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Alpha One & Gen 2 Outdrive Parts *Drawings *Videos

GLM Marine aftermarket Mercruiser parts

How To Mercruiser Outdrive Videos

Mercruiser Alpha One and Gen II tech support
Exploded view diagrams Click here
Printer friendly help pages

Search by part number or description here

Click image below for Mercruiser alpha parts

Outdrive gears upper gearcase


87510 Mercruiser or Alpha 1 lower gearcase seal kit

Seal Kits

Alpha one generation II lower parts drawing
Alpha one generation II lower parts drawing
21962S Transom service kit includes gimbal bearing oil seal

Bellows Kits

Water Pumps 12120

Water Pumps

89050 U Joint Bellow


21450 Gimbal housing shift cable repair kit

Shift Cable

Mercruiser Alpha 1 Gen. 2 upper gearcase parts drawing

Mercruiser Alpha One Gen II upper gearcase parts drawing

Propeller bearing carrier puller tool


25115 MC-1 and R seals bearings shims water pump gasket kit
Complete Seal and Bearing Kits
28040 External lock ring u joint

U Joints / Yokes

21590 forward gear OEM 31-35928T1
Mercruiser Alpha 1 Gen 2 bell housing components

Alpha 1 & Gen 2 bell housing parts layout

bearing carrier
11155 Alpha 1 prop shaft

Prop shaft

11120 Mercruiser Alpha One drive shaft

Drive shaft

Bell Housing Gimbal Bearing

Gimbal Bearing

Alpha One gimbal housing parts

Alpha One or gen 2 gimbal housing parts

Used Parts

Used Alpha One parts

12710 Alpha One anode trim tab

Anode trim tab

21970 Trim Hose Connector Kit

Trim Connectors

11520 Mercruiser marine engine coupler

Engine coupler

11100 Compatible with all 4 cylinder

Lower unit
pinion / forward gear

SEI Mercruiser Alpha One gen 2 outdrive

SEI Mercruiser Alpha One gen 2 outdrive

SEI-116 Mercruiser Alpha 1 gen 2 upper sterndrive

SEI Alpha 1 gen 2 upper

51210 Mercruiser exhaust manifold

Mercruiser exhaust manifold

11312 complete gear set OEM 43-878087A4

Complete lower gear set

39670 Mercruiser Ford 5.0 liter engine gasket kit

Engine gasket kit

Engine parts
Engine Components

Alpha One lower unit complete

Alpha lower unit rebuild kit

Alpha lower unit rebuild kit

11236 Mercruiser 1.84 or 1.81 ratio 17-19 years 1991-1997

11236 Upper service kit 17-19 gear ratio Gen. 2

Alpha One trim cylinders hoses

Trim cylinders and hoses

Mercury parts

Mercury Parts

Alpha One upper gearcase parts drawing

Alpha One upper gearcase parts drawing

Mercruiser Alpha One lower unit parts

Mercruiser Alpha One lower unit parts

Gearcase Repairs

Tech support includes repair cost for Mercruiser Alpha One and Generation 2 outdrives.


Tech support includes repair tools. Illustrations to identify outdrive components with technical support by phone.


48 hour service when required on outdrive units.

Special deal of the summer

Complete outdrive units now available from SEI aftermarket parts.

  • Mercruiser R Mr
  • Alpha One gen I
  • Alpha One gen II

Aluminum propeller all sizes

I Need Help Page

To identify parts page was added to help simplify locating drawings. Exploded view pages have illustrations and photos of each component.

Pages take time to download due to large detailed diagrams with 40 to 60 photos.

Sterndrive Tools

We stock tools for removal of components such as bearing carriers. Bearing retainers and special wrenches for outdrives.

Web pages listed dedicated to
  1. Alpha One years 1984 to 1990
  2. Alpha One Gen II years 1991 and up

Need more R MR sterndrive information or photos, please see the I need help drawings page.

Web site pages are designed for the factory certified technician, the boat mechanic or just boating enthusiasts performing their own repair work.

Drawings are divided into eight sections: upper gearcase, lower gearcase, Alpha One Gen II upper gearcase, lower gearcase, transom components, hydraulic hoses and the

Bell housing components.

  1. trim cylinder parts
  2. trim cylinders

GLM products are high quality cost effective aftermarket parts for sterndrive.

Tech support drawings illustrations

  • 65 repair video on YouTube
  • Help to identify Mercruiser and Alpha 1 or Generation 2
    and identify your Mercury and Yamaha lower units.

What's New ?

Seloc repair manuals for Chrysler, Force, Yamaha, Mariner, Mercury and Johnson outboards. Volvo penta, OMC stern drive books.

Sea water pumps GM V6 / V8 Engine thunderbolt IV and V distributors.

Delco ignition module-sensor assembly.

Repair tools

Coming Soon

Yamaha water pump kits and components with inboard / outboard engines.

Johnson pump OEM to GLM conversion table.

Click on GLM Catalog to see picture-listing.

Used Mercruiser Parts

We stock used stern drive components. We also stock used stern drives for the boating enthusiasts who wants to keep repair costs down.

GLM Products Inc Catalog

GLM Products Inc Catalog

GLM Catalog

Includes Crusader, Chris craft, Yamaha, OMC, Volvo, and Alpha One stern drive components with illustrations.

The online catalog is comprised of PDF files. In order to view them, you need Acrobat Reader.
You can download Acrobat Reader free from Adobe.

Once the catalog is opened on your screen, you can view pages by GLM number or print them.

Web Pricing

All web pricing in US funds