Alpha One & Gen 2 Outdrive Parts *Drawings *Videos

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Mercruiser Alpha 1 parts drawing *Upper gearcase

GLM Marine aftermarket upper gearcase stern drive parts
Comprehensive exploded view outdrive tech drawing

  • All GLM products are completely compatible and interchangeable with OEM parts. GLM has committed to producing high quality and cost effective aftermarket parts for the past two decades
  • If help or part numbers are required, contact our service tech for advice troubleshooting your sterndrive unit at (416) 751-7326
  • R MR, Mercruiser Alpha one and 2 repair tools
  • Bell housing drawing

Mercruiser Alpha One upper gearcase

Mercruiser Alpha One upper gearcase

 

Click on video for upper gearcase repair help
87500 Seal kit parts
87500 Seal kit parts
A
P/N 87500
GLM Marine aftermarket seal kit for upper gear-case $24.99

39622 OMC Bell housing gasket kit
39622 OMC Bell housing gasket kit
B
P/N 39622 OEM 27-94996Q2 $9.95 (This gasket is required to install the outdrive back onto the bell housing)

19000 Upper gearcase
19000 Upper gearcase
1A
P/N 19000 Empty drive shaft housing / 1547-9412A18
upper gearcase assembly 20-22
upper gear case assembly 20 22
1C
P/N SE106-116 Complete SEI Marine upper housings (all ratios available) (new) 1547-9412A20 $1199.99

MA-28400-Alpha-One-Assembly-94998A4.jpg
28400 cover assembly
P/N 28400 Cover assembly with parts
94998A4 Top comes with P/N 21511,
shim P/N 23261 and 4 bolts $125.99
 
*Compatible with models from late 1983 to 1990 only

21510 Alpha 1 bearing cover 1-15-16
21510 Alpha 1 bearing cover 1-15-16
5A
P/N 21510
upper cover tapered assembly O.D. 1-15/16" OEM 31-61100A1 $33.99

21511 Alpha 1 bearing cover 1 25-32
21511 Alpha 1 bearing cover 1 25-32
5B
P/N 21511
Roller bearing for upper cover assembly O.D. 1-25/32"
31-32575A1 $12.99

11130 Alpha 1 upper drive shaft
11130 Alpha 1 upper drive shaft
6
P/N 11130 Upper drive shaft / 45-55796 $96.99

80420 Alpha 1 O-ring
80190 Alpha 1 O-ring

11210 Alpha 1 gear set V8 22-20 gear ratio
11210 Alpha 1 gear set V8 22-20 gear ratio
8A
P/N 11210
V8 heavy duty 20/22 Gears for Alpha 1 and generation 2 with HD P/N 21560 included / 43-18411A2
$399.99 ratio 1.50-1.47 ratio / 20/22 gears

11220 Alpha 1 gear set 24-24 1970-1997 6 cylinder
11220 Alpha 1 gear set 24-24 1970-1997 6 cylinder
8B
P/N 11220
6 Cylinder inline upper gear set (1.65 or 1.62 Ratio) 24-24 years 1970 to 1997 / 43-45814A5 $275.99

11230 Alpha 1 gear set ratio 17-19 V-6 470-485
11230 Alpha 1 gear set ratio 17-19 V-6 470-485
8C
P/N 11230
V6 and 470/485 model upper gear set ratio. 1.81-1.84 / 17/19 gears / 43-75325A3 $337.99

11240 Alpha 1 gear set 20-24 ratio 1.98 4 cylinder
11240 Alpha 1 gear set 20-24 ratio 1.98 4 cylinder
8D
P/N 11240
4 Cylinder inline, gear ratio 20/24 upper unit gear set (1.98 or 1.94 Ratio) 43-55778A3 $332.99

21560 Alpha bearing for 1.50 gear ratio
21560 Alpha bearing for 1.50 gear ratio
9A
P/N 21560 bearing tapered roller (1.50 ratio) 31-32573A1 $47.99

21540 Alpha bearing 1.65 1.84 1.98 gear ratio
21540 Alpha bearing 1.65 1.84 1.98 gear ratio
9B
P/N 21540 roller type (1.65, 1.84, 1.98 Ratio), replaces Mercury part number 31-35990A1 $39.99

21550 - 1.32 ratio bearing

21550 - 1.32 ratio bearing

9C
P/N 21550
Roller bearing for Mercruiser Alpha 17/19 gear set (1.32 Ratio) 31-66818A1 $75.95

23270 Alpha 1 driven gear bearing shim
23270 Alpha 1 driven gear bearing shim
10
P/S 23270
Shims / 15-36178A1 $11.99

85020 Oil seal upper gearcase driven gear

85020 Oil seal upper gearcase driven gear

11
P/N 85020
Oil seal $11.95

85060 OMC Alpha 1 Oil seal

85060 OMC Alpha 1 Oil seal

12
P/N 85060
Oil seal $11.99

28050 Mercruiser socket yoke drive shaft nut

28050 Mercruiser socket yoke drive shaft nut

14
P/N 28050
U joint assembly / 814819A2 $499.99

28315 Alpha 1 drive shaft yoke
28315 Alpha 1 drive shaft yoke
28030 Alpha 1 U-joint
28030 Alpha 1 U-joint
16A
P/N 28030
Heavy duty Rockwell u joints replaces part number 75832T-1 $51.99

28100 Alpha Generation 2 socket
28100 Alpha Generation 2 socket
17
P/N 28100
Socket for yoke $79.99

28310 Alpha 1 Yoke shaft
28310 Alpha 1 Yoke shaft
18
P/N 28310 Yoke, 1970-1997 models / 46020-1 $79.99

28350 Alpha Generation 2 bearing retainer nut
28350 Alpha Generation 2 bearing retainer nut
19
P/N 28350
Retainer nut / 816811-1 $26.99

28390 Alpha Generation 2 ring
28390 Alpha Generation 2 ring
20
P/N 28390 Upper gear-case ring $13.99

82380 OMC O-ring

82380 OMC O-ring

21
P/N 82380
O ring

28370 Alpha Generation 2 bearing carrier assembly

28370 Alpha Generation 2 bearing carrier assembly

22
P/N 28370 Carrier assembly / 66081A2 $43.99

85030 Alpha 1 oil seal

85030 Alpha 1 oil seal

23
P/N 85030
Oil seal - for yoke $14.99

21520 Alpha 1 bearing set
21520 Alpha 1 bearing set
24A
P/N 21520
Roller bearing (All Ratio except 1.32), 1964-1997 models. 31-35988A2 $179.99

23280 Alpha 1 shim kit
23280 Alpha 1 shim kit
25
P/N 23280
Double bearing shims (6 units) 15-35980A1 $10.95

28380 Alpha 1 Spacer

28380 Alpha 1 Spacer

26
P/N 28380 Spacer / 15-71013 Two units $9.99

28330 Alpha 1 tension washer
28330 Alpha 1 tension washer
27
P/N 28330 Tension washer / 12-45810 $4.95

28360 Alpha Generation 2 nut
28360 Alpha Generation 2 nut
28
P/N 28360 Lock nut / 11-22339 $4.95

21731 Draining screw plug OEM 22-67892A1

21731 Draining screw plug OEM 22-67892A1

29
P/N 21731
Magnetic drain screw. Same screw is used in the lower units. $9.95

31170 Mercruiser seal gasket

31170 Mercruiser seal gasket

30
P/N 31170
Washer $9.99

28300 Alpha Generation 2 screw
28300 screw
31
P/N 28300 Cover screw / 10-98794 $4.95

21890 Alpha 1 plug
21890 plug
32
P/N 21890 Plug / 19-47579 $4.95

21170 Alpha 1 lock nuts
21170 lock nuts
33
P/N 21170
Lock nuts (5) 11-13439-1 $15.99

31150 Water pump gasket

31150 Water pump gasket

34
P/N 31150
gasket (5 units) for water cover pocket (Included in seal kit) $9.95

22440 Alpha 1 screw
22440 screw
35
P/N 22440
water pocket screw / 10-28668 $4.95

Pocket cover tube passage 12200
Pocket cover tube passage 12200

36
P/N 12200 pocket cover kit. Replaces 42724A3, Sierra 18-3219. $32.99

21423 Alpha 1 bushing

21423 Alpha 1 bushing

37
P/N 21423 Bushing / 23-32632 $20.95

 
38
Grommet

12202 Water Tube

12202 Water Tube

39
Copper tube
22031 Alpha 1 welch plug 1.250 inch
22031 Alpha 1 welch plug 1.250 inch
40
P/N 22031
welch plug (1-1/4"O.D.) 19-42682 $4.95

22032 Mercruiser pipe plug

22032 Mercruiser pipe plug

41
P/N 22032 Pipe plug OEM 22-42861-1 plug $6.99