OMC Parts Drawing *Cobra *Mercruiser *Alpha SEI Outdrives

Lower unit outdrive with exploded view breakdown drawing

Last updated on 9/26/2023

  • Alpha One (Generation 1 up to 1990) and Mercruiser outdrive lower unit components
  • Drive shaft, propeller shaft
  • Water pump kits, oil seals
  • GLM aftermarket numbers with OEM Mercury cross reference
Mercruiser outdrive parts drawing 51-77, Mercruiser Alpha One lower unit parts, Mercruiser outdrive components #26-50

Mercruiser outdrive parts drawing 51-77

Photo

Description / OEM #

Price
(USD)

Price (Canadian)

Mercruiser Alpha One lower unit parts

Lower Unit 1623-8951A43

Item A
SEI SE106
 Aftermarket
 aftermarket Alpha 1 lower gear case Alpha One Gen 1 / MerCruiser complete lower unit replacement. For 1970 – 1990 models, serial numbers 2791957-OD469858 with 13 spline vertical driveshaft, for 4-cylinder, 6 cylinder and V8 models.

OEM 1623-8951A43

$1125.96

$1499.89

21131 Cross pin

Item 51
P/N 21131
 Cross pin

17-8M0020941

$4.95

$ 6.89

11060 Clutch dog

11060 Clutch dog

Item 52
P/N 11060
 Clutch dog

52-853594T

$225.95

$ 297.89

Prop shaft

Propeller Shafts

Item 53
P/N 11155
 Propeller shaft

44-850308

$660.95

$ 630.89

23290 Shim kit for thrust washer in gear housing

23290 Shims

Item 54
P/N 23290
 Shim

15-97166

$4.95

$ 6.89

23141 Thrust ring for 1983 and older only OEM 35915

23141 thrust ring

Item 55A
P/N 23141
 Thrust ring (1970 – 1982)

35915

$26.95

$ 36.89

23140 Thrust ring

23140

Item 55B
P/N 23140
 Thrust ring (1983 and up)

26-816575A2

$11.95

$ 15.89

21620 Lower unit ball bearing

21620

Item 56
P/N 21620
 Bearing

30-88957T

$37.95

$ 56.89

83445 O ring

Item 57
P/N 83445
 O-rings (5 units)

25-896524

$10.95

$4.89

11410 Roller bearing for prop shaft

11410

Item 58
P/N 11410
 Prop shaft bearing

31-30956

$10.95

$12.89

11405 Bearing carrier

Item 59
P/N 11405
 Bearing carrier

818763A10

$157.95

$ 263.89

85130 Oil seal

85130 Oil seal

Item 60
P/N 85130
 Oil seal (inside)

26-14077

$7.95

$ 13.89

85700 Oil seal

Item 61
P/N 85700
 Oil seal (outside)

26-12224

$12.95

$ 20.89

11080 Lower unit key (5) OEM number 28-30281

11080 Key

Item 62
P/N 11080
 Key

28-30281

$4.95

$4.89

11380 Lower unit tab washer OEM 14-79447

11380

Item 63
P/N 11380
 Keyed washer

*For gears, see part number 43

14-79447

$6.95

$ 10.89

21120

Item 64
P/N 21120
 Cover nut

8M2011027

$18.95

$ 29.89

21301 Thrust hub

21301 Thrust hub

Item 65
P/N 21301
 Thrust hub

12-835467Q01

$22.95

$ 37.89

21760 Lock washer

21760

Item 66
P/N 21760
 Lockwasher

13-42351-1

$5.95