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 11/13/2023

  • 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 Mercruiser seal kit

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