Alpha One Gen.1 (bottom Gear)

MerCruiser Alpha One Gear spare parts (Lower Unit)

MerCruiser Alpha One Gear spare parts are crucial for the reliable functioning of the Z-drive. In this category you will find suitable components for the maintenance, repair and servicing of the MerCruiser Alpha One gear - from seals and bearings to other drive parts. All spare parts are designed for high accuracy of fit and long-lasting use in the marine sector.
Original spare part
Sealing ring oil cap for Mercruiser / Mercury / OMC, 191833
Mercury-Mercruiser-Quicksilver
Sealing ring oil cap for Mercruiser / Mercury / OMC, 191833
article nr.03887

Sealing ring (oil screw) for Alpha Z-drives and outboards
Mercruiser No. 12-191833

1,22 EUR / Piece
(2)
incl. 19% VAT
Lieferung Wed 05. Aug - Mon 10. Aug 2026 **
24 months statutory warranty
Original spare part
Bottom oil drain plug for Mercruiser / Volvo Penta / OMC, 8M0058389
Mercury-Mercruiser-Quicksilver
Bottom oil drain plug for Mercruiser / Volvo Penta / OMC, 8M0058389
article nr.02331

Mercruiser ref. no. 67892A05 8M0058389, Volvo Penta ref. no. 3854539, OMC ref. no. 318544

10,72 EUR
incl. 19% VAT
Lieferung Wed 05. Aug - Mon 10. Aug 2026 **
24 months statutory warranty
Original spare part
Sealing ring for Z-drive oil channel, MD26-455771 Sealing ring for Z-drive oil channel, MD26-455771
Mercury-Mercruiser-Quicksilver
Sealing ring for Z-drive oil channel, MD26-455771
article nr.04409

Sealing ring (oil channel underwater part) for Mercruiser up to Alpha One Gen.2
Mercruiser ref. no. 26-455771, 8M0204680

3,48 EUR / Piece
incl. 19% VAT
Lieferung Wed 05. Aug - Mon 10. Aug 2026 **
24 months statutory warranty
Original spare part
Ground strap set for Mercruiser Z-drives 99940A2
Mercury-Mercruiser-Quicksilver
Ground strap set for Mercruiser Z-drives 99940A2
article nr.04922

for all common Mercruiser Z-drives (see details)

48,89 EUR / Set
incl. 19% VAT
Lieferung Wed 05. Aug - Mon 10. Aug 2026 **
24 months statutory warranty
Propeller nut set for Mercruiser Alpha/Bravo, MD52707Q1
Propeller nut set for Mercruiser Alpha/Bravo, MD52707Q1
article nr.02338

Propeller nut with 2 lock washers for all Mercruiser Alpha and Bravo models (except Bravo 3) and all Mercury/Mariner V6 models (including Sea Pro, Marathon and Bigfoot) 60 - 275 hp.
Mercruiser ref. no. 52707Q1, 52707A1

25,08 EUR / Set
incl. 19% VAT
Lieferung Wed 05. Aug - Mon 10. Aug 2026 **
24 months statutory warranty
Original spare part
O-ring for Z-drive universal joint shaft, MD30613
Mercury-Mercruiser-Quicksilver
O-ring for Z-drive universal joint shaft, MD30613
article nr.03876

Mercruiser ref. no. 25-30613, Volvo Penta / OMC ref. no. 997368, 3852565

1,59 EUR / Piece
incl. 19% VAT
Lieferung Wed 05. Aug - Mon 10. Aug 2026 **
24 months statutory warranty
Original spare part
Impeller pump repair kit for Mercruiser Alpha One, 96148A8
Mercury-Mercruiser-Quicksilver
Impeller pump repair kit for Mercruiser Alpha One, 96148A8
article nr.03417

Repair kit with upper housing for Mercruiser R, MR and Alpha One Gen.1.
Mercruiser No. 46-96148A8

86,35 EUR / Set
incl. 19% VAT
Lieferung Wed 05. Aug - Mon 10. Aug 2026 **
24 months statutory warranty
Impeller pump repair kit for Mercruiser Alpha One, MD89984Q5
Impeller pump repair kit for Mercruiser Alpha One, MD89984Q5
article nr.04707

Impeller pump repair kit for MerCruiser Z-drives MC-I, MR and Alpha One and Mercury / Mariner. Outboard engines.
Mercruiser Ref-No.: 47-89984T5, 47-89984Q5

29,93 EUR / Set
incl. 19% VAT
Lieferung Wed 05. Aug - Mon 10. Aug 2026 **
24 months statutory warranty
O-ring for Mercruiser / OMC, MD25-32546
O-ring for Mercruiser / OMC, MD25-32546
article nr.03858

Mercruiser ref. no. 25-32546, OMC ref. no. 508674,

6,70 EUR / Piece
incl. 19% VAT
Lieferung Wed 05. Aug - Mon 10. Aug 2026 **
24 months statutory warranty
Original spare part
O-ring for Mercruiser / OMC Z-drives, 70937
Mercury-Mercruiser-Quicksilver
O-ring for Mercruiser / OMC Z-drives, 70937
article nr.03881

Mercruiser No. 25-70937

6,04 EUR / Piece
incl. 19% VAT
Lieferung Wed 05. Aug - Mon 10. Aug 2026 **
24 months statutory warranty
Impeller for Mercruiser Alpha One Gen 1, MD89984T4 Impeller for Mercruiser Alpha One Gen 1, MD89984T4
Impeller for Mercruiser Alpha One Gen 1, MD89984T4
article nr.04708

Impeller for MerCruiser Z-drives MC-I, MR and Alpha One
Mercruiser ref. no. 47-89984T4

30,53 EUR / Piece
incl. 19% VAT
Lieferung Wed 05. Aug - Mon 10. Aug 2026 **
24 months statutory warranty
Gasket set underwater part for Mercruiser Alpha One Gen.1, MD33144A2
Gasket set underwater part for Mercruiser Alpha One Gen.1, MD33144A2
article nr.02908

Mercruiser ref. no. 26-33144A2

40,54 EUR / Set
incl. 19% VAT
Lieferung Wed 05. Aug - Mon 10. Aug 2026 **
24 months statutory warranty
Stainless steel nut for Mercruiser / OMC / Volvo Penta, MD8267089
Stainless steel nut for Mercruiser / OMC / Volvo Penta, MD8267089
article nr.02343

Mercruiser ref. no. 11-8267089, Volvo Penta ref. no. 3852005

7,78 EUR / Piece
incl. 19% VAT
Lieferung Wed 05. Aug - Mon 10. Aug 2026 **
24 months statutory warranty
O-ring 25-25439
Recmar
O-ring 25-25439
article nr.REC25-25439

O-RING

7,59 EUR / Piece
incl. 19% VAT
Lieferung Wed 05. Aug - Mon 10. Aug 2026 **
24 months statutory warranty
Shift shaft fitting for Mercruiser Alpha One, MD30617A2
Shift shaft fitting for Mercruiser Alpha One, MD30617A2
article nr.02348

Mercruiser ref. no. 23-30617A2

12,90 EUR
incl. 19% VAT
Lieferung Wed 05. Aug - Mon 10. Aug 2026 **
24 months statutory warranty
Original spare part
Aluminum anode kit for transom mounting for Mercruiser Alpha One Gen1, R/MR 1984-1990 , 8M0030655
Mercury-Mercruiser-Quicksilver
Aluminum anode kit for transom mounting for Mercruiser Alpha One Gen1, R/MR 1984-1990 , 8M0030655
article nr.09802
74,94 EUR / Set
incl. 19% VAT
Lieferung Wed 05. Aug - Mon 10. Aug 2026 **
24 months statutory warranty
Original spare part
Locating washer for Mercruiser locking plate, MD31211Q03
Mercury-Mercruiser-Quicksilver
Locating washer for Mercruiser locking plate, MD31211Q03
article nr.02334

For MC1, R, MR, Alpha One Gen1 / Gen2. and Bravo One.
Mercruiser Ref. no. 31211Q03

18,36 EUR
incl. 19% VAT
Lieferung Wed 05. Aug - Mon 10. Aug 2026 **
24 months statutory warranty
Original spare part
Needle bearing for Mercuiser Alpha One, 30956T
Mercury-Mercruiser-Quicksilver
Needle bearing for Mercuiser Alpha One, 30956T
article nr.02340

Needle roller bearing for propeller shaft carrier (Bearing Carrier)
Mercruiser Ref. No. 31-30956T

24,27 EUR
incl. 19% VAT
Lieferung Wed 05. Aug - Mon 10. Aug 2026 **
24 months statutory warranty
Original spare part
Water inlet strainer for Mercruiser Alpha port, MD934241
Mercury-Mercruiser-Quicksilver
Water inlet strainer for Mercruiser Alpha port, MD934241
article nr.02328

Water Pick Up Inserts Port.
Mercruiser Ref. no.: 934241

7,15 EUR
incl. 19% VAT
Lieferung Wed 05. Aug - Mon 10. Aug 2026 **
24 months statutory warranty
Original spare part
Carrier nut for Mercruiser Z-drives, 8M0168577
Mercury-Mercruiser-Quicksilver
Carrier nut for Mercruiser Z-drives, 8M0168577
article nr.02349

Mercruiser ref. no. 52834, 79448, 8M0168577, 8M2000347, 8M2011027

51,01 EUR
incl. 19% VAT
Lieferung Wed 05. Aug - Mon 10. Aug 2026 **
24 months statutory warranty
Displaying 1 to 20 (of 35 products)
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    Over 15 years’ experience in the marine spare parts trade
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    Official Mercury & MerCruiser dealer
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    A wide range of boat engine spare parts from A to Z
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    Spare parts for Volvo Penta, MerCruiser, Yamaha, Honda, Suzuki and more
  • Fast delivery for maintenance, servicing and repairs
    Fast delivery for maintenance, servicing and repairs
  • Order boat spare parts conveniently online 24/7
    Order boat spare parts conveniently online 24/7

The MerCruiser Alpha One Z-drive is one of the most frequently used sterndrive systems in the leisure boat sector worldwide. Regular maintenance and the timely replacement of worn components are crucial to ensure the long-term performance and operational reliability of the drive system.

Important components of the Alpha One gearbox

The gearbox of the MerCruiser Alpha One drive consists of numerous precisely matched components. Particularly stressed components are

  • Gearbox seals

  • Bearings and shaft seals

  • Gear wheels and transmission components

  • Drive shafts

  • Seal kits for maintenance and repair

During operation, these parts are subject to high mechanical loads and permanent contact with water and lubricants.

Typical causes of wear in the Alpha One drive

Wear on the MerCruiser Alpha One Gear is primarily caused by

  • high torques in the drivetrain

  • long-term stress on the bearings and gears

  • Water ingress due to damaged seals

  • insufficient maintenance intervals

Early replacement of critical components prevents consequential damage to the entire Z-drive.

Suitable spare parts for maintenance and repair

In the Marine-Discount24 range you will find a large selection of MerCruiser Alpha One Gear spare parts for various years of construction and drive generations. The components on offer are specially tailored to the requirements of MerCruiser drives and enable precise repair of the transmission system.

Typical areas of application:

  • Gearbox overhaul

  • Replacement of worn seals

  • Maintenance of drive shafts

  • Repair of bearings in the gear housing

Spare parts for MerCruiser drives at Marine-Discount24

Marine-Discount24 offers an extensive range of MerCruiser spare parts for Alpha and Bravo drives. Thanks to clear categorization, suitable components for maintenance, repair and servicing can be found quickly.

Advantages:

  • Large selection of compatible spare parts

  • Suitable components for many MerCruiser models

  • Reliable spare parts supply for Sterndrive drives

  • Fast shipping and professional processing

This ensures that your MerCruiser Alpha One drive remains efficient and ready for use in the long term.