OMC Parts Drawing *Cobra *Mercruiser *Alpha SEI Outdrives

OMC Cobra seal kits & mounting gasket

Outdrive gasket and seal kits for years 1986 to 1993
 4 cylinder, V6 and V8 models

Last updated 11/03/2023

  • Seal and gasket kits for Cobra upper and lower units
  • Compatible with 4 cylinder, 2.3L, 3.0L and V6 and V8 models
  • Include gaskets, o-rings and oil seals
  • Water pump adapter for impeller shaft

OMC Cobra lower unit seal kits
Years 1986 to 1993

(Pricing) USA
(Pricing) USA
87656 OMC outdrive-lower unit seal kit
87656 V6 V8 OMC parts for lower gearcase
V6 and V8
5.0, 5.7 and 5.8 liter
Years 1986 to 1993
87656 Seal kit contains:
Gasket OEM 911878
Seal OEM 911705
Wiper OEM 912157
Gasket OEM 915719
O ring OEM 318717 (3)
O ring OEM 314728
O ring OEM 305123 (2)
O ring 1/4 inch (4)
Oil seals OEM 320862 (2)
Oil seals OEM 334950 (2)
Bolts 1/4 28 x 1 inch (4)
Gaskets OEM 311598
# 87656 $52.95

# 87656 $89.89

OMC Cobra sterndrive lower unit 46 to 59

87655 lower gearcase 4 Cylinder 2.3 liter

87655 Seal kit contains:
Seal OEM 911705
O ring OEM 318717 (3)
O ring OEM 314728
O ring OEM 313446 (2)
O ring 1/4 inch (4)
Oil seals OEM 330137 (2)
Wiper OEM 912157
Screws 1/4 28 x 1″ (4)
Gaskets OEM 311598)
Gasket OEM 911878
Gasket OEM 915719
# 87655 $31.95

# 87655 $47.89

OMC Cobra Stern Drive Seal kit & Gaskets, 34720 Water passage gasket

34720 Water passage gasket

Note water passage gasket requires two coats of aviation gasket compound so as not to be burned by exhaust gas.
Gasket is included in 87656 seal kit.
# 34720 $4.95

# 34720 $4.89

OMC Cobra Stern Drive Seal kit & Gaskets

87750 OMC SX lower seal kit

# 87750 $24.95
# 87750 $32.95

OMC Cobra upper gearcase seal kits
1986 to 1993

(Pricing) USA
(Pricing) USA
OMC Cobra upper gearcase parts, 87654 OMC Cobra upper gearcase

87654 OMC Cobra upper gearcase seal kit

P/N 87654 OMC Cobra Seal kit / 987603, 986364 
Includes the following.
81180 O-ring
82380 O-ring
82430 O-ring
81280 O-ring
86530 Oil seal (large)
86610 Oil seal (small)
34730 Gasket
33910 Gasket
34771 Gasket
81100 O-Ring

# 87654 $41.95

# 87654 $70.89

27900 Cobra water pump adaptor

27900 Water pump adaptor

This unit comes with oil seal installed

# 27900 $82.95

# 27900 $128.89

OMC Cobra Stern Drive Seal kit & Gaskets

87740 SX Kit Upper

87740 SX Kit Upper

# 87740 $40.95

# 87740 $81.89

OMC Cobra outdrive installation kits years 1986 to 1993

OMC Cobra Stern Drive Seal kit & Gaskets

39630 Cobra sterndrive installation kit.

39630 Cobra outdrive installation gasket kit.
  • 34730 Gasket OEM 915850
  • 86300 Seal OEM 911823
  • 81180 O-ring OEM 911851

# 39630 $9.95

# 39630 $6.89

Loctite gasket and Loctite retainer compound

508235 Evinrude/Johnson gasket sealing compound
508235 Evinrude/Johnson gasket sealing compound.
Can use Loctite gasket compound as substituted.

# 508235 $32.95

# 508235 $42.89

OMC Stern Drive Seal compound 68015 Loctite .020 gap for installing seals.

68015 Loctite .020 gap for installing seals

Loctite 680 is used on the outside of the bearing carrier oil seals.
# 68015 $29.59

# 68015 $33.89