Description

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Alternate/Superseded Part Numbers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.