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  • Mercruiser Alpha One Replacement Upper Unit 1.81 w/ Short Yoke

Mercruiser Alpha One Replacement Upper Unit 1.81 w/ Short Yoke

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    Product Description

    Sterndrive Engineering Mercruiser Alpha One Replacement Upper Unit 1.81 Ratio w/ Short Yoke

    • 1.81 ratio also replaces the 1.84 ratio
    • Comes with an [old style] 8-1/8" input yoke.
    • This drive is generally used on older inline 6 and 4 cylinder engines.
    • For Alpha One Gen I Sterndrives 1972-1990.
    • 3 Year Manufacturer's Warranty


    • Model: 470
      • Year Range: 1976-1982
      • Serial Range: 4208730-6225576
    • Model: 485
      • Year Range: 1980-1982
      • Serial Range: 4893835 and up

    OE#: 5523A67

    Item is subject to a 20% restocking fee (Boat Covers, Bimini Tops, Outdrives, Drop Ship Items and Special Order Parts)!

    How to Install Sterndrive Engineering Short Yoke

    • First, determine the length of your yoke. Newer styles are 9-9/16" and older styles are 8-1/8". Remove the clips that hold the u-joint together. You can use a screwdriver to push on it to make removing the slips easier. You may need to use the screwdriver on both sides.
    • After the clips are out, use a hammer to tap the u-joint in one direction until you can remove the cup on the opposite side. Use a suitable socket so you do not hit the yoke with the hammer. If the seal is stuck to the u-joint, use a small pick or screwdriver to remove it.
    • Using a socket of the appropriate size, pound the u-joint in the other direction. The purpose of the socket is so that you don't hit the u-joint post with a hammer. The socket should fit over the post and contact the body of the u-joint before the post.
    • With the yoke out of the way, you can start reassembly. Install both u-joint clips and the u-joint and check to make sure they rotate smoothly. If everything looks good, take them off. If you're experiencing rough rotation, your u-joint will most likely need to be replaced.
    • Install the yoke over the posts of the u-joint then insert both u-joint clips while centering the yoke.
    • Tap the u-joint together. You may be able to tap one side in all the way and put the clip in, or you may need to tap each side in a little bit at a time.
    • With both clips in, turn the yoke and see if it turns okay. If it is stiff, try hitting the opposite side.
    • You will need to grease the u-joints using a grease gun and grease that is approved for u-joints.

    pdficon.png Click Here to Download Short Yoke Installation Instructions

    California Residents: WARNING Cancer and Reproductive Harm -

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