Mercruiser Alpha 1 seal kit and generation 2 parts

Upper gearcase/lower unit outdrive rebuild kits

Last updated on 8/12/2023, 1:17:46 AM

  • Mercruiser Alpha One Gen 1, r mr upper housing and lower gear case seal kits
  • Compatible with Alpha One (1984-1990) and Generation 2 (1991 and up) models
  • When installing gaskets and o-rings, make sure to use a sealing compound (shown below)
  • GLM, Sierra and Mallory Marine units available

1984 – 1990 – Serial Numbers 2062141 – 0D469858
see bottom of page for Generation 2, 1991 and up

Lower Unit

87510 Mercruiser seal kit Alpha 1

P/N 87510 Most popular GLM seal kit – lower unit

Replaces Mercury part number 26-33144A2. 5 stars. $44.99

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

18-2652

P/N 18-2652 Sierra. Replaces part number 26-33144A2. $59.99

9-74304

P/N 9-74304 Mallory. 26-33144A2. $51.15

88020 Water Pump Stern Drive

P/N 88020 GLM Stern drive rebuild set. Includes all water pump assembly and all seals, gaskets and o-rings. OEM 26-32511A1, 26-33144A2 and 46-44292A5. $119.99

(1984 – 1990) – Serial Numbers 2062141 – 0D469858
(see bottom of page for Generation 2, 1991 and up)

Upper Gear Case

87500 GLM aftermarket Mercruiser upper gearcase seal kit

P/N 87500 GLM gasket set for upper housing. Replaces Mercury part number 26-32511A1. $24.95 Most popular

Sierra 18-2648

P/N 18-2648 Sierra. Replaces 26-32511A1. $43.15

9-74303

P/N 9-74303 Mallory Marine. 26-32511A1. $49.15

500-510

P/N 87500-87510 GLM Complete outdrive (upper and lower) set. OEM 26-32511A1 and 26-33144A2. $69.99

Alpha 1 Generation 2 (1991 – Up) – Serial Numbers 0D469859 – Up

Lower Unit

Gen 2 26-816575A3

P/N 87511 GLM Marine gasket set. Replaces Mercury 26-816575A3. $41.99 Most popular

18-2646 Alpha 1 generation 2 seal kit

P/N 18-2646 Sierra. Replaces 26-816575A3. $66.15

9-74206

P/N 9-74206 GLM Mallory. 26-816575A3. $66.15

87501 87511 Complete Outdrive

P/N 87501-87511 GLM Complete upper and lower set.
#26-816575A3 and 26-88397A1. $69.95

Alpha 1 Generation 2 (1991 – Up) – Serial Numbers 0D469859 – Up

Upper Housing

26-88397A1

P/N 87501 GLM Upper housing gasket set. Replaces Mercury 26-88397A1. $29.99 Most popular

Sierra 18-2644 Alpha 1 gen 2 upper seal kit

P/N 18-2644 GLM Sierra. Replaces OEM 26-88397A1. $26.15

9-74302

P/N 9-74302 Mallory Marine. 26-88397A1. $36.15

Bell Housing and Trim Cylinder

39622 Bell Housing Installation Gasket 27-94996T2

P/N 39622 Stern drive installation to bell housing gasket and parts.
27-94996T2. $9.95

87400 O-Rings Trim Cylinder 25-87400A2

P/N 87400 O-rings for Mercruiser trim cylinders 1983 and up.
OEM 25-87400A2. $21.99

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12120

P/N 12120 Lower gear case water pump impeller kit rebuild kit, with housing. Compatible with 1984-1990 models. Replaces Sierra 18-3320. $42.99

21450

P/N 21450 Lower unit shift cable. Compatible with all models 1972 and up. Note, this cable installs from the AFT end of the bell housing, some minor modifications may be required on older model housings. Replaces Mercury 865436A03 and Sierra kit 18-2603. $89.99

Kit includes:
P/N 21710 Shift Cable 41951A1
P/N 21750 Set Screw 10-45590
P/N 21790 Bellow Clip 54-38863
P/N 21791 Hose Clamp 54-85504320
P/N 39622 Gasket Kit 27-94996A2
P/N 89080 74639 Bellow
P/N 21085 Slide w/ Screw 850752-1
P/N 21140 Shift Arm 45518A2
P/N 21430 Guide 43433
P/N 21432 Anchor 43436
P/N 21433 Set Screw 10-20518
P/N 21462 Wrapping 38473
P/N 21463 Insert 14705

12043

P/N 12043 Alpha generation 2 impeller water pump kit $44.99

Parts included:

P/N 89630 Impeller
P/N 12824 Coupling assembly
P/N 12500 Wear plate
P/N 31240 Gasket
P/N 30090  Gasket
P/N 82110 O Ring Seal

21960

P/N 21960 Sterndrive Generation 2 bellows kit with sealed gimbal bearing,oil seal and bellows gasket. Drive shaft bellows includes internal aluminum sleeve. For 1991 and up models only. Replaces Mercury part number 30-803099T1 $169.99

21950

P/N 21950 Sterndrive exhaust bellows kit Years 1973 thru 1990 with serial numbers 3469428 to 0D469800. OEM part number 30-803097T1 $149.99

Includes:

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

12110

P/N 11210 Outdrive upper unit gear set, ratio 20/22. Replaces Mercury 43-18411A2 $444.95

Includes P/N 21560 roller bearing 31-32573A1. Upper gears compatible with all V8 outdrives (1971 – 1990) and Alpha One gen ii models 1991-1997. 1.50 or 1.47 ratio Serial numbers 3106717 – 0K999999. For 1998 and up models, use P/N 11214.