OMC Parts Drawing *Cobra *Mercruiser *Alpha SEI Outdrives

Upper / lower gearcase seal kit and installation gasket set for
4 cylinder, V6 and V8 outdrives

Last updated on 9/26/2023

  • Upper gear case and lower unit rebuild set for all V4, V6 and V8 models
  • Include all oil seals, gaskets and o rings
  • Mercruiser Alpha One or generation 2 models
  • Gasket compound is recommended
  • We ship anywhere in Canada and the USA

Lower Unit

Description / OEM #

Price
(USD)

Price (Canadian)

Mercruiser seal kits *R *MR *Alpha 1 *Gen 2

87511 Alpha 1 Gen 2 Gearcase seal kit

P/N 87511 Lower unit (1991 and up, serial numbers 0A54004 – up)
 
Kit includes:
12341 Pump base
30090 Gasket
31170 Gasket
31240 Gasket
80120 O-ring (2)
81175 O-ring (2)
82110 O-ring (2)
83445 O-ring
85130 Oil seal (2)
85140 Seal
85581 Oil seal
85590 Face seal
85700 Oil seal
OEM: 26-816575A3

$35.95

$ 60.89

Upper Gear Case

Description / OEM #

Price
(USD)

Price (Canadian)

Mercruiser seal kits *R *MR *Alpha 1 *Gen 2

87501 Gearcase seal kit

P/N 87501 For upper gear housing (1991 and up, serial numbers 0A54004 – up)
 
Kit includes:
12831 Grommet
31170 Gasket (2)
80420 O-ring
81180 O-ring (2)
82150 O-ring
82380 O-ring
85022 Oil seal
85030 Oil seal
85140 Seal
OEM:26-88397A1

$25.95

$ 43.89

ball bearings

25130 Alpha 1 Gen 2 Gearcase seal kit

Kit includes:
11190 Pinion nut
11381 Keyed washer
11410 Roller bearing
21580 T. Roller bearing
21590 T. Roller bearing
21610 Bearing
21620 Bearing
23210 Shim
23220 Shim
87511 Gearcase seal kit

 

OEM:31-803094T1

$203.95

$ 316.89

ball bearings, Seal Kits

25140 Gearcase seal kit

Kit includes:
11190 Pinion nut
11381 Keyed washer
11410 Roller bearing
21580 T. Roller bearing
21593 T. Roller bearing
21610 Bearing
21620 Bearing
23210 Shim
23221 Shim
87511 Gearcase seal kit

 

OEM: 31-803095T1

$217.95

$ 337.89

ball bearings, Seal Kits

25150 Gearcase seal kit

Kit includes:
11190 Pinion nut
11381 Keyed washer
11410 Roller bearing
21584 T. Roller bearing
21593 T. Roller bearing
21610 Bearing
21620 Bearing
23210 Shim
23221 Shim
87511 Gearcase seal kit

 

 

OEM: 31-803096T1

$211.95

$ 328.89

Transom Assembly Components

Price
(USD)

Price (Canadian)

Mercruiser seal kits *R *MR *Alpha 1 *Gen 2

32500 Gasket

Gasket

27-98823-1

$4.95

$4.89

32160 Gasket

Gasket, cover

27-99506-1

$4.95

$4.89

31470 Gasket

Gasket

27-476441

$4.95

$4.89

Bell Housing

Price
(USD)

Price (Canadian)

39622 Bell housing gasket kit

39622 Bell housing gasket

P/N 39622 Bell housing gasket set (1983 – present, serial numbers 6225577 and up)

27-94996T2

$4.95

$ 9.89

Compounds

Price
(USD)

Price (Canadian)

Engine water pump, M 508235 Engine Overhaul Gasket Set, 508235 OMC Johnson sealing compound

508235 OMC Johnson Compound - 16 OZ (471ml)

P/N 508235 Gasket compound – 16 FL. OZ (470 ml). This is used on the o-rings and gaskets when re-sealing the outdrive.

$29.95

$38.89

exhaust bellows, Seal Kits

508235 OMC Johnson Compound - 4 OZ (118ml)

P/N 508235 Gasket compound – 4 FL. OZ (118 ml). This is used on the o-rings and gaskets when re-sealing the outdrive.

$22.95

$27.89

outdrive tools

609 Loctite

P/N 609 609 Loctite for oil seals. Low viscosity and fast drying. Small tube is enough for one complete stern drive. Adds 3000 psi of holding power.

$9.95

$11.89

Mercruiser seal kits *R *MR *Alpha 1 *Gen 2

680 Loctite

P/N 680 680 Loctite. Highest retaining strength, adds 3700 psi of holding power. It is recommended to use the 680 instead of the 609 if you need to offset seals from original position onto a shaft. Small container is enough for a complete stern drive and future repair jobs.

$9.95

$11.89