Mercruiser outdrive parts | Alpha one lower unit repairs

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Mercruiser outdrive repair cost *Alpha 1 lower unit

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
  • 4.3 liter 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 and lower unit exploded view Mercruiser gearcase repair parts

Upper Gear Case Repairs MC-1, MR, Alpha One
and Gen 2 models 1970 to present

85011 Oil seal

85011 Oil seal

85140 Seal

85140 Seal

85060 26-96503-1

85060 oil seal 26-96503-1

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.

85030 Oil seal
85030 Oil seal

28370 Alpha 1 gen 2 carrier assembly

28370 Alpha 1 gen 2 carrier assembly

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.

28310 Yoke
*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.

28310 Yoke

11210 Heavy duty gear set

11210 Heavy duty gear set

11220 Gear set

11220 Gear set

11240 Mercruiser Alpha 1 Gen 2

11240 Mercruiser Alpha 1 Gen 2

87501 Gearcase seal kit

87501 Gearcase seal kit

Full rebuild cost 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 for years 1970 to 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 21511P/N 21540 or 21560 Roller

P/N 87501 Gasket / seal kit and all shims

21520 Mercruiser Roller bearing kit

21520 Mercruiser Roller bearing kit

$799.00 USD

$998.00 CDN

 

Lower Unit Repairs

87510 Seal kit

87510 Seal kit

$365.00 USD

$456.00 CDN

Basic Mercruiser lower unit 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 .005", it should be replaced.

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

Mercruiser repair costs

Mercruiser repair costs

$899.00 - $959.00 USD
Rebuilt model below for price

Model / Year

$1123.00- $1198.00 CDN
New model below for price

Model / Year

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 .005", it should 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

Exploded view parts drawings

Exploded view parts drawings

28400 Cover Assembly
80420 O Ring
23260 Shim (For No. 21510 Bearing)
23261 Shim (For No. 21511 Bearing)
21510 Bearing Assembly (0.D. 1-15/16)
21511 Bearing Assembly (0.D. 1-25/32)
11130 Drive Shaft
80190 O Ring
11210 Gear Set (1.50 or 1.47 Ratio) (20-22)
21560 Roller Bearing (1. 50 Ratio)
23270 Shim
85020 Oil Seal
85060 Oil Seal
81180 O Ring
28050 U-Joint Assembly
28315 Yoke Assembly
28030 U-Joint
28100 Socket
28310 Yoke
28350 Retainer
28390 O Ring
82380 O Ring
28370 Carrier Assembly
85030 Oil Seal
21520 Roller Bearing (All Ratio Except 1.32)
21530 Roller Bearing (1. 32 Ratio)
23280 Shim
28380 Shim
28330 Washer
28360 Nut
22420 Screw
31170 Washer
28300 Screw
21890 Plug
21170 Nut
31150 Gasket
22440 Screw
12200 Water Pocket Cover Kit
21423 Bushing
85150 Grommet
12202 Water Tube
22031 Welch Plug (1-1/4 0. D.)
22032 Pipe Plug
85150 Grommet
21421 Intermediate Shift Shaft
21422 Washer
22100 Cotter Pin
87500 Gearcase Seal Kit
39622 Mounting Kit
39590 Mounting Kit
Mercruiser parts lower gearcase

Mercruiser parts lower gearcase

12410 Water Pump Hsg
12810 Cup
89840 Impeller
23200 Retainer
12833 Screw
21180 Nut
12830 Seal
12820Tube Guide
81160 O Ring
21190 Nut
21720 Washer
11070 Key
31020 Gasket
12510 Wear Plate
31010 Gasket
12320 Water Pump Base
85040 Oil Seal
85070 Oil Seal
81390 O Ring (2.188 ID.)
82270 O Ring (2.125 ID.)
31050 Gasket
21580 Roller Bearing
23210 Shim
21800 Washer
30010 Gasket
85581 Oil Seal
21010 Bushing Assembly
81180 O Ring
32790 Washer
21132 Clip
21030 Shift Shaft
85140 Seal
21731 Screw
31170 Washer
21870 Insert (Starboard)
21880 Insert (Port)
12822 Screw
21161 Nut
21170 Nut
21740 Screw
22430 Screw
12670 Trim Tab
21610 Roller Bearing
11091 Forward Gear Set
11190 Nut
11030 Shift Spool

11040 Shift Crank
23220 Shim
21590 Bearing(LD. 1.875)
21591 Bearing (LD. 1.750)
11420 Bearing
11050 Spring
21131 Cross Pin
11060 Clutch
11155 Prop Shaft
11013 Reverse Gear
23140 Thrust Ring
21620 Ball Bearing
83445 O Ring
11410 Roller Bearing
11405 Bearing Carrier
85130 Oil Seal (inside)
85700 Oil Seal (outside)
32800 Washer
11381 Keyed Washer
21120 Cover Nut
21301 Thrust Hub
21760 Lockwasher
21360 Tab Washer Receiver
21200 Tab Washer
21230 Lock Nut
11120 Drive Shaft
21330 Slinger
21490 Washer
11012 Thrust Spacer
12702 Anode
11080 Key
21413 Dowel Pin
12120 Water Pump Kit
12290 Water Pump Service Kit
12754 Aluminum Anode Kit
87510 Gearcase Seal Kit