Alpha 1 & Gen. 2 Outdrive Parts *Drawings *Videos

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Mercruiser Alpha One gearcase (new lower unit)

Lower unit gear housing assembly replacement from GLM Marine aftermarket parts

  • New complete lower unit gear housing assembly replacement
  • Forward bearing size: O.D 3.500 (#21590)
  • Heavy duty construction replaces original Mercruiser and Alpha 1 (One) and Gen 2 lower units
  • OEM 1623-8951A43
  • GLM P/N 18100 for 1970-1990 models, and P/N 18300 for 1991 and up (Alpha Gen 2 models)
  • Gear ratio: 13:21
  • See our Alpha 1 lower unit page for all lower gear case parts and components with photos
  • Tech support exploded view drawings search by part number or description here

lower unit complete

lower unit complete

gearcase assembly

gearcase assembly

prop shaft lower

prop shaft lower

P/N 18100 Mercruiser R/MR/Alpha One Gen 1 complete lower units. For 1970 - 1990 models, serial numbers 2791957-0A54000.

$1399.95 (no core required)

P/N 18300 Alpha One Gen 1 Generation 2 complete lower units. For 1991 and up models, serial numbers 0A545004-Up.

$1617.95 (no core required)

 

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51140 Mercruiser Alpha One exhaust manifold elbow 807988Q03

51140 Exhaust manifold elbow

P/N 51140 Mercruiser Alpha One exhaust manifold elbow/riser $143.95

Includes:
P/N 30240 Elbow/riser gasket
P/N 21892 plug
P/N 22379 plug
P/N 22381 x 4 mounting bolts

12120 Mercruiser Alpha One water pump impeller kit

12120 water pump 46-44292A5

P/N 12120 Mercruiser Alpha One water pump kit with housing - years 1984 - 1990 Serial numbers 6854393 - OD469858 $35.95

Includes:
P/N 12322 / 46-44292A3 Pump base
P/N 89840 / 47-89984T4 Impeller
P/N 12410 / 46-96148T1 Housing
P/N 12510 / 32435 Wear plate
P/N 12820 / 23-29804T Guide tube
P/N 11070 / 28-56654 Key
P/N 12810 / 48752 Cup
P/N 31010 / 27-85608-1 Gasket

21950 Mercruiser Alpha One transom bellows kit 30-803097T1

21950 Bellows kit

P/N 21950 Transom Mercruiser Alpha One bellows kit (1973-1990), serial numbers 3469428 - 0D469800. 30-803097T1 $145.95

Includes:
P/N 89100 exhaust bellow
P/N 89050 drive shaft bellow
P/N 21906 Gimbal bearing
P/N 39622 bell housing gasket
P/N 47110/47120 water hoses
P/N 89080 shift cable bellow
P/N 85910 oil seal

87511 Mercruiser Alpha One Gen 2 seal kit 26-816575A3

87511 Seal kit 26-816575A3

P/N 87511 Mercruiser Alpha One seal kit, replaces 26-816575A3 Alpha 1 Generation 2 (1991 and up) Serial numbers OD469859 - up. $35.95

12043 Mercruiser Alpha One Gen 2 impeller kit 47-43026Q06

12043 Impeller kit

P/N 12043 Alpha One Gen 2 impeller kit with coupling for Gen 2 Alpha 1 Generation 2 (1991 and up) Serial numbers OD469859 and up. *Does not include housing. $37.95

Included:
P/N 89630 / 47-43026T2 Impeller
P/N 12824 / 816597A1 Coupling assembly
P/N 85590 / 26-816575A2 Seal
P/N 12500 / 817276-1 Wear plate
P/N 30090 / 27-43033-1 Gasket
P/N 82110 / 25-21836 O Ring
P/N 31240 / 27-817277 Gasket

89100 Mercruiser Alpha One Exhaust bellow 18654A1

89100 Exhaust bellow 18654A1

P/N 89100 Mercruiser Alpha One exhaust bellow with hose clamps and grounding clips. Replaces 18654A1 or Sierra 18-2750 $22.95

21450 Mercruiser Alpha One shift cable 865436A03

21450 Shift cable 865436A03

P/N 21450 Mercruiser Alpha One shift cable. Updated cable with larger core wire. Compatible with 1967 - present Mercruiser and Alpha 1 and Gen 2 models. OEM 865436A03 $89.95

88010 Mercruiser rebuild kit

88010 Mercruiser rebuild kit

P/N 88010 Outdrive service kit for MC-1/R 1970 - 1983 $99.95

Parts included:
P/N 12110 Water pump impeller kit
P/N 87500 Upper housing seal kit
P/N 87510 Lower unit seal kit

88020 Mercruiser Alpha One rebuild kit

88020 Alpha One rebuild kit

P/N 88020 Outdrive service kit for MR/Alpha 1 1984-1990 $99.95

Parts included:
P/N 87500 Upper housing seal kit
P/N 12120 Water pump impeller kit
P/N 87510 Lower unit seal kit

87510 Mercruiser Alpha One seal gasket kit 26-33144A2

87510 Mercruiser Alpha One seal gasket kit 26-33144A2

P/N 87510 Mercruiser Alpha One outdrive seal kit for 1967-1990 (s/n 2062141 - 0D469800) $38.95

Includes:
P/N 21330 Slinger 25-30271
P/N 21010 bushing assembly 23-30617A2
P/N 85040 Oil seal 26-16977
P/N 12830 Seal 25-39970
P/N 81160 O-ring 25-30613
P/N 85070 Oil seal 26-89238
P/N 81390 O-ring 25-90011
P/N 81180 O-ring 25-25439
P/N 31020 Gasket 25-858524
P/N 31050 Gasket 27-42631-1
P/N 31010 Gasket 27-85608-1
P/N 85700 Oil seal 26-12224
P/N 85581 Oil seal 26-816464
P/N 85140 Seal 26-45577-1

87500 Mercruiser Alpha One upper gearcase seal kit 26-32511A1

87500 Seal kit 26-32511A1

P/N 87500 Mercruiser Alpha One upper gearcase seal kit. Replaces 26-32511A1. For M1 / R / MR / Alpha 1 (1964 - 1990) serial numbers 1684188 - OD469858 $24.95

Includes:
P/N 85150 Grommet
P/N 85020/85060/85030 Oil seals
P/N 80420 O-ring P/N 80190 O-ring
P/N 81180 O-ring P/N 82380 O-ring
P/N 31150 Gasket

39622 Mercruiser Alpha One bell housing gasket 27-94996T2

39622

P/N 39622 Mercruiser bell housing gasket set (1983 and up, s/n 6225577 - up). For R / MR / Alpha 1 and Gen 2. $9.95

12110 Mercruiser Water pump kit 46-57234A3

12110

P/N 12110 Mercruiser water pump kit with housing. For years 1970 - 1983 Serial numbers 2763442 - 6854392 $39.95

Includes:
P/N 12410 / 46-96148T1 Pump housing
P/N 89840 / 47-89984T4 Impeller
P/N 12820 / 23-29804T Guide tube
P/N 11070 / 28-56654 Key
P/N 12310 / 46-57234T1 Pump base
P/N 12810 / 48752 Cup
P/N 12510 / 32435 Wear plate
P/N 31010 / 27-85608-1 Gasket