8M0236553 Mercury Trim Tab | Genuine Used Part
8M0236553 Mercury Trim Tab | Genuine Used Part
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🔧 Product Description
Genuine Mercury Aluminium Trim Tab Anode - Part Number: 8M0236553
A genuine Mercury aluminium trim tab and sacrificial anode for selected Mercury and Mariner outboards and non-Bravo MerCruiser sterndrives. The shaped tab can be adjusted to counter steering torque while the aluminium body provides sacrificial corrosion protection for the gearcase.
⚙️ Key Features
- Genuine Mercury OEM aluminium trim tab anode
- Current part number 8M0236553
- Supersedes the 31640T and 31640-series references
- Provides steering-torque correction and corrosion protection
- Used on selected 35HP to 125HP outboards and non-Bravo MerCruiser drives
🚤 Compatibility
Commonly used on
- Mercury and Mariner gearcases with an adjustable trim-tab anode
- MerCruiser Alpha-family and earlier non-Bravo sterndrive lower units
- Installations with sufficient propeller clearance for the raised trim-tab profile
Typically suits
- Engine / drive models:
- Mercury / Mariner 35HP
- Mercury / Mariner 40HP
- Mercury / Mariner 45HP
- Mercury / Mariner 50HP
- Mercury / Mariner 55HP
- Mercury / Mariner 60HP
- Mercury / Mariner 65HP
- Mercury / Mariner 70HP
- Mercury / Mariner 75HP
- Mercury / Mariner 80HP
- Mercury / Mariner 90HP
- Mercury / Mariner 100HP
- Mercury / Mariner 115HP
- Mercury / Mariner 125HP
- MerCruiser MC-I, R and MR drives where 31640-series trim tab is specified
- MerCruiser Alpha One
- MerCruiser Alpha One Gen II
- Non-Bravo MerCruiser drives using the matching gearcase tab and bolt pattern
- HP Range: Commonly 35HP - 125HP for outboard applications
- Drive Type: Mercury / Mariner outboard and MerCruiser non-Bravo sterndrive
- Year Range: Approximately 1970s onward, dependent on gearcase and propeller clearance
🔌 Function
The offset fin can be rotated to reduce steering pull caused by propeller torque. The aluminium also corrodes sacrificially in preference to the gearcase, helping protect submerged aluminium components.
⚠️ Common Signs of Failure
- Tab heavily eroded or missing
- Steering pulls strongly to port or starboard
- Corrosion developing on the gearcase
- Tab contacts the propeller
- Mounting bolt seized or loose
- Fin bent, cracked or broken
🔄 Supersession & Cross Reference
OEM Supersession Chain
- 8M0236553 → Supersedes 31640T07
- 31640T07 → Supersedes 31640T5
- 31640T5 → Supersedes 97-31640T5
- 97-31640T5 → Supersedes 316405
- 316405 earlier OEM trim-tab reference
OEM / Related Numbers
- 8M0236553
- 31640T07
- 31640T5
- 97-31640T5
- 316405
- 31640Q4 Quicksilver packaged aluminium trim tab
- 97-822777A2 magnesium freshwater alternative
- 822777A2 magnesium freshwater alternative
Aftermarket / Verified Equivalents
- Quicksilver: 31640Q4 aluminium trim tab anode
- Mercury / Quicksilver: 822777A2 magnesium freshwater alternative
- Marine anode manufacturers: 31640-series aluminium replacement trim tab
📦 Condition
- Genuine used part
- Removed from running engine where applicable
- In good working condition unless otherwise stated
Shipping & Delivery
Shipping & Delivery
Flat-rate shipping Australia-wide — $14.99 per order, no matter how many parts you add. Orders dispatch from our Kadina, South Australia store. Need it urgently or want to collect in person? Call us on 0412 532 984 before ordering.
Returns & Warranty
Returns & Warranty
14-day change-of-mind returns — if it's not right or you ordered the wrong part, send it back within 14 days in the condition you received it for a refund or exchange. Full details in our Refunds & Returns policy.
Not sure this fits?
Not sure this fits?
Ask us before you buy — we check part numbers and fitment every day. Call 0412 532 984 (Mon–Fri 8.30am–4.30pm) or message us through the contact page with your engine or vehicle details.
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