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

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Mercruiser Alpha One water pump and seal kit

Upper / lower unit rebuild kit
with seals and water pump

  • Compatible with MR and Alpha 1 (Generation 1) Mercruiser outdrive models
  • Use with years 1984 - 1990 (serial numbers 6854393 - OD469858)
  • Kit includes all seals, o rings, gaskets and water pump assembly for the upper and lower unit stern drive
  • When installing o rings and gaskets, make sure to use a gasket sealant (shown below)
  • For outdrive seal sets, click here

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88020 Water Pump Seal Kit

88020

P/N 88020 Water Pump and Outdrive Sealing Kit $140.95

Parts included:

P/N 12410 46-96148T1 Housing
P/N 12322 46-44292A3 Pump base
P/N 89840 47-89984T4 Impeller
P/N 12810 48752 Cup
P/N 11070 28-56654 Key
P/N 12820 23-29804T Guide tube
P/N 12510 32435 Wear plate
P/N 31010 27-85608-1 Gasket
P/N 81160 25-3061 O ring
P/N 81390 25-90011
P/N 81180 25-25439
P/N 31020 25-858524 Gasket
P/N 31010 27-85608-1
P/N 31050 27-42631-1
P/N 85040 26-16977 Oil seal
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 25-30271
P/N 80420 25-32546 O-Ring
P/N 80190 25-55801
P/N 81180 25-25439
P/N 82380 25-70937
P/N 85020 26-32511 Oil seal
P/N 85060 26-96503
P/N 85030 26-823894
P/N 31150 27-55810-1
P/N 85150 26-36557

87510

87510

P/N GLM 87510 OEM 26-33144A2 Lower unit set $42.00

87500

87500

P/N 87500 26-32511A1 Upper gearcase $24.00

89840 Impeller 47-89984T4

89840 Impeller 47-89984T4

P/N 89840 OEM 47-89984T4 Impeller $15.15

12810 cup

12810 cup

P/N 12810 48752 Cup $6.15

12410

12410

P/N 12410 46-96148T1 Housing $29.15

12310

12310

P/N 12322 46-44292A3 Pump base $25.15

11070 Key 28-56654

11070 Key 28-56654

P/N 11070 28-56654 Key $4.15

12820 Tube guide 23-29804T

12820 Tube guide 23-29804T

P/N 12820 23-29804T Guide tube $4.15

12510

12510

P/N 12510 32435 Wear plate $4.15

31020 Base gasket OEM 27-858524

31020 Base gasket OEM 27-858524

P/N 31010 OEM 27-85608-1 Gasket $4.15

Customers who ordered P/N 88020 also purchased:

317201 16 Ounce sealant

317201 Sealant Large 16 ounce

P/N 317201 Same sealing compound as above. 16 ounce. $24.15

Water pump kit 12120

Water pump kit

P/N 12120 Lower unit impeller kit with housing for Alpha 1, 1984-1990 models. Replaces Sierra 18-3320. $35.95