Mercruiser Alpha 1 Gen 1 Complete Replacement Drive 1.50 1.47 Ratio 1974-1990

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Seller: Top-Rated Seller seimarineproducts (3,347) 99.4%, Location: Oldsmar, Florida, Ships to: Worldwide, Item: 112161039569 General Information For Selecting And Purchasing An SEI Complete Sterndrive SEI complete sterndrives are shipped in two halves. Complete SEI sterndrives do not include the assembly or mounting hardware. Kits are available in our Ebay store. Kit part number 90-106-03K includes all assembly hardware, mounting hardware, O-rings and gaskets for mounting the drive, brass intermediate shift shaft and the guide tube for the water pump. SEI drives are compatible with OEM assembly hardware and mounting gaskets and O-rings. Complete SEI sterndrives do not include new anodes / zincs. Kit part number 90-106-05K includes all anodes for a Gen 1 drive. SEI drives are compatible with OEM and other aftermarket anodes. All SEI drives and gearcases are covered by SEIs three year Fault Free warranty. The unit is covered for three years for breakage and damage; including failures resulting from lack of oil, fishing line, impact and other abuse. SEI replacement drives for Alpha I Gen I drives are available with two different input yoke lengths. Please see the image below to verify the yoke length you need. SEI 106 drives use the 9-9/16 length yoke. SEI 104 drives use the 8-18 SEI offers replacement drives for both Gen I and Gen II Alpha sterndrives. The two styles are not interchangeable. Please see the images below and compare them to your existing sterndrive to determine that you are ordering the correct style replacement sterndrive. SE106 SE116 Mercruiser Model Number to Gear Ratio Chart Replaces most Mercruiser Sterndrives from 120 -260 HP 1967-1990. Your Mercruiser Sterndrive must have trim and tilt to be able to use our replacement drive. If your Mercruiser Sterndrive is between 1967-1969‚ you must verify that you have 13 splines on your upper driveshaft. Ships in two boxes. Comes with 9 -9/16 input yoke. Does not include Complete Install Kit orAnode Kit. Please see related items below. To determine if you have a counter rotation unit on your twin engine boat it is easiest to look at the props. If the props are identical orientation, then they are both standards. If the prop blades are opposite, then the port should be a counter rotation. Please refer to the model chart below to find your proper gear ratio. This is a live link chart, when you find your application click on the link indicated in red Model Year Range Serial Range Notes See Below Complete Std. Rotation Upper All Lower Std. Rotation Complete Counter Rotation Lower Counter Rotation 120/140 1967-1969 2062141-2791956 1,2,3,4,5,6 1.94 See #1 See #1 1.94 C.R. See #1 120/140 1970-1982 2791957-6225576 2,4,5,6 1.94 1.94 Lower 1.94 C.R. Lower C.R. 160 1967-1969 2065190-2763441 1,2,3,4,5,6 1.62 See #1 See #1 1.62 C.R. See #1 165 1970-1977 2763442 and up 2,4,5,6 1.62 1.62 Lower 1.62 C.R. Lower C.R. 225 –S 1974 3856268-4200499 4,5,6 1.47 1.47 Lower 1.47 C.R. Lower C.R. 233 1975-1977 4200500 4,5,6 1.47 1.47 Lower 1.47 C.R. Lower C.R. 250 1977 4791300-4898729 4,5,6 1.47 1.47 Lower 1.47 C.R. Lower C.R. 260 1978-1982 4898730-6225576 4,5,6 1.47 1.47 Lower 1.47 C.R. Lower C.R. 470 1976-1982 4208730-6225576 2,4,5,6 1.81 1.81 Lower 1.81 C.R. Lower C.R. 485 1980-1982 4893835 and up 2,4,5,6 1.81 1.81 Lower 1.81 C.R. Lower C.R. 888 1971-1977 3106717 and up 4,5,6 1.47 1.47 Lower 1.47 C.R. Lower C.R. 898/228 1977-1982 4782330-622576 4,5,6 1.47 1.47 Lower 1.47 C.R. Lower C.R. R/MR/Alpha One 1983-1990 6225577-OD469858 6,7 R, MR, Alpha I- Typical Engine To Gear Ratio Chart To be safe, it is best to remove the top cover and count the teeth on the upper gears. This is a live link chart, when you find your application click on the link indicated in red Engine Configuration Horsepower Gear Ratio Tooth Count Complete Std. Rotation Upper All Lower Std. Rotation Complete Counter Rotation Lower Counter Rotation Inline 4 Cyl. 2.5L/3.0L 120/140 1.98/1.94 20/24 1.94 1.94 Lower 1.94 C.R. Lower C.R. Inline 4 Cyl. 3.7L 170 1.84/1.81 17/19 1.81 1.81 Lower 1.81 C.R. Lower C.R. Inline 6 cyl 160/165 1.65/1.62 24/24 1.62 1.62 Lower 1.62 C.R. Lower C.R. V6 4.3L 185/190 1.84/1.81 17/19 1.81 1.81 Lower 1.81 C.R. Lower C.R. V8 305 2 Barrel Carb. 200 1.65/1.62 24/24 1.62 1.62 Lower 1.62 C.R. Lower C.R. V8 305/350 230/260 1.50/1.47 20/22 1.47 1.47 Lower 1.47 C.R. Lower C.R. V8 454 7.4L 330 1.32*/1.29* 20/16 *We do not make this gear ratio. You could substitute a 1.47 ratio, but it would not be covered under our 3 year warranty as it is over our 300 HP Limit These are typical applications, it is best to confirm your ratio by counting the teeth in the upper. Although great care was taken in the creation of this guide, SEI cannot guarantee its accuracy. Unit has an 8 spline driveshaft on the lower unit. If your unit is original, you need to purchase a complete. 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*** 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. Unit has an eyelet on top cover. Replacement unit will not. Unit has a round cavitation plate on lower unit. Replacement unit will not. Unit may have an o-ring and/or a preload pin on lower unit driveshaft. The replacement will not. Gear Ratio must be confirmed. Chart above is typical applications, however there is no guarantee it is correct. Counter Rotation Identification If you have a twin engine boat with either SE106 or SE116 style outdrives, you may have a counter rotation unit on the port side. The easiest way is to confirm that is to look at the prop. If the directions of the blades are the same on both props then they are both standard rotation. If the directions of the blades are different then you have a counter rotation on the port side. If you currently have two standard rotation drives you can upgrade the port side to be counter rotating. There are a couple of modifications you will need to make. The first change will be changing the throw of the port shifter at the helm. You will need to remove the remote control to do this. If you are uncomfortable doing this, then seek the help of a qualified mechanic. If you are familiar with removing the drive, it is important to note that after doing this modification you will need to put the shift lever into reverse when removing or installing the drive. The other change you will need to make is getting a prop that opposite rotation. If you are lucky you can buy the exact same prop, only LH rotation. If they do not make it, you will need to buy two new props, one LH and one RH. You don’t want to put two different style props on the boat. It is important to never switch the drives between port and starboard. The drives will not handle the load. When you order a counter rotation unit from us, it will have a red tag attached to the lower. If you get the units confused, the only way to tell is by looking at the bearing carrier. You should be able to see the part number of 97-102-06 on the bearing carrier for the standard rotation in location indicated by the blue arrow. If you still have problems identifying it, feel free to give us a call with the SEI serial number and we can verify it for you. Any reference to Original Equipment Manufacturer (OEM) names, trade names, specifications, or part numbers is for informational purposes only. Sterndrive Engineering Inc. is not affiliated with any of the OEMs referred to in this ad. Copyrights and Trademarks belong to their respective companies. Copyright 2018 Sterndrive Engineering Inc. All Rights Reserved. Powered by SixBit's eCommerce Solution Condition: New, Brand: Sei Marine Products, Manufacturer Part Number: 106CompleteD, Country//Region of Manufacture: United States, Yoke Length:New Style (9 9/16): Part Type: Mercruiser Replacement, ReplacesOE# 714-5-5010147CP: Gear Ratio 1.47/1.50

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