Mercruiser outdrive parts | Alpha one lower unit repairs

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Mercruiser Alpha 1 Parts 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

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Lower Units
Mercruiser parts lower gearcase
Mercruiser Parts Lower Gearcase

Mercruiser lower unit, including Gen 1 models

1970 - 1990 models, serial numbers 2791957 - 0D469858

Alpha One Gen 2 Lower Unit

Alpha One Gen 2 Lower Unit

Generation 2 lower unit components

1991 - up models, serial numbers 0D469859 - up

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Upper Gear Cases
upper gearcase
Upper Gearcase

Upper gear case For MC-1, R, MR and Generation 1

1970 - 1990 models, serial numbers 2791957 - 0D469858

Alpha One Gen 2 Upper Unit

Gen 2 Upper Unit

1991 - Present models, serial numbers 0D469859 - up

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Bell Housing / Gimbal Housing
Bell housing layout

Bell Housing Layout

1970 - 1990 models, serial numbers 2791957 - 0D469858

Gen 2 Transom

Gen 2 Transom

Bell housing for Gen 2

1991 - present models, serial numbers 0D469859 and up