Mercruiser Outdrive Parts Drawings *How to Videos

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Mercruiser seal kit *Upper gearcase *Lower unit

GLM Aftermarket outdrive seal kits *4 cylinder *6 cylinder and V8 models

  • Seal kits for upper and lower unit 4 cylinder, 6 cylinder and V8 Mercruiser outdrives
  • Oil seals should be installed with Loctite # 680, or # 609 green retaining compound or Evinrude/Johnson gasket sealing compound (part number 508235)
  • Parts used when installing seals must be cleaned by wire brushing or sanding with emery cloth. Oil or finger print deposits should be cleaned with lacquer thinner
  • Note : Loctite holds better when pressure testing unit within 1 hr. Contact our service tech and see our tools page for help with installation
  • For water pump and impellers, see our water pump page

Tech support Exploded view Mercruiser drawings
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1967 - 1990 (1 / R / MR / Alpha 1)

87500 Upper gearcase Mercruiser

87500 Upper gearcase Mercruiser

P/N GLM 87500 26-32511A1 Upper gearcase $24.00
M1 / R / MR / Alpha 1 (1964 - 1990) serial numbers 1684188 - OD469858 Includes:
# 80420 O-ring # 25-32546
# 80190 O-ring # 25-55801
# 81180 O-ring # 25-25439
# 82380 O-ring # 25-70937
# 85020/85060/85030 Oil seals # 26-32511/26-96503/26-823894
# 31150 Gasket # 27-55810-1
# 85150 Grommet # 26-36557

18-2648

18-2648

P/N Sierra 18-2648 OEM 26-32511A1 $43.00

87510 lower seal kit

87510 lower seal kit

P/N GLM 87510 OEM 26-33144A2 Lower unit seal kit $38.95 M1 / R / MR / Alpha 1 years 1964 to 1990 Serial numbers 1684188 - OD469858

18-2652

18-2652

P/N Sierra 18-2652 OEM 26-33144A2 $49.00

87500 87510 Complete outdrive 1970-1990

87500 87510 Complete outdrive 1970-1990

P/N GLM 500-510 Complete upper-lower stern drive years 1964 to 1990) $60.00
Includes #87500 and #87510

88010 Water pump outdrive

88010 Water pump outdrive

P/N 88010 Housing, impeller, outdrive upper and lower seal sets $99.00
Compatible with models 1 and R. Years 1970 to 1983 serial numbers 2663442 - 6225576

88020 - 1984-1990

88020 - 1984-1990

P/N 88020 Water pump parts and stern drive seal kits $99.00
Alpha 1 years 1984 to 1990 S/N 6225577 - OD469858 *Includes all seals for upper and lower unit.

39622 Bell housing gasket

39622 Bell housing gasket

P/N 39622 27-94996T2 Bell housing gasket set (1983 and up) $9.15
For R / MR / Alpha 1 and Gen 2

 

P/N 39590 27-64818T4 Bell housing gasket (1967 - 1982) $5.00
For M1 all 4 / 6 / 8 cylinder models

 

1991 - 2012 (Alpha 1 Generation 2)

87501 Alpha 1 Gen 2 oil gaskets

87501 Alpha 1 Gen 2 oil gaskets

P/N GLM 87501 26-88397A1 Upper unit $25.95
Alpha 1 Generation 2 (1991 and up)
Serial numbers OD469859 - up

18-2644

18-2644

P/N Sierra 18-2644 26-88397A1 $26.00

87511 1991-2012

87511 1991-2012

P/N 87511 26-816575A3 Lower gearcase $45.00
Alpha 1 Generation 2 (1991 and up)
Serial numbers OD469859 - up

18-2646

18-2646

P/N Sierra 18-2646 26-816575A3 $66.00

87501 87511 Sterndrive o-ring gaskets 1991 up

87501 87511 Sterndrive o-ring gaskets 1991 up

P/N GLM 501-511 Complete Alpha 1 (Gen 2 1991 and up) $69.95
Includes #87501 and #87511

 

1983 - 2012 (R / MR / Alpha 1 / Gen 2)

87400 Trim cylinder o-rings

87400 Trim cylinder o-rings

P/N GLM 87400 Power trim cylinder (1983 and up) $17.95
Includes all o rings for 1 trim cylinder. *2 required for both port and stbd. M-1/ R / MR / Alpha 1 serial numbers 6225577 and up