31-8M0104358 Mercury MerCruiser Bearing Assembly | Genuine Quicksilver OEM Part

🔧 Product Description

Genuine Quicksilver Bravo Drive Gear Bearing Assembly - Part Number: 31-8M0104358

A genuine Quicksilver tapered roller bearing assembly for MerCruiser Bravo drive shaft housings. This bearing assembly is used in Bravo I, Bravo II, Bravo III, Bravo X and Bravo XR sterndrive upper / drive gear bearing applications.

⚙️ Key Features

• Genuine Quicksilver OEM bearing assembly

• Correct Mercury part number 31-8M0104358

• Tapered roller bearing assembly

• Includes roller bearing assembly and outer races where supplied

• Used on MerCruiser Bravo I, II, III, X and XR drive shaft housings

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 31-8M0104358 → Supersedes / replaces 31-86763A04 in applicable Bravo X bearing kit listings

• 31-86763A04 earlier / related Bravo bearing kit reference

OEM / Related Numbers:

• 31-8M0104358

• 8M0104358

• 31-86763A04

• 86763A04

• 31-861792 related thrust bearing

• 31-861791 related race

• 26-16709A2 related Bravo driveshaft housing seal kit

Aftermarket / Verified Equivalents:

• No direct aftermarket equivalent preferred over OEM for Bravo drive gear bearing service

🚤 Compatibility

Commonly used on:

• MerCruiser Bravo drive shaft housing bearing applications

Typically suits:

• Drive models:

• MerCruiser Bravo One drive shaft housing applications

• MerCruiser Bravo Two drive shaft housing applications

• MerCruiser Bravo Three drive shaft housing applications

• MerCruiser Bravo X One drive shaft housing applications

• MerCruiser Bravo X Two drive shaft housing applications

• MerCruiser Bravo X Three drive shaft housing applications

• MerCruiser Bravo XR drive shaft housing applications

• MerCruiser Bravo upper drive gear bearing applications where 31-8M0104358 is specified

• Drive Type: MerCruiser Bravo I / II / III / X / XR

• System Type: Drive shaft housing / upper drive gear tapered roller bearing assembly

🔌 Function

The bearing assembly supports the rotating drive gear and shaft inside the Bravo drive shaft housing, maintaining alignment and load support under propeller thrust and engine torque.

Common signs of failure:

• Upper drive noise or growling

• Metal contamination in drive oil

• Gear lash or bearing preload issues

• Vibration under load

• Bearing replacement required during upper housing rebuild

📦 Condition

• Genuine Quicksilver part

• Brand new

• Supplied in original or equivalent packaging