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OMC Parts Drawing *Cobra *Mercruiser *Alpha SEI Outdrives

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Mercruiser Alpha 1 V8 rebuild kit *Upper

GM V8 260 outdrive upper rebuild kit with gears, bearings
Alpha One and Gen 2

Updated May 10 2026

  • MerCruiser, Alpha 1 and Alpha 1 Gen 2 models
  • Includes upper housing gears, seals, shims and bearing.
  • Compatible with 225, 898, 260 and Alpha drives
  • 1.50 and 1.47 ratio (20/22 teeth)
  • Kits include large bearing assembly with spacer.
  • SEI Alpha 1 upper gearcases available

Mercruiser 898 / 228 / 260 and Alpha 1, 1977 - 1990 serial numbers 4782330 - 0D 460000

Price
(USD)

Price
(Canadian)

Mercruiser Alpha One V8 Rebuild Kit
Mercruiser Alpha One V8 Rebuild Kit

P/N 11215
Parts:

  • 11210 Gear Set
  • 87500 Seal Kit
  • 39622 Outdrive Kit
  • 21560 Bearing
  • 21520 Bearing assembly and spacer
  • 21510 Top cover bearing
  • 23260 Shim
  • 23270 Shim
  • 23280 Shim

$616.99

$ 757.89

Alpha 1 Gen 2, 1991 - 1997 (serial numbers 0D 469859 - 0K 999999)

Price
(USD)

Price
(Canadian)

P/N 11216
Parts:

  • 11210 Gear Set
  • 21510 Top cover bearing
  • 21511 Top cover bearing
  • 21520 Double bearing assembly
  • 21560 Bearing
  • 23260 Shim
  • 23261 Shim
  • 23280 Shim
  • 39622 Gasket kit
  • 87501 Seal Kit

$599.96

$ 757.89

Alpha 1 Gen 2, 1998 and up
( serial numbers OL000040 Up )

Price
(USD)

Price
(Canadian)

P/N 11217

Parts:

  • 11214 Gear set
  • 21511 Bearing, top cover
  • 21522 Bearing assembly
  • 21560 Tapered bearing
  • 23261 Shim
  • 23270 Shim
  • 23280 Shim
  • 39622 Outdrive gasket
  • 87501 Seal kit

$699.96

$ 581.89

Recommended compounds for installation

Price
(USD)

Price
(Canadian)

508235 OMC Johnson Compound

P/N 508235

Gasket sealing compound.

$24.95

$32.89

609 Loctite

P/N 609

609 Loctite for oil seals. Low viscosity and fast drying. 

Adds 3000 psi of holding power.

$9.95

$12.89

Parts included in rebuild kits (see list of parts beside each kit above)

11210

P/N 11210 

  • Upper housing gear set
  • 20/22 ratio 1.50
  • 43 – 18411 A2
  • Included in kit P/N 11215 and P/N 11216
  • 1977 to 1997 Mercruiser and Alpha 1, Alpha 1 Gen 2 models,
  • serial numbers 4782330 – OL 000000.

$467.96

$ 598.89

11214 gear set

P/N 11214 

Upper housing gear set, 20/22 ratio 1.47 43 – 18411 A2. Included in kit P/N 11217, for Alpha 1 Gen 2 models 1998 and up, serial numbers OL 000040 Up.

$534.96

$ 453.89

M-21520-drive-shaft-housing-bearings-31-35988A12

drive shaft housing bearings

P/N 21520

  • Upper gear case double bearing assembly with spacer
    31 – 35988 A2.
  • Included in kit P/N 11215 and P/N 11216 for 1977 – 1997
  • Mercruiser and Alpha 1, Alpha 1 Gen 2 models, serial numbers
    4782330 – OL 000000.

$123.96

$ 375.89

Roller bearing assembly with spacer

P/N 21522 

Roller bearing assembly with spacer

31 – 30894 A5. Included in kit P/N 11217, for Alpha 1 Gen 2 models 1998 and up, serial numbers
OL 000040 Up.

$128.96

$ 167.89

21560

P/N 21560 

Driven gear tapered bearing

31 – 32573 A1

Included in kits 11215, 11216 and 11217.

$42.96

$ 68.89

top cover bearing 31-32575T1

P/N 21511

Top cover bearing,

1-25/32 O.D.

31 – 32575 T1

Included in kit 11216 and 11217.

$8.96

$ 15.89

Mercruiser Alpha One V8 Rebuild Kit

top cover bearing 31-61100A1

P/N 21510 

Top cover bearing

1-15/16 O.D.

31- 61100 A1

Included in kit 11215.

$30.96

$ 47.89

87500 sterndrive upper seal kit

87500 sterndrive seal kit

P/N 87500

  • Upper gear case seal kit for Mercruiser and Alpha 1, up to 1990
  • serial numbers
    2062141 – 0D 469000
  • 26 – 32511 A1
  • Included in kit 11215.

$24.96

$ 30.89

Mercruiser Alpha One V8 Rebuild Kit

87501

P/N 87501

  • Upper gear case seal kit for Alpha 1 Generation 2 models
  • Years 1991 and newer
  • serial numbers 0D 469859 up
  • 26 88397 A1
  • Included in kit 11216 and 11217.

$26.96

$ 43.89

Mercruiser Alpha One V8 Rebuild Kit

drive gear shim

P/N 23280 

Double bearing shims, for all models 1970 and up, all serial numbers.
15 – 35980 A1
Included in kits 11215, 11216 and 11217.

$11.96

$ 27.89

Mercruiser Alpha One V8 Rebuild Kit

23270 shims

P/N 23270 
Lower bearing shims, for all models 1970 and up, all serial numbers.
15 – 36178 A1
Included in kits 11215, 11216 and 11217.

$9.96

$13.89

Mercruiser Alpha One V8 Rebuild Kit

P/N 23261

  • Top cover bearing shims, for bearing 21511 with 1-25/32 O.D.
  • Gen 2 models 1996 and up
  • serial numbers
  • 0F 680000 up.
  • Included in kits 11216 and 11217.

$6.96

$ 16.89

Mercruiser Alpha One V8 Rebuild Kit

23260

P/N 23260

  • Top cover bearing shims
  • Bearing 21510 with 1-15/16 O.D.
  • Mercruiser and Alpha 1 models
  • Years 1970 to 1995
  • Serial numbers 3213658 – 0F 679999
  • 31 – 61100 A1 is  in kit 11215.

$8.96

$ 18.89

Mercruiser Alpha One V8 Rebuild Kit

Bell housing gasket

P/N 39622 
Bell housing out drive installation gasket kit. Used between the upper gear case and bell housing.

Includes 2 o rings for end of input shaft and exhaust area seal.
27 – 94996 T2. Included in kits 11215, 11216 and 11217.

$9.96

$ 9.89