9731640Q4 Mercury MerCruiser Anode trim tab | Genuine Quicksilver OEM Part

🔧 Product Description

Genuine Quicksilver Aluminium Trim Tab Anode - Part Number: 97-31640Q4

A genuine Quicksilver cast-aluminium trim-tab anode for selected Mercury and Mariner outboards and MerCruiser sterndrives.

The finned tab provides sacrificial corrosion protection for underwater aluminium components while allowing steering torque caused by propeller rotation to be corrected through tab adjustment.

⚙️ Key Features

• Genuine Quicksilver OEM aluminium anode

• Correct Mercury part number 97-31640Q4

• Finned trim-tab design

• Suitable for freshwater, brackish-water and saltwater use

• Martyr, GLM and aftermarket equivalents available

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 97-31640Q4 current aluminium trim-tab reference

• 31640 earlier trim-tab family reference

OEM / Related Numbers:

• 97-31640Q4

• 31640Q4

• 9731640Q4

• 316404

• 316406

• 31640A4

• 31640B4

• 31640Q03

• 31640T4

• 31640T6

• 822777Q1

• 822777A1

• 72436A1

• UPC: 745061040359

Aftermarket / Verified Equivalents:

• Martyr: CM31640KIT

• GLM: 12710

• Aftermarket: 31640 aluminium trim-tab anode

• Honda Marine: 41107-ZW1-003

• OMC / Johnson / Evinrude: 0509460

🚤 Compatibility

Commonly used on:

• Mercury and Mariner outboard anti-ventilation plates

• MerCruiser Alpha and earlier sterndrive gear housings

Typically suits:

• Engine / drive models:

• Most Mercury and Mariner outboards 35HP and above

• Mercury 40HP through 300HP gearcases with the matching trim-tab mounting pattern

• MerCruiser MC-I, R and MR sterndrives

• MerCruiser Alpha One - 1983-1990

• MerCruiser Alpha One Gen II - 1991 and above

• MerCruiser sterndrives except Bravo-series drives

• Applications requiring additional propeller clearance beneath the anti-ventilation plate

• HP Range: 35HP - 300HP for applicable outboards

• Drive Type: MerCruiser pre-Alpha, Alpha One and Alpha One Gen II

• Material: Cast aluminium sacrificial alloy

🔌 Function

The anode corrodes preferentially to protect the gear housing and other submerged aluminium components, while the adjustable fin helps offset propeller steering torque.

Common signs replacement is required:

• Anode has lost approximately half its original material

• Surface is deeply pitted or crumbling

• Steering torque increases because the tab has moved

• Mounting bolt is loose or corroded

• Anode is painted or electrically isolated from the gearcase

📦 Condition

• Genuine Quicksilver part

• Brand new

• Supplied in original or equivalent packaging