Mercruiser outdrive parts | Alpha one lower unit repairs

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Mercruiser Lower Unit Parts Diagram

Alpha One and Mercruiser outdrive components #26-50 with exploded view drawing

  • Alpha One (up to 1990) and Mercruiser lower unit GLM aftermarket parts
  • Gears, gear sets, shifting components
  • Roller and tapered bearings
  • OEM Mercury cross reference numbers

Mercruiser Alpha Lower Drawing 26-50

Photo
Description / OEM #
Price
(USD)
Price (Canadian)
87510
87510 seal kit
Item A
P/N 87510 Seal kit

26-33144A2

$38.95

$50.95

12120

12120

Item B
P/N 12120
Water pump impeller kit with housing (1984 - 1990, MR and Alpha One, serial numbers 6854393-OD469858). Click on picture for older MC-1, R and 1991 and up Gen 2 kits.

$35.95

$46.95

51230

51230

Item C
P/N 51230
GM 5.0L, 5.7L 305 - 350 V8 exhaust manifold, center rise for 1983 - 2001 models. Click on photo for all other engine / model manifolds.

860246Q11

$190.95

$251.95

81180-25-25439

81180

Item 27
P/N 81180
O-rings (5)

25-25439

$4.00

$4.00

32790-12-27880

32790

Item 28
P/N 32790
Washer

12-27880

$4.00

$4.00

21132 Clip 18-20233

21132 Clip

Item 29
P/N 21132
Clip

18-20233

$4.00

$4.00

 

Item 30
P/N 21030
Shift shaft

77481-1

$31.00

$39.00

85140 Oil passage seal 26-45577-1

85140 Oil passage seal

Item 31
P/N 85140
Oil passage seal (5 units)

26-45577-1

$8.00

$10.00

21731 Drain plug 22-8M0058389

21731 Drain plug

Item 32
P/N 21731
Drain screw (includes gasket)

22-8M0058389

$5.00

$6.00

31170-12-19183-3

31170

Item 33
P/N 31170
Gaskets for drain plugs (5)

12-19183-2

$10.00

$12.00

21870 Insert Starboard 93423

21870 Insert

Item 34
P/N 21870
Insert screen (starboard)

93423-1

$5.00

$6.00

21880 Insert screen port 93424-1

21880

Item 35
P/N 21880
Insert screen (port)

93424-1

$5.00

$6.00

12832-10-806290

Item 36
P/N 12822
Screw

10-76156

$7.00

$9.00

21161-11-859124

21161

Item 37
P/N 21161
Nut

11-45812

$4.00

$4.00

21170 Nuts 11-859116

21170

Item 38
P/N 21170
Lock nuts (5)

11-859116

$10.00

$12.00

21740-10-32470

21740

Item 39
P/N 21740
Screw

10-32470

$5.00

$6.00

22430 Screw 10-30206

22430

Item 40
P/N 22430
Screw

10-30206

$4.00

$4.00

12670 Trim tab 31640Q4

12670 Trim tab

Item 41
P/N 12670
Aluminum trim tab

31640Q4

$8.00

$11.00

21610 Drive shaft 31-42647A1

21610

Item 42
P/N 21610
Roller bearing

31-42647A1

$43.95

$53.95

11100 Lower unit 43-96084A7

11100

Item 43
P/N 11100
Gear set, forward/pinion (1972 - 1983, serial numbers 3469428-6225576)

43-96084A7

$623.95

$823.95

11190 Pinion nut 11-35921

11190 Pinion nut

Item 44
P/N 11190
Pinion nut

11-35921

$4.00

$4.00

11030 Spool 818349T1

11030 Spool

Item 45
P/N 11030
Shift spool

818349T1

$86.95

$114.95

11040 Shift crank 76865

11040 Shift crank

Item 46
P/N 11040
Shift crank

76865

$67.95

$89.95

23220 Shims 15-47397A1

23220 Shims

Item 47
P/N 23220
Shims

15-47397A1

$11.00

$14.00

21590 Mercruiser forward 31-35928T1

21590

Item 48
P/N 21590
Roller bearing

31-35928T1

$59.95

$78.95

11420 31-30895T

11420

Item 49
P/N 11420
Roller bearing

26-816464-1

$12.00

$15.00

11050 Spring 24-30893

11050 Spring

Item 50
P/N 11050
Spring for clutch dog

24-30893

$4.00

$4.00