Mercruiser outdrive parts *Alpha 1 lower unit *Repairs

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Mercruiser upper gearcase parts diagram

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

  • 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 exploded view parts

Mercruiser Alpha exploded view parts

Photo

Description / OEM #

Price
(USD)

Price
(Canadian)

12110 Water pump 120-140-165-260

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

$52.95

58231

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

$790.95

28380 Shims 15-71013

28380 Shims

Item 26
P/N 28380 Shim

15-71013

$7.95

$8.95

28330 Tension washer 12-45810

28330 Tension washer

Item 27
P/N 28330 Washer

12-45810

$4.95

$5.95

28360-11-22339

28360

Item 28
P/N 28360 Nut

11-22339

$4.95

$5.95

22420-10-79953Q2

22420

Item 29
P/N 22420 Screw

10-79953Q2

$4.95

$5.95

31170-12-19183-3

31170

Item 30
P/N 31170 Washers (5)

12-19183-2

$4.00

$4.00

28300 Screw 10-98794

28300 Screw

Item 31
P/N 28300 Screw

10-98794

$3.95

$4.95

21890 Plug 19-47579

21890 Plug

Item 32
P/N 21890 Plug

19-47579

$4.95

$5.95

21170 Nuts 11-859116

21170

Item 33
P/N 21170 Lock nuts (5)

11-13439-1

$4.95

$5.95

31150 Gasket 27-55810-1

31150 Gasket

Item 34
P/N 31150 Gasket

27-55810-1

$4.95

$5.95

22440-10-28668

22440

Item 35
P/N 22440 Screw

10-28668

$4.95

$5.95

12200 Pocket cover kit 42724A3

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

$36.95

21423 Bushing 23-32632

21423 Bushing

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

23-32632

$20.95

$27.95

85150 Seal 26-45577-1

85150 Seal

Item 38
P/N 85150 Grommet

26-36557

$4.95

$5.95

12202 Water tube 32-54236

12202

Item 39
P/N 12202 Water Tube

32-54236

$8.95

$10.95

22031 Welch plug 19-42682

22031 Welch plug

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

19-42682

$4.00

$4.00

22032-Plug-22-42861-1

22032

Item 41
P/N 22032 Pipe plug

22-42861-1

$4.00

$4.00

21421 INTERMEDIATE SHIFT SHAFT

21421

Item 43
P/N 21421 Intermediate Shift Shaft

62104-1

$43.95

$57.95

21422-12-32666

21422

Item 44
P/N 21422 Washer

12-32666

$3.95

$4.95

22100 Cotter pin 18-32665

22100 Cotter pin

Item 45
P/N 22100 Cotter pins (10)

18-32665

$4.95

$5.95

87500 Mercruiser upper housing gaskets 26-32511A1

87500

Item 46
P/N 87500 Seal kit

26-32511A1

$24.95

$31.95

39622

39622 Bell housing gasket

Item 47
P/N 39622 Bell housing gasket kit (1983 - present, serial numbers 6225577 and up)

27-94996T2

$9.95

$12.95

39590

39590

Item 48
P/N 39590 Outdrive installation gasket kit (1967 - 1982, serial numbers 2062141 - 6225576)

27-64818T4

$9.95

$12.95