm 64649 in your engine's serial-specific parts diagram before ordering — the OEM part number is the strongest fitment reference.
When to Replace
- Plug is missing from the housing
- Cracked, split, or distorted plastic
- Loose fit — no longer seating securely
- Damaged during lower-unit or driveshaft-housing service
- Deteriorated from age or impact
Installation Notes
- Clean the plug opening and remove any corrosion or debris before installation
- Inspect the surrounding housing for cracks or damage
- Seat the plug fully and squarely — avoid cocking or over-pressing the plastic
- Do not substitute a visually similar plug based on outer diameter alone; confirm the OEM part number
Cross-Reference / Alternate Part Numbers
- 64649 (primary SKU)
- 19-64649 (Mercury-prefixed number)
- 646491 — oyster-coloured variant used on select older applications
Parts Desk Insights
This plug is one of the most commonly misidentified small parts on older Mercury outboards — its description changes between housings (trim-tab screw-hole plug, water-pickup-hole plug, driveshaft-housing plug). The safest approach is to locate 64649 directly in your engine's serial-specific parts diagram rather than relying on the description alone. If your diagram shows 646491, that is the oyster-coloured predecessor used on some earlier housings; confirm which number appears in your specific diagram before ordering.
Shipping information
In-stock and OEM parts: ship same or next business day.
Available items are ready for pickup or shipping between one and three 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.