6413A1 Mercury Bearing Housing | Genuine Used Part

🔧 Product Description

Genuine Mercury Upper Crankshaft Bearing Housing Assembly - Part Number: 6413A1

A genuine Mercury upper crankshaft bearing housing and powerhead end-cap assembly for selected 7.5HP and 9.8HP two-cylinder outboards.

The housing supports and locates the upper crankshaft bearing while retaining the associated oil seal, O-ring and bearing components at the top of the crankcase.

The casting and assembly may also be identified by the formatted Mercury number 1164-6413A1.

⚙️ Key Features

• Genuine Mercury OEM upper bearing housing
• Correct assembly part number 6413A1
• Formatted Mercury reference 1164-6413A1
• Replaces earlier bearing housings 6110A1 and 5279A1
• Used on selected 7.5HP and 9.8HP twin-cylinder outboards

🚤 Compatibility

Commonly used on

• Mercury and Mariner twin-cylinder powerhead upper-bearing assemblies
• 7.5HP and 9.8HP crankcase end-cap applications

Typically suits

• Engine models:
• Mercury 7.5HP two-cylinder outboard
• Mariner 7.5HP two-cylinder outboard
• Mercury 9.8HP two-cylinder outboard
• Mariner 9.8HP two-cylinder outboard
• Mercury 9.8HP - serial 9165303 to 9217755
• Mercury 9.8HP - serial 9217756 and above
• Powerheads previously using bearing housing 5279A1 or 6110A1
• HP Range: 7.5HP - 9.8HP
• Engine Type: Mercury / Mariner twin-cylinder carburetted two-stroke outboard
• Year Range: Approximately late 1960s - mid-1980s

🔌 Function

The housing locates the upper crankshaft bearing, controls crankshaft alignment and seals the upper end of the crankcase.

⚠️ Common Signs of Failure

• Bearing bore worn or loose
• Housing cracked around the mounting holes
• Upper crankshaft oil leakage
• Excessive crankshaft movement or vibration
• Corrosion around the seal or bearing seat

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 6413A1 → Supersedes 6110A1
• 6413A1 → Also replaces 5279A1
• 6110A1 and 5279A1 earlier upper-bearing housing references

OEM / Related Numbers

• 6413A1
• 1164-6413A1
• 11646413A1
• 6110A1
• 5279A1
• 30-72961 related upper crankshaft bearing
• 30-20861 earlier bearing reference
• 31-31410 related bearing roller
• 26-66301 related upper oil seal
• 25-20863 related housing O-ring
• 15-31412A1 related bearing shim set

Aftermarket / Verified Equivalents

• No aftermarket equivalent

📦 Condition

• Genuine used part
• Removed from running engine where applicable
• In good working condition unless otherwise stated