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Sterndrive Engineering Repl Lower Unit Merc R,Mr,Alpha One

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SKU:
S-E-90-106-02.1
Availability:
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List Price: $1,109.99
Starting At: $1,049.99
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Description

Sterndrive Engineering Replacement Lower Unit Mercruiser R, MR, and Alpha One

90-106-02

  • Replaces R, MR, Alpha One lowers from 1972-1990
  • 13 Spline Driveshaft
  • Tooth count is 13-21
  • Up to 300 HP

90-108-02

  • To replace Counter Rotation units only

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

**Year, Serial Number, and Horsepower are required to order. Please contact us with this information after you place your order otherwise processing will be delayed.


Sterndrive Engineering Model Chart

Refer to Sterndrive Engineering's model chart below to find your proper Mercruiser Sterndrive Replacement. These are typical applications; it is best to confirm your ratio by couting the teeth in the upper. Although great care was taken in the creation of this guide, its accuracy cannot be guaranteed.

 Model  Year Range  Serial Range  Notes (See Below)  Standard Rotation  Counter Rotation
 120,140  1967-1969  2062141-2791956  1,2,3,4,5,6  1.94  1.94 CR
 120,140  1970-1982  2791957-6225576  2,4,5,6  1.94  1.94 CR
 160  1967-1969  2065190-2763441  1,2,3,4,5,6  1.62  1.62 CR
 165  1970-1977  2763442 and up  2,4,5,6  1.62  1.62 CR
 225-S  1974  3856268-4200499  4,5,6  1.47  1.47 CR
 233  1975-1977  4200500  4,5,6  1.47  1.47 CR
 250  1977  4791300-4898729  4,5,6  1.47  1.47 CR
 260  1978-1982  4898730-6225576  4,5,6  1.47  1.47 CR
 470  1976-1982  4208730-6225576  2,4,5,6  1.81  1.81 CR
 485  1980-1982  4893835 and up  2,4,5,6  1.81  1.81 CR
 888  1971-1977  3106717 and up  4,5,6  1.47  1.47 CR
 898/228  1977-1982  4782330-622576  4,5,6  1.47  1.47 CR
 R/MR/Alpha One  1983-1990  6225577-OD469585  6,7    

Notes:

    1. Unit has an 8 spline driveshaft on the lower unit. If your unit is original, you need to purchase a complete.
    2. Unit has a short yoke on the upper driveshaft. We refer to this as the “Old Style”
      • ***Applies to all inline 4 and inline six cylinder engines up until and including 1982***
    3. Unit must have trim and tilt for our Replacement to work. If it has two trim hoses going to each cylinder, it has trim and tilt.
    4. Unit has an eyelet on top cover. Replacement unit will not.
    5. Unit has a round cavitation plate on lower unit. Replacement unit will not.
    6. Unit may have an o-ring and/or a preload pin on lower unit driveshaft. The replacement will not.
    7. Gear Ratio must be confirmed. Chart below is typical applications, however there is no guarantee it is correct. To be safe it is best to remove the top cover and count the teeth on the upper gears.
 Engine Configuration  Horsepower  Gear Ratio  Tooth Count  Standard Rotation  Counter Rotation
 Inline 4 Cyl. 2.5L/3.0L  120,140  1.98/1.94  20/24  1.94  1.94 CR
 Inline 4 Cyl. 3.7L  170  1.84/1.81  17/19  1.81  1.81 CR
 Inline 6 Cyl.  160/165  1.65/1.62  24/24  1.62  1.62 CR
 V6 4.3L  185/190  1.84/1.81  17/19  1.81  1.81 CR
 V8 305 2 Barrel Carb.  200  1.65/1.62  24/24  1.62  1.62 CR
 V8 305/350  230/260  1.50/1.47  20/22  1.47  1.47 CR

 

 

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