Mercruiser Alpha 1 Gen 2 outdrive parts *Upper Lower gearcase

Boatparts.ca ( Click here for home page )

Mercruiser Alpha 1 Gen 2 lower unit parts drawing

Alpha One lower unit gearcase housing exploded view drawing

  • Mercruiser and Alpha One (up to 1990) exploded view lower unit parts drawing
  • Water pump components, impellers, seals and shafts
  • Manufactured by GLM, California. All parts include a 2 year warranty
  • Easy to identify photos with OEM Mercury numbers

Mercruiser Alpha 1 Gen 2 lower unit

Mercruiser Alpha 1 Gen 2 lower unit

Photo
Description / OEM #
Price
(USD)
Price (Canadian)
18300 Gen 2 Outdrive

28000 Gear housing assembly

#1 Gear housing assembly 1623-815822A30

$1431.95

$1889.95

85590 Face seal
85590 Face seal

#2 Face seal 26-816575A2

$4.95

$6.95

89630 Mercruiser water pump impeller
89630 Mercruiser water pump impeller

#3 Impeller 47-43026T2

$15.95

$20.95

31240 Gasket
31240 Gasket

#4 Gasket 27-817277-1

$4.95

$5.95

12500 Face plate

12500 Face plate

#5 Face plate 817276-1

$6.95

$8.95

30090 Gasket
30090 Gasket

#6 Gasket 27-43033-1

$4.95

$6.95

81390 O-ring
81390 O-ring

#7 O-ring 25-90011

$4.95

$6.95

85011 Oil seal
85011 Oil seal

#8 Oil seal 26-66302

$8.95

$11.95

23200 Mercruiser Retainer
23200 Mercruiser Retainer

#9 Retainer 824519-1

$4.95

$6.95

21580 Roller bearing
21580 Roller bearing

#10 Roller bearing (1991-1997) 31-36387A1

$40.95

$53.95

21584 Roller bearing
21584 Roller bearing

#10 Roller bearing (1998 & up) 31-33138A1

$41.95

$54.95

23210 Shim
23210 Shim

#11 Shim 15-42637A1

$16.95

$21.95

11140 Drive shaft

#12 Drive shaft 45-816919

$529.95

$699.95

85581 Oil seal
85581 Oil seal

#13 Oil seal 26-816464-1

$7.95

$9.95

81175 O-ring
81175 O-ring

#14 O-ring 25-896522

$4.95

$6.95

85140 Seal
85140 Seal

#15 Seal 26-45577-1

$4.95

$6.95

31170 Washer
31170 Washer

#16 Washer 12-19183-3

$4.95

$6.95

21731 Draining Screw
21731 Draining Screw

#17 Screw 22-8M0058389

$4.95

$6.95

21610 Pinion bearing
21610 Pinion bearing

#18 Roller bearing 31-42647A1

$35.95

$46.95

11091 Alpha1 Gen2 Forward gear set
11091 Alpha 1 Gen 2 Forward gear set

#19 Forward gear set (1991-95)

$629.95

$831.95

11092 Alpha1 Gen2 Forward gear set
11092 Alpha1 Gen2 Forward gear set

#19 Forward gear set (1996-up) 43-878087A2

$686.95

$906.95

32800 Washer
32800 Washer

#20 32800 Washer

$4.95

$6.95

11190 Pinion nut
11190 Pinion nut

#21 Pinion nut 11-35921

$4.95

$6.95

12710 Trim tab anode
12710 Trim tab anode

#22 Trim tab anode 76214Q5

$16.95

$21.95

11040 Shift crank
11040 Shift crank

#23 Shift crank 76865

$67.95

$89.95

11030 Mercruiser Alpha1 Gen2 Shift spool
11030 Mercruiser Alpha 1 Gen 2 Shift spool

#24 Shift spool 818349T1

$86.95

$114.95

23220 Mercruiser Shim
23220 Mercruiser Shim

#25 Shim (1991-95) 3.500 O.D. 15-47397A1

$11.95

$15.95

23221 Alpha1 Gen2 Shim
23221 Alpha 1 Gen 2 Shim

#25 Shim (1996-up) 3.265 O.D. 15-44491A1

$5.95

$7.95

21590 Bearing
21590 Bearing

#26 Bearing (1.875 I.D./3.500 O.D.) 31-35928T1

$59.95

$78.95

21591 Mercruiser Bearing
21591 Mercruiser Bearing

#26 Bearing (1.750 I.D./3.500 O.D.) 31-828437A2

$115.95

$152.95

21593 Bearing
21593 Bearing

#26 Bearing (1.875 I.D./3.265 O.D.) 31-828439A2

$128.95

$169.95

21820 Bearing

#26 Bearing (1.750 I.D./3.265 O.D.) 31-30894A1

$35.95

$46.95

11420 Roller bearing
11420 Roller bearing

#27 Roller bearing 31-30895T

$14.95

$19.95

11050 Spring
11050 Spring

#28 Spring 24-30893

$4.95

$6.95

21131 Cross pin
21131 Cross pin

#29 Cross pin 17-8M0020941

$4.95

$6.95

11060 Clutch
11060 Clutch

#30 Clutch 52-853594T

$225.95

$297.95

11155 Alpha 1 Gen 2 Prop shaft
11155 Alpha 1 Gen 2 Prop shaft

#31 Prop shaft 43-850308

$660.95

$871.95

11013 Mercruiser Reverse gear
11013 Mercruiser Reverse gear

#32 Mercruiser Reverse gear 43-828073A1

$250.95

$330.95

23140 Thrust ring
23140 Thrust ring

#33 Thrust ring 68100-1

$11.95

$15.95

21620 Ball bearing
21620 Ball bearing

#34 Ball bearing 30-88957T

$37.95

$49.95

83445 O-ring
83445 O-ring

#35 O-ring 25-896524

$4.95

$6.95

11410 Prop shaft bearing
11410 Roller bearing

#36 Roller bearing 31-30956T

$9.95

$12.95

85130 Oil seal
85130 Oil seal

#37 Oil seal 26-14077

$7.95

$9.95

85700 Oil seal
85700 Oil seal

#38 Oil seal 26-12224

$12.95

$16.95

11381 Tab washer
11381 Tab washer

#39 Tab washer 14-18323

$14.95

$19.95

21120 Cover nut
21120 Cover nut

#40 Cover nut 8M2011027

$18.95

$24.95

21301 Thrust hub

21301 Thrust hub

#41 Thrust hub 12-835467Q01

$21.95

$28.95

21760 Lock washer
21760 Lock washer

#42 Lock washer 13-42351-1

$4.95

$6.95

21360 Tab washer receiver
21360 Tab washer receiver

#43 Tab washer receiver 12-31211Q03

$6.95

$8.95

21200 Tab washer
21200 Tab washer

#44 Tab washer 14-816629Q

$4.95

$6.95

21250 Prop nut kit
21250 Prop nut kit

#45 Nut 11-52707Q1

$8.95

$11.95

11405 Bearing carrier

#46 Bearing carrier 818763A10

$157.95

$207.95

21031 Mercruiser Alpha 1 Gen 2 Lower shift shaft

#47 Mercruiser Alpha 1 Gen 2 Lower shift shaft 815919A1

$56.95

$74.95

85850 Sleeve

#48 Sleeve 26-42133

   
11071 Key
11071 Key

#49 Key 28-43037

$4.95

$6.95

12341 Carrier assembly pump housing
12341 Carrier assembly pump housing

#50 Carrier assembly pump housing 807929A1

$22.95

$29.95

21015 Shift bushing

#51 Shift bushing 23-815921A21

$19.95

$25.95

12702 Anode assembly
12702 Anode assembly

#52 Anode assembly 806105Q1

$39.95

$52.95

12824 Coupling assembly
12824 Coupling assembly

#53 Coupling assembly 816597A1

$9.95

$12.95

12825 Guide tube
12825 Guide tube

#54 Guide tube 23-816583

$4.95

$6.95

12834 Screw
12834 Screw

#55 Screw 10-816928

$4.95

$6.95

21741 Screw
21741 Screw

#56 Screw 10-806327

$4.95

$6.95

21136 E-ring
21136 E-ring

#57 E-ring 53-29641

$4.95

$6.95

82110 O-ring
82110 O-ring

#58 O-ring 25-21836

   
11012 Thrust spacer
11012 Thrust spacer

#59 Thrust spacer 23-824108

$4.95

$6.95

88180 Filler block
88180 Filler block

#60 Filler block 821526

   
12832 Screw
12832 Screw

#61 Screw 10-806290

$4.95

$6.95

21491 Lockwasher
21491 Lockwasher

#62 Lockwasher 13-69432

$4.95

$6.95

12413 Pump housing
12413 Pump housing

#63 Pump housing

   
12414 Water pump kit
12414 Water pump kit

#64 Complete water pump kit 817275Q5

$109.95

$144.95

12043 Water pump service kit
12043 Water pump service kit

#65 Water pump service kit 47-43026Q06

$37.95

$49.95

12722 Aluminum anode kit
12722 Aluminum anode kit

#66 Aluminum anode kit 888756Q03

$30.95

$40.95

87511 Alpha 1 Gen 2 Gearcase seal kit
87511 Alpha 1 Gen 2 Gearcase seal kit

#67 Alpha 1 Gen 2 Gearcase seal kit 26-816575A3

$35.95

$46.95

12834 Screw
12834 Screw

#68 Screw 10-40003-27

$4.95

$6.95