Mercruiser Alpha One Parts and Repairs

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Mercruiser Alpha One outdrive replacement or repair

Sterndrive replacement, repair and rebuild costs

  • Work performed on MC-1, R, MR (1970 -1983) and Alpha One outdrive (1984 - up) models
  • Upper gear case re-sealing, gear replacement and pressure testing
  • Lower unit seals, prop shaft and drive shaft changed
  • 4.3L V6, 120 / 140 models, V8 and inline 6 cylinder models
  • All sterndrive work is pressure tested 12 - 15 lbs overnight to ensure proper seal

 

Upper Gear Case Repairs

MC-1, MR and Alpha One and Gen 2 models (1970 - present)

 

Upper Oil Seal

Seals P/N 85020 (Mercury 26-32511) and P/N 85060 (Mercury 26-96503) are replaced in models up to 1990, oil seal P/N 85011 x 2 (Mercury 26-66302) for Gen 2 models from 1991 and up.

These seals provide a seal between the upper and lower unit. The lower gear case drive shaft slides up into the upper vertical gear. Worn seals may show leaks from this area and should be replaced as soon as discovered.

*If you are also noticing oil between the upper and lower unit, first make sure to check that the oil passage seal (P/N 85140, which is a small 1/8 inch diameter flat round rubber seal) is installed between the upper and lower unit.

$135 USD

$168 CDN

 

Drive Shaft / Yoke Oil Seal

Oil seal P/N 85030 (OEM 26-823894) and o-ring P/N 82380 (OEM 25-70937) are replaced for all models, all years.

These seals provide a seal for the horizontal yoke and main output drive shaft. Special tools are required to remove the retainer (OEM 816811-2) before the yoke and shaft assembly can be removed. New seal is installed with Loctite. *If you are noticing oil inside your drive shaft / u-joint bellows, this seal is most likely the cause.

*Please note, in certain instances, the yoke will need to be replaced if there is any damage or excessive wear on it. An additional $60 US ($75 Canadian) is required for the yoke.

$185 USD

$231.00 CDN

 

Full Rebuild with New Gears

Upper housing gears, all bearings, and seals / shims are replaced. Gears are shimmed to correct tolerances. For all models, all years.

Parts replaced (1970 - 1990 models):
P/N 11210, 11240, 11230, 11220 Gear set (depending on ratio / motor / model)
P/N 21520 Double bearing with spacer for horizontal shaft
P/N 21510
P/N 21540 
P/N 87500 Upper housing seal kit (includes all o-rings, oil seals and gaskets)
All shims
Parts replaced (1991 and up models):
P/N 11214, 11233, 11244, 11210, 11240, 11230, 11220 Gear set (depending on ratio / motor / model)
P/N 21520 or 21522 Double bearing with spacer
P/N 21511
P/N 21540 or 21560 Roller
P/N 87501 Gasket / seal kit
All shims

$799.00 USD

$998.00 CDN

 

Lower Unit Repairs

 

Basic Re-sealing

Lower unit oil seals, gaskets and o-rings are replaced. Prop shaft bearing is replaced. For all models, all years.

*Please note, if the propeller shaft is out of round by more than .004", it will need to be replaced.

Additional $399 USD ($498 Canadian) is required for prop shaft.

$365.00 USD

$456.00 CDN

 

Full Rebuild with New Gears

Lower unit gears, all bearings, and seals / shims are replaced. Gears are shimmed to correct tolerances. For all Mercruiser models, all years.

*Please note, if the propeller shaft is out of round by more than .004", it will need to be replaced.

Additional $489 USD ($638 Canadian) is required for prop shaft, in this case the cost may exceed the cost of a brand new lower unit. In some instances,

Brand new lower unit will be offered to the customer instead of rebuilding customer unit.


Parts replaced (1970 - present models):

11190 Pinion Nut
11300 or 11312 Gear Set (depending on model and year)
11380 Washer
11410 Roller Bearing
11420 Roller Bearing
21570
21590
21620 Bearing
23220 Shim
23300 Shim
87510 or 87511 Seal Kit

$899.00 - $959.00 USD
Choose model below for price

Model / Year

$1123.00- $1198.00 CDN
Choose model below for price

Model / Year