OMC Parts Drawing *Cobra *Mercruiser *Alpha SEI Outdrives

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  • Mercruiser Alpha One Parts Drawing 1 to 25

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

Last updated on 9/20/2023

  • GLM Aftermarket lower unit / upper gearcase 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 Alpha One Parts Drawing, Mercruiser Alpha One Parts Drawing

Mercruiser Alpha One upper gearcase

Photo

Description / OEM #

Price
(USD)

Price (Canadian)

87500

87500

Item A
P/N 87500 Seal kit

26-32511A1

$29.89

$39.89

12110 water pump

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.

$51.89

$66.89

Mercruiser Alpha One Parts Drawing

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

$484.89

$629.89

Mercruiser Alpha One Parts Drawing

SEI upper gear case

Item 1

SE106-UP New upper SEI upper gear case assembly.

All ratios available for 4 cylinder, 6 cylinder and V8. Replaces most 1970 – 1990 models, MC-1, R / MR and Alpha 1 Gen 1, serial numbers
2791957 – OD469858)


 *Note – these units are only compatible with units that have the 9-9/16″ output shaft yoke. If you have a shorter yoke shaft which measures 8-1/8″, this unit will not work. Please contact us to order the shorter yoke version.

 

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

$1099.89

$1430.89

Mercruiser Alpha One Parts Drawing

28400 Top cover assembly

Item 2

P/N 28400 Top cover assembly (includes bolts, shims and bearing 1-25/32″ o.d.)

Note: only compatible with MR/Alpha 1 Gen 1 models, years 1983-1990 measure bearing size before ordering.

94998A4

$130.89

$170.89

Mercruiser Alpha One Parts Drawing

80420

Item 3
P/N 80420 O-rings (5)


25-32546

$11.89

$15.89

Mercruiser Alpha One Parts Drawing

23260 Shim

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

15-45691A1

$14.89

$18.89

Mercruiser Alpha One Parts Drawing

23261

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

(Bore size 1.7813)

15-32563A1

$12.89

$16.89

Mercruiser Alpha One Parts Drawing

21510

Item 5A
P/N 21510 Bearing

(1-15/16″ O.D.)

25-32546

$36.89

$47.89

Mercruiser Alpha One Parts Drawing

21511

Item 5B
P/N 21511 Bearing

(1-25/32″ O.D.)

25-32546

$19.89

$25.89

drive shaft

Drive Shaft

Item 6
P/N 11130 Vertical drive shaft

45-55796

$107.95

$141.95

Mercruiser Alpha One Parts Drawing

80190

Item 7
P/N 80190 O-rings (5)

25-55801

$6.89

$8.89

Gear set

11210 Heavy duty gear set

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

43-18410A4

$430.89

$559.89

Mercruiser Alpha One Parts Drawing

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

$268.89

$348.89

Mercruiser Alpha One Parts Drawing

11230

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

43-75325A3

$337.89

$438.89

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

$320.89

$416.89

Mercruiser Alpha One Parts Drawing

21560 Alpha One

Item 9A
P/N 21560 Roller (1.50 Ratio)

31-32573A1

$52.89

$68.89

Mercruiser Alpha One Parts Drawing

21540

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

31-35990A1

$39.89

$50.89

Mercruiser Alpha One Parts Drawing

23270 Mercruiser Alpha 1 shim kit

Item 10
P/N 23270 Shims

15-36178A1

$14.89

$18.89

oil seal

85020 Oil seal

Item 11
P/N 85020 Oil seal

26-32511

$16.89

$21.89

85060

Item 12
P/N 85060 Oil seal

26-96503

$11.89

$14.89

Mercruiser Alpha One Parts Drawing

81180

Item 13
P/N 81180 O-rings (5)

26-32511

$4.95

$5.95

drive shaft

28050 Drive shaft parts with internal lock ring

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

814819A2

$392.95

$518.95

drive shaft

28315 Drive shaft

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

814819A3

$147.89

$191.89

Mercruiser Alpha One Parts Drawing

28030 U-Joint

Item 16
P/N 28030 U-joint

75832T1

$52.89

$68.89

28100 Socket

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

39383T

$89.89

$115.89

28310 Yoke

Item 18
P/N 28310 Yoke (short)

46020-1

$79.89

$102.89

28350 Retainer

Item 19
P/N 28350 Retainer

816811-1

$28.89

$37.89

28390 Ring

Item 20
P/N 28390 Ring

35983

$14.89

$19.89

82380

Item 21
P/N 82380 O-ring (5 units)

25-70937

$12.95

$15.95

28370 Alpha Carrier Assembly

Item 22
P/N 28370 Carrier assembly

25-70937

$51.89

$66.89

85030

Item 23
P/N 85030 Oil seal

26-823894

$18.89

$23.89

21520

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

31-35988A2

$179.89

$234.89

23280

Item 25
P/N 23280 Shim

15-35980A1

$21.89

$27.89

Numbers 26-48