Mercruiser outdrive parts drawing *Videos *SEI sterndrive

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SEI lower unit outdrive *Upper gearcase V8-V6-4 cylinder

Brand new aftermarket SEI replacement sterndrives lower/upper gearcase housing now in stock in Canada

  • Now able to offer brand new SEI sterndrive units both upper and lower housings for Mercruiser 1, R, MR and Alpha 1 model boat
  • New and some used mercruiser sterndrives units for 4 cylinder, 6 cylinder V6 and V8 boat engines. For used models please contact order desk for availability.
  • Includes drive shaft yoke, u-joints, trim tab and mounting gaskets
  • Tech support Exploded view outdrive drawings
  • Note vertical drive shaft model number does not have pre-load pin at top and is not required on replacement
  • Sterndrive engineering inc has three-year fault-free warranty please contact them in regards to warranty
  • At this time we do stock SEI Marine Johnson/Evinrude outboard lower units
  • Replacement outboard lower units for Johnson Evinrude and Yamaha

SEI aftermarket Mercruiser Alpha One lower unit

SEI aftermarket Mercruiser Alpha One lower unit

P/N SEI-106

  • Mercruiser 1 / R / MR / Alpha One
  • Complete lower units
  • Model number for years 1970 to 1990
  • Outdrive serial numbers 2791957-OD469858
  • 13 spline vertical driveshaft
  • 120/140 4 cylinder models 470 / 485
  • 160/165 6 cylinder
  • Up to 300 horsepower boat
  • Please contact SEI Marine for the details on the three year fault free warranty
  • Note free shipping does not apply to SEI Marine products or on returns if required.
$1199.99

SEI aftermarket Mercruiser Alpha One sterndrive

SEI item number 18100 lower unit OEM number 1623-8951A43

SEI 106 Aftermarket Mercruiser Alpha 1 upper sterndrive

SEI 106 Aftermarket Mercruiser Alpha 1 upper sterndrive

P/N SEI-106-1.50

  • Mercruiser 1 / R / MR / Alpha One complete upper unit.
  • Years 1974 - 1990 models with 205 /230 / 260 horsepower V8 motors
  • 1.47 and 1.50 gear ratio with a 20-22 tooth count
  • Compatible with 888, 898, 228,225-S, 233, 250, 260, 5.0 liter 305 and 5.7 liter 350 models serial numbers 2763442 and up.
$1125.99

SEI 106 Aftermarket Mercruiser Alpha 1 upper sterndrive

SEI 106 Aftermarket Mercruiser Alpha 1 upper sterndrive

P/N SEI-106-1.98
  • Mercruiser R/MR/Alpha One Gen 1 complete upper unit.
  • For 1970 - 1990 models, 4 cylinder
  • 1.94 / 1.98 gear ratios with
    20-24 tooth count
  • Compatible with 120 to 140 horsepower models with a 2.5 or 3.0 liter motor
  • Years 1971 to 1990, serial numbers 2791957 to 6225576
$1125.99

*Note - before ordering, please measure your output shaft that goes into the engine. Replacement upper units come with an output shaft that measures 9-9/16 inch. If your shaft is the 'short style' which measures 8-1/8 inches, please contact order desk for availability.

SEI 106 Aftermarket Mercruiser Alpha 1 upper sterndrive

SEI 106 Aftermarket Mercruiser Alpha 1 upper sterndrive

P/N SEI-106-1.81

  • Mercruiser R/MR/Alpha One Gen 1 complete upper unit
  • Years 1976 - 1982 models with 4 cylinder
  • 470 / 485 models and 1986 - 1990
  • 4.3 liter V6. 1.81 / 1.84 gear ratio with a 17-19 tooth count
  • Compatible with inline 4 cylinder 3.7 liter motors serial numbers 4208730 to 6225576
  • and 4.3 liter 185 / 190 horsepower V6 motors serial numbers 6225577 to 0D469858
$1125.99

*Note - before ordering, please measure your output shaft that goes into the engine. Replacement upper units come with an output shaft that measures 9-9/16 inch. If your shaft is the 'short style' which measures8-1/8 inches, please contact us for availability.

SEI 106 Aftermarket Mercruiser Alpha 1 upper sterndrive

SEI 106 Aftermarket Mercruiser Alpha 1 upper sterndrive

P/N SEI-106-1.65

  • Mercruiser R/MR/Alpha One Gen 1 complete upper unit.
  • Years 1970 - 1977 models with 165 horsepower inline 6 cylinder
  • 1.65 / 1.62 gear ratio with a 24-24 tooth count
  • Compatible with 165 models serial numbers 2763442 and up.

*Note - before ordering, please measure your output shaft that goes into the engine. Replacement upper units come with an output shaft that measures 9-9/16 inch. If your shaft is the 'short style' which measures 8-1/8 inches,please contact order desk for availability.

SEI aftermarket Mercruiser Alpha One Gen 2 outdrive

SEI 116 Mercruiser Alpha 1 gen 2 upper sterndrive
SEI 116 Mercruiser Alpha 1 gen 2 upper sterndrive

P/N SEI-116-1.47
  • Mercruiser Alpha One gen 2 complete upper unit
  • Years 1991 - up models with 230 / 260 horsepower V8 motors
  • 1.47 gear ratio with a 20-22 tooth count
  • Compatible with 5.0 liter 305 and 5.7 liter 350 models Mercruiser serial numbers 0D470000 and up
$1125.99

*Note - does not work with the 305 V8 200 horsepower model

SEI Mercruiser Alpha One gen 2 sterndrive
SEI Mercruiser Alpha One gen 2 lower unit sterndrive

P/N SEI-116

  • Alpha 1 Gen ii complete replacement lowers
  • Years 1991 and up models with metal water pump impeller housing
  • Lower unit serial numbers OD470000-Up
  • Up to 300 horsepower
  • Will not replace 2.00 or 2.40 ratio units
  • Mercruiser Alpha One gen II
$1269.99

  1. WARRANTY. All products manufactured by SEI Marine are covered by warranty for either a period of one (1) year for upper gear cases purchased without u-joints and output shafts, or two (2) years for replacement lower units and upper gear cases purchased with u-joints and output shafts from the date of actual date.
  2. A condition of qualification of these warranties is proof of purchase of the SEI product.
  3. Proof of purchase must be supplied by customer prior to warranty application and/or receiving warranty benefits.
  4. These one year and three year warranties against manufacturing defects in workmanship and components are the sole and exclusive warranty provided by SEI Marine products and all other warranties and potential damages are limited and excluded.
  5. These warranties commence on the shipment date of products to the customer sold by TC Electronics to the purchaser for more information contact SEI limited sterndrive engineering warranty or service information.
  6. SEI Marine now carries Mercury/Johnson outboard lower unit parts and complete Bravo one sterndrives

Customers who ordered SEI Mercruiser sterndrives or parts also purchased:

90190 Mercruiser tool bearing carrier retainer wrench
90190 Mercruiser tool bearing carrier retainer wrench

P/N 90190 Bearing carrier retainer wrench for Alpha one and gen ii lower units OEM 91-61069T $97.95

90100 Mercruiser bearing retainer wrench
90100 Mercruiser bearing retainer wrench
P/N 90100 Bearing retainer wrench Alpha one, Bravo, R, MR Outdrive OEM 91-17256 $75.95

Bearing Carrier Puller

Bearing Carrier Puller

90095 Bearing Carrier Puller

P/N 90095 Lower unit bearing carrier puller Mercruiser or Alpha One sterndrive and Mercury, Johnson Evinrude and Yamaha outboard lower units $104.99

90095

87510 Seal Kit 26-33144A2
87510 Seal Kit 26-33144A2

P/N 87510 GLM Marine aftermarket Mercruiser lower unit gear case seal kit is required when re-assembling the parts in lower unit. Replaces Mercruiser OEM parts number 26-33144A2, Sierra lower unit OEM part number 18-2652.

M 12110 Water kit 1970-1983
M 12110 Water pumps 1970-1983

P/N 12110 years 1970 to 1983 Mercury / Mercruiser sterndrive water pump serial numbers 2763442 - 6854392 $39.95

GLM Marine aftermarket lower unit Mercury / Mercruiser 1 / R years 1970 - 1983
Mercruiser serial numbers 2763442 - 6854392
Sterndrive water pump parts include:
  • P/N 89840 Water pumps impellers
    OEM number 47-89984T4
  • P/N 11070 Key 28-56654
  • P/N 12410 Water pumps housing 46-96148T1
  • P/N 12310 Water pumps base 46-57234T1
  • P/N 12820 Guide tube 23-29804T
  • P/N 12810 Cup 48752
  • P/N 12510 Wear plate 32435
  • P/N 31010 Gasket 27-85608-1

21450 shift cable kit

21450 shift cable kit

21450 Mercruiser kit OEM 865436A03

21450 GLM Marine aftermarket Mercruiser cable OEM number 865436A03

Parts included in kit

P/N 21450 Newer style shift cable set with larger cable core wire. This installs from the AFT end of the bell housing. Note: cable models from the mid 1960's - 1982 used cables which threaded in from behind the bell housing. You can make an easy modification to the bell housing yourself by using a 1/4-18 tap from inside of the bell housing OEM 865436A03. $79.95

Shift cable parts kit include:
P/N 21750 Set screw OEM number 10-45590
P/N 21080 Slide / 850752-1
P/N 21090 Set screw / 10-31700
P/N 21140 shaft lever / 45518A3
P/N 21430 Guide set / 43433
P/N 21432 Anchor / 43436
P/N 21433 Set screws / 10-20518
P/N 21462 Wrapping and wire / 38473
P/N 21463 Insert / 14705
P/N 21464 Stainless steel core wire
P/N 21710 Shift cable assembly / 41951A1
P/N 21750 Set screw 10-45590
P/N 21790 Bellows clip / 54-38863
P/N 21791 Hose clamp / 54-85504320
P/N 31160 Rubber gasket / 27-35982
P/N 39622 Bell housing gasket set / 27-94996T2
P/N 80120 Drive shaft o rings 25-48171
P/N 82200 O ring 25-33504
P/N 89080 Bellow / 74639A2

90150 Universal gear puller

90150 Universal gear puller

P/N 90150 Universal gear puller for inboard and Mercury Johnson Evinrude outboard lower units $119.95

90110 Shift Cable

90110 Shift Cable Tool

P/N 90110 Shift cable tool OEM 91-12037 $33.95

90200 Hinge Pin

90200 Hinge Pin

P/N 90200 Hinge pin tool OEM 91-78310 $17.95

90065 Prop Wrench Kit

90065 Prop Wrench Kit

P/N 90065 Boat propeller wrench - Mercury 91-8218871 Honda 89-89206-ZW7-000AH $19.95

Contact us by email for any additional information or technical help omc@sterndrive.info