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Mercruiser Alpha 1 Gen 2 lower unit parts drawing

Alpha One lower unit gearcase housing exploded view drawing

Last updated on 11/26/2023

  • MerCruiser and Alpha One (up to 1990) exploded view lower unit parts drawing
  • Water pump components, impellers, seals, shafts and gear sets
  • Manufactured by GLM, California. All parts include a 2 year warranty
  • Easy to identify photos with OEM Mercury numbers
Mercruiser Alpha 1 Gen 2 lower unit parts

Mercruiser Alpha 1 Gen 2 lower unit

Upper Housing

Description
OEM number

Price
(USD)

Price (Canadian)

Mercruiser Alpha 1 Gen 2 lower unit parts

SEI Mercruiser Alpha 1 Gen 2 lower unit

Item 1
SEI SE116
 Aftermarket SEI lower unit Mercruiser Alpha One Gen 2 aftermarket lower unit. For 1991 and up models only, serial numbers OD470000-Up, For 4 cylinder, V6 and V8 models up to 300 horsepower. Will not replace 2.00 or 2.40 ratio units.

$1199.99

$1599.89

face seal

85590 Face seal

#2 Face seal 26-816575A2

$4.95

$6.89

water pump impeller

89630 Mercruiser water pump impeller

#3 Impeller 47-43026T2

$15.95

$26.89

gasket

31240 Gasket

#4 Gasket 27-817277-1

$4.95

$4.89

Mercruiser Alpha 1 Gen 2 lower unit parts

12500 Face plate

#5 Face plate 817276-1

$6.95

$10.89

Mercruiser Alpha 1 Gen 2 lower unit parts

30090 Gasket

#6 Gasket 27-43033-1

$4.95

$4.89

Mercruiser Alpha 1 Gen 2 lower unit parts

81390 O-ring

#7 O-ring 25-90011

$4.95

$4.89

Mercruiser Alpha 1 Gen 2 lower unit parts

85011 Oil seal

#8 Oil seal 26-66302

$8.95