Mercruiser outdrive parts *SEI lower unit *Alpha 1 repairs

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Mercruiser parts *Alpha 1 *Alpha gen 2 *Drawings

Tech breakdown drawings for easy component identification

  • Upper and lower gear case drawings (1967 - 1983)
  • Alpha One Gen 1 (1984 - 1990) and Gen 2 (1991 - up) exploded views
  • Links to a complete list of components with photos and OEM numbers
  • Bell housing and gimbal housing breakdowns

Click Photo for Components

Lower Units

Mercruiser Alpha 1 lower unit parts drawing

Mercruiser Alpha 1 lower unit
parts drawing

Mercruiser lower unit, including Alpha one generation one models

1970 - 1990 models, serial numbers 2791957 - 0D469858

Mercruiser generation 2 lower unit

Alpha One Gen 2 Lower Unit

1991 - up models, serial numbers 0D469859 - up

Click Photo for Parts

Upper Gearcases

upper gearcase
Upper Gearcase

Alpha 1 upper gear case For MC-1, R, MR and Generation 1

1970 - 1990 models, serial numbers 2791957 - 0D469858

Mercruiser generation 2 upper gearcase

Alpha One Gen 2 upper unit

1991 - Present models, serial numbers 0D469859 - up

Click Photo for Larger View
Bell Housing / Gimbal Housing
Mercruiser bell housing layout

Bell Housing Layout

1970 - 1990 models, serial numbers 2791957 - 0D469858

Alpha 1 generation 2 bell housing layout

Alpha 1 generation 2
bell housing layout

Bell housing for Generation 2

1991 - present models, serial numbers 0D469859 and up

Alpha One Generation 2 Bell housing with transom service parts and install video.

Mercruiser gimbal housing

Gen 2 Transom

Gimbal housing for Mercruiser, Alpha One and Alpha One gen 2 outdrives

R, MR, Alpha 1 and Generation 2 outdrive
Gimbal housing exploded view parts drawing

  1. P/N 85420 Oil Seal OEM 26-54925
  2. P/N 85440 Oil Seal 26-32911
  3. P/N 21906 Gimbal Bearing 30-879194A01
  4. P/N 85910oil seal
  5. P/N 21790 clamp
  6. P/N 89080 Bellow 74639A2
  7. P/N 21791 Clamp 54-31766
  8. P/N 21970 Trim connector parts kit 98825A4
  9. P/N 32500 Gasket
  10. P/N 05009 Lockwasher
  11. P/N 22440 Screw
  12. P/N 86712 Transom Seal
    (MC-1/R/MR/Alpha One) 65533A1
  13. P/N 86711 Transom
    Seal Alpha One generation 2 OEM 243713
  14. P/N 82460 Seal 41802
  15. P/N 12700 Anode 5598909
  16. P/N 30355 Gasket 12-56085
  17. P/N 12713 Anode 82163101
  18. P/N 85656 Seal 012077
  19. P/N 33000 Gasket 44108-1
  20. P/N 22147 Cotter Pin 18-54929
  21. P/N 01071 Clamp
  22. P/N 47110 Water Hose 3/4" O.D. 32-41725-33
  23. P/N47120 Water Hose 5/8"0.D. 32-32461
  24. P/N 21164 Locknut 11-25599    
  25. P/N 12967 Plug 22-88847
  26. P/N 16005 Plug Kit 22-88847A1
  27. P/N 12713 Aluminum Anode Kit 821631Q1
  28. P/N 21180 Locknut 11-826711-9

Exhaust manifolds and risers
Exhaust manifold kit

Exhaust manifold kit

58232 GLM exhaust manifold kit 1983-2001

58232 GLM Marine aftermarket Mercruiser years 1983 to 2001 exhaust manifolds kit

P/N 58231 / 58232 Complete Mercruiser GM V8 small block Chevy exhaust manifold set with 3 inch or 4 inch riser.

GLM Marine aftermarket Mercruiser exhaust manifold parts:

  1. P/N 51230 V8 small block chevy cast iron exhaust manifold assembly / 860246Q11 x 2
  2. P/N 51110 / 98504A3 or 51140 / 807988A2 V8 small block Chevy exhaust elbow - riser (3 inch or 4 inch) x 2
  3. P/N 31100 Gasket / 27-33395 x 2
  4. P/N 30240 Gasket / 27-863724 x 2
  5. P/N 13991 90 degree hose fitting / 22-806926 x 2
  6. P/N 13992 Drain plug / 22-806608A02 x 2
  7. P/N 80140 O-ring for plug / 25-45253 x 2
  8. P/N 22391 Stud / 16-49545 x 8
  9. P/N 21248 Locknut / 11-46335 x 8


GLM Marine aftermarket Mercruiser exhaust manifold parts compatible with:

305 V8 200, 1985 - 1987(S/N 6899058 - 0B774444)
228, 1983 - 1995 (S/N 6218462 - 0F600999)
230, 1985 - 1987 (S/N 6899269 - 0B773739)
230 MEI, 1981 - 1987 (S/N 5907058-0B788151)
5.0L, 1988 - 1995 (S/N 0B774445 - 0F600999)
5.0L EFI Gen +, 1998 - 2001, (S/N 0L012052 - Up)
5.0L LX, 1988 - 1995 (S/N 0B773740 - 0F600999)
898, 1983 - 1984 (S/N 6218462 - 6899057)
260, 1983 - 1987 (S/N 6218462 - 0B773304)
260 MEI, 1981 - 1987 (S/N 5907058 - 0F024999)
300, 1985 - 1986 (S/N 6668677 - 0B430367)
320 EFI 1987 - 1989 (S/N 0A543604 - 0C622418)
350 MAG Alpha 1986 - 1987 (S/N 0A635178 - 0K999999)
350 MAG Alpha EFI 1996-1997 (S/N 0F800300 - 0K999999)
350 MAG Bravo MPI, 1995 - 1997 (S/N 0F415189 - 0K999999)
350 MAG EFI Ski, 1994 - 1997 (S/N 0F215561 - 0K999999)
350 MAG MPI Horizon 1998 - 2001 (S/N 0L010019 - up)
350 Mag MPI MIE, 1998 - 2001 (S/N 0L002008- up)
350 Mag MPI Ski, 1995 - 1996 (S/N 0F350583 - 0F799999)
350 Mag MPI Ski Gen +, 2001 - up (S/N 0M300000 - up)
5.7L, 1988 - 2001 (S/N 6218462 - up)
5.7L EFI 1995 - 2001 (S/N 0F225560 - up)
5.7L EFI MIE, 1997 (S/N 0K40300 - 0K999999)
5.7L MIE Gen +, 1998 - 2001 (S/N 0L002003 - up)
5.7L Ski, 1985 - 2001 (S/N 0A338533 - up) 5.7L LX
350 / EFI / Bravo, 1996 - 1997
(S/N 0F601000 - 0K999999)
377 Scorpion MCM, 2001 - 2001
(S/N 0L416146 - up)
377 Scorpion Ski, 1997 - 1998
(S/N 0K000656 - up)
MX 6.2L MPI 377 / Horizon, 2000 - 2001 (S/N 0L68003 - up)

$599 US

$791 CDN