Mercruiser outdrive parts | Alpha one lower unit repairs

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Mercruiser Alpha One Parts Drawing

Outdrive upper gear case components #1-25 with Exploded View Diagram

  • GLM Aftermarket lower unit exploded view breakdown drawing
  • Compatible with all sterndrive models up to 1990
  • Gears, bearings, drive shaft and U-joints
  • Mercury OEM numbers for easy cross reference

Mercruiser Upper Housing Drawing 1-25

Mercruiser Alpha One upper gearcase

Photo

Description / OEM #

Price
(USD)

Price
(Canadian)

87500 Mercruiser upper housing gaskets 26-32511A1

87500

Item A
P/N 87500 Seal kit

26-32511A1

$24.95

$30.00

12110

12110

Item B
P/N 12110
Complete water pump kit (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

51220-51140

51220-51140

Item C
P/N 51220-51140
GM 4.3L V6 center rise exhaust manifold kit with riser and gaskets. 1986 and up. Click on photo for all other engine / model manifolds.

99746A17-807988A2

$361.95

$481.95

19100 Drive Shaft Assembly 1547-9412A20

19100 Drive Shaft Assembly

Item 1
New upper drive shaft housing assembly.

All ratios available (1967 - 1990, MC-1, R/MR and Gen 1, serial numbers
2791957 - OD469858)

1547-9412A20
1547-9412A21
1547-9412A22
26-33144A2
1547-9412A19

$1199.00

Engine Size

$1498.00

Engine Size

28400 Top cover assembly 94998A4

28400 Top cover assembly

Item 2
P/N 28400 Top cover assembly (includes bolts, shims and bearing)

Note: measure bearing size before ordering.

94998A4

$108.95

$143.95

80420-25-32546

80420

Item 3
P/N 80420 O-rings (5)

25-32546

$8.95

$10.95

23260 Shim 15-45691A1

23260 Shim

Item 4A
P/N 23260 Shim (For No. 21510)

15-45691A1

$8.95

$11.95

23261-15-32563A1

23261

Item 4B
P/N 23261 For bearing 21511 O.D. 1-25/32.

(Bore size 1.7813)

15-32563A1

$6.95

$8.95

21510 Top cover 31-61100A1

21510

Item 5A
P/N 21510 Bearing

(1-15/16" O.D.)

25-32546

$28.95

$37.95

21511 31-32575A1

21511

Item 5B
P/N 21511 Bearing

(1-25/32" O.D.)

25-32546

$22.95

$28.95

11130 Drive shaft 45-55796

Drive Shaft

Item 6
P/N 11130 Vertical drive shaft

45-55796

$107.95

$141.95

80190-25-55801

80190

Item 7
P/N 80190 O-rings (5)

25-55801

$4.95

$5.95

11210 Mercruiser V8 43-18411A2

11210

Item 8A
P/N 11210 Gear Set (1.50 or 1.47 Ratio) (20-22) for V8 models up to 1997

43-18410A4

$444.95

$586.95

11220 Alpha One gear set 43-45814A5

gear set

Item 8B
P/N 11220 (1.65 or 1.62 Ratio) (24-24) for 165 and inline 6 cylinder models, 1970 - 1997 serial numbers 2763442 - K999999

43-45814A5

$394.95

$520.95

11230 V6 43-75325A3

11230

Item 8C
P/N 11230 (1.84 or 1.81 Ratio) (17-19) for V6 models up to 1997

43-75325A3

$320.95

$423.95

11240-4 cylinder 43-55778A3

11240-4 cylinder 43-55778A3

Item 8D
P/N 11240 (1.98 or 1.94 Ratio) (20-24), for 120/140 and 4 cylinder models up to 1997

43-55778A3

$288.95

$380.95

21560 Alpha One 47-31-32573A1

21560 Alpha One

Item 9A
P/N 21560 Roller (1.50 Ratio)

31-32573A1

$40.95

$53.95

21540 Tapered 31-359900A1

21540

Item 9B
P/N 21540 Roller Bearing (1.65, 1.84, 1.98 Ratio)

31-35990A1

$34.95

$43.95

23270-15-36178A1

23270

Item 10
P/N 23270 Shims

15-36178A1

$9.95

$12.95

85020 Oil seal 26-32511

85020 Oil seal

Item 11
P/N 85020 Oil seal

26-32511

$12.95

$15.95

85060-26-96503-1

85060

Item 12
P/N 85060 Oil seal

26-96503

$8.95

$10.95

81180 25-25439

81180

Item 13
P/N 81180 O-rings (5)

26-32511

$4.95

$5.95

 
Item 14
P/N 28050 U-joint assembly (includes drive shaft, universal joints, socket and short yoke

814819A2

$392.95

$518.95

28315 Drive shaft 75832T1

28315 Drive shaft

Item 15
P/N 28315 Drive shaft - new and used shafts available.

814819A3

$103.95

$136.95

28030 U-Joint 805536A2

28030 U-Joint

Item 16
P/N 28030 U-joint

75832T1

$44.95

$58.95

28100 Socket 39383-1

28100 Socket

Item 17
P/N 28100 Socket (universal joints must be installed, sold separate)

39383T

$64.95

$85.95

28310 Yoke 46020-1

28310 Yoke

Item 18
P/N 28310 Yoke (short)

46020-1

$60.95

$79.95

28350 Retainer 816811-2

28350 Retainer

Item 19
P/N 28350 Retainer

816811-1

$22.95

$29.95

28390 Ring 35983

28390 Ring

Item 20
P/N 28390 Ring

35983

$11.95

$15.95

82380-25-70937

82380

Item 21
P/N 82380 O-ring (5 units)

25-70937

$12.95

$15.95

28370 Carrier assembly 66081A2

28370 Carrier assembly

Item 22
P/N 28370 Carrier assembly

25-70937

$38.95

$48.95

85030-26-823894

85030

Item 23
P/N 85030 Oil seal

26-823894

$14.95

$17.95

21520 31-35988A12

21520

Item 24
P/N 21520 Double bearing with spacer. Compatible with all ratios except 1.32.

31-35988A2

$117.95

$155.95

23280-15-35980A1

23280

Item 25
P/N 23280 Shim

15-35980A1

$11.95

$14.95