Mercury MerCruiser - Gasket - 344863
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The Mercury MerCruiser Quicksilver Distributor Base Gasket 27-344863 is an OEM-style sealing gasket used between the distributor base and engine block on compatible MerCruiser marine engines. It helps seal the distributor mounting area against oil vapor, moisture, and debris while supporting proper ignition-system installation.
Key Features
- Genuine Mercury/MerCruiser distributor base gasket
- Part number: 27-344863
- Also referenced as 344863
- Seals distributor base to engine block
- Approximate dimensions: 1.78" L x 1.78" W x 0.25" H
- Approximate weight: 0.02 lb
- UPC / GTIN: 745061137288
- Used on select GM-based marine engine distributor applications
Engine Compatibility
Fits select MerCruiser GM-based marine engines using a conventional distributor base gasket, including 3.7L / 224 inline-4 engines, 4.3L V6 engines, and select small-block and big-block V8 applications such as 5.0L, 5.7L, and 7.4L configurations.
Serial Number Fitment Notice
Verify fitment by engine serial number, distributor style, and parts diagram before ordering. Distributor gasket fitment can vary by engine family, ignition system, block design, and production range.
When This Part Needs Replacement
Replace this gasket whenever the distributor is removed, or if the gasket is torn, compressed, oil-soaked, brittle, leaking, or damaged during ignition-system service.
Installation Notes
Clean the distributor base and engine block sealing surfaces before installation. Mark distributor position before removal, avoid disturbing timing setup unnecessarily, and confirm ignition timing according to Mercury service procedures after reassembly.
Alternate/Superseded Part Numbers
Primary Mercury references: 27-344863 and 344863. Common aftermarket interchange: Sierra Marine 18-0874.
Parts Desk Insight
Distributor gaskets are simple, but they sit in a timing-sensitive area. Marking the distributor position before removal helps prevent extra ignition timing work after the gasket is replaced.
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.