OMC Parts Drawing *Cobra *Mercruiser *Alpha SEI Outdrives

Stern drive and Alpha One upper gear housing components #26-48 with breakdown drawing

Last updated on 11/11/2023

  • Exploded view drawing for easy upper gearcase component identification with photos
  • Compatible with Mercruiser and Alpha One outdrives up to 1990
  • Shift shafts, seals and kits
  • GLM Aftermarket and OEM Mercury numbers for easy cross referencing

Mercruiser Alpha One 26 to 48

Mercruiser Alpha One Parts Drawing, Mercruiser Alpha One Parts Drawing

Mercruiser Alpha exploded view parts 26-48

Photo

Description / OEM #

Price
(USD)

Price (Canadian)

12110 Water pump

Item A
P/N 12110
 Water pump impeller kit with housing (1970 – 1983, MC-1 and R models, serial numbers 2763442-6854392). Click on picture for newer 1984-1990 Alpha One and 1991 and up Gen 2 models.

$39.95

$ 66.89

58231

Item B
P/N 58231
 Complete GM 305/350 V8 manifold conversion kit, from older log style to newer center rise. Click on photo for all other engine / model manifolds.

$598.95

$ 1,438.89

28380 Spacer.

28380 Shims

Item 26
P/N 28380 Shim

15-71013

$7.95

$ 10.89

Mercruiser Alpha One 26 to 48

28330 Tension washer

Item 27
P/N 28330 Washer

12-45810

$4.95

$4.89

28360 Lock nut

28360 Nut

Item 28
P/N 28360 Nut

11-22339

$4.95

$5.89

22420 Alpha 1 Gen-2 Screw kit

22420

Item 29
P/N 22420 Screw

10-79953Q2

$4.95

$4.89

31170 Washer

31170

Item 30
P/N 31170 Washers (5)

12-19183-2

$4.00

$4.89

28300 Screw

28300 Screw

Item 31
P/N 28300 Screw

10-98794

$3.95

$4.89

28300 Screw

21890 Plug

Item 32
P/N 21890 Plug

19-47579

$4.95

$4.89

21170 Lock nut

21170

Item 33
P/N 21170 Lock nuts (5)

11-13439-1

$4.95

$4.89

21170

31150 Gasket

Item 34
P/N 31150 Gasket

27-55810-1

$4.95

$4.89

22440 Screw.

22440

Item 35
P/N 22440 Screw

10-28668

$4.95

$4.89

12200 Water pocket cover kit

12200 Pocket cover kit

Item 36
P/N 12200 Water pocket cover kit (includes plastic housing, copper tube, 4 screws, base gasket and grommet)

42724A3

$28.95

$ 45.89

21423 Bushing for intermediate shift shaft 23-32632

21423 Bushing

Item 37
P/N 21423 Bushing (metal, for shift shaft)

23-32632

$20.95

$ 28.89

85150 Grommet for water tube

85150 Seal

Item 38
P/N 85150 Grommet

26-36557

$4.95

$4.89

12202 Water tube 32-54236

12202 Mercruiser water tube

Item 39
P/N 12202 Water Tube

32-54236

$8.95

$ 12.89

22031 Welch plug 19-42682.

22031 Welch plug

Item 40
P/N 22031 Welch Plug (1-1/4 O.D.)

19-42682

$4.00

$4.89

22032 Pipe plug 22-428611.

22032

Item 41
P/N 22032 Pipe plug

22-42861-1

$4.00

$4.89

21421 INTERMEDIATE SHIFT SHAFT

21421

Item 43
P/N 21421 Intermediate Shift Shaft

62104-1

$43.95

$ 77.89

21422 washer

21422

Item 44
P/N 21422 Washer

12-32666

$3.95

$4.89

cotter pin

22100 Cotter pin

Item 45
P/N 22100 Cotter pins (10)

18-32665

$4.95