HOLIDAY ALERT

We will be closing at 12 PM EST on Friday, April 18th, in observance of Good Friday and Easter.
Any orders placed after this time will be processed on Monday, April 21st.
Have a happy Easter weekend!

Weather Closure Alert

Due to severe weather, our White House, Tennesee location will be closed Wednesday the 19th.

All shipments from this location will resume on Thursday the 20th. Thank you for your patience!

WE WANT TO HEAR FROM YOU!

We strive to make improvements that make it easier to serve your boating needs.
We’d like to know more about you and how we can do the best job possible for you.
Please take the time to complete this brief 3-5 minute survey to help us serve you better.

FREE Ground Shipping on Orders over $100!  Exceptions apply - see details.

Toggle Nav
  • Sign In
  • Create an Account
My Cart
Search
Menu
Account
Settings
Engine Couplers

Engine Couplers

6 Items

Set Descending Direction
View as List Grid
  1. Small Image
    Cobra SX Engine Coupler | Sierra 18-21751
    SIERRA-18-21751
    Qty In Stock: 10
    Brand: Sierra
    Aftermarket coupler connects OMC & Volvo Penta GM engines to stern drives. Learn More
    MSRP: $326.09 $208.52
    Add to Wishlist
  2. Small Image
    Mercruiser Ford V8 Engine Coupler | Sierra 18-2173
    SIERRA-18-2173
    Qty In Stock: 4
    Brand: Sierra

    Sierra engine coupler bolted to the crankshaft studs on Mercruiser Ford small block V8 engines to engage the drive unit inut yoke.

    Learn More
    MSRP: $396.79 $267.56
    Add to Wishlist
  3. Small Image
    Cobra SX Engine Coupler | Sierra 18-21752-1
    SIERRA-18-21752-1
    Qty In Stock: 19
    Brand: Sierra
    Aftermarket coupler connects OMC & Volvo Penta GM V6 & V8 engines to stern drives. Learn More
    MSRP: $351.69 $224.91
    Add to Wishlist
  4. Small Image
    Engine Coupler | Sierra 18-2171
    SIERRA-18-2171
    Qty In Stock: 8
    Brand: Sierra
    Aftermarket engine coupler connects early model Mercruiser GM engines to stern drives. Learn More
    MSRP: $314.89 $240.20
    Add to Wishlist
  5. Small Image
    Mercruiser GM Pre-Vortec Engine Coupler | Sierra 18-2172
    SIERRA-18-2172
    Qty In Stock: 2
    Brand: Sierra
    Aftermarket engine coupler connects Mercruiser GM engines to stern drives. Learn More
    MSRP: $472.19 $314.51
    Add to Wishlist
  6. Small Image
    Ford Engine Coupler | Sierra 18-21753
    SIERRA-18-21753
    Qty In Stock: 9
    Brand: Sierra
    Aftermarket engine coupler connects OMC Ford small block engines to sterndrives. Learn More
    MSRP: $563.49 $360.36
    Add to Wishlist

6 Items

Set Descending Direction
View as List Grid
My Wish List
Last Added Items
  1. Add to Cart
    Remove This Item
Go to Wish List
You have no items in your wish list.
© 2025 Marine Parts Source. All Rights Reserved.