Alpha 1 and Generation 2 Outdrive Parts Drawings

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Alpha 1 parts drawing (lower unit) P/N 1-34

GLM Marine aftermarket lower gearcase stern drive parts.
Exploded view outdrive drawings.

  • All GLM products are brand new completely compatible and interchangeable with Mercruiser Alpha One parts. GLM has committed to producing high quality and cost effective aftermarket parts for the past two decades
  • Upper gear case exploded view Alpha One drawings click here

Exploded view parts drawings
Search by part number or description here

Alpha one lower gear case layout drawing

Alpha one lower gear case layout drawing

Picture

Description

87510 seal kit
87510 seal kit

A
P/N 87510
 Seal kit (lower unit) gear-case 26-33144A2 $43.00

25125 seals gears bearings shims 13-21
25125 seals gears bearings shims 13-21
B
P/N 25125
 Seal, bearing and gear set 43-803091T1 $661.89

25120
25120
C
P/N 25120
Seal and bearing set with P/N 21570 upper bearing $224.89

12120 water pump
12120 water pump
D
P/N 12120
Water pump set $37.29

18000
18000
1
P/N 18000
Lower gear housing (Case only) $736.89

18100 complete
18100 complete
P/N 18100 GLM Marine aftermarket lower unit replacement outdrive complete assembly years 1972 to 1990 $1149.89

12410 housing
12410 housing

2
P/N 12410 Water pump housing $30.89

12810 cup
12810 cup
3
P/N 12810
Cup $5.09

89840 impeller

4
P/N 89840
Water pump impeller $18.89

23200 retainer
23200 retainer
5
P/N
Retainer for drive shaft bearing 824519-1 $4.89

12833 screw
12833 screw
6
P/N 12833
Screw for wear plate cover 10-96411 $4.89

21180 lock nuts
21180 lock nuts
7
P/N 21180
Lock nuts (5) 11-13438 $6.09

12830 seal

12830 seal

8
P/N 12830 Seal

12820 guide tube
12820 guide tube
9
P/N 12820
Tube guide
81160 o ring for drive shaft

81160 o ring for drive shaft

10
P/N 81160 o ring (5)
21190 lock nuts

21190 lock nuts

11
P/N 21190
Lock nuts (5) 11-13436 $8.09

21720 washers
21720 washers
12
P/N 21720 Washer set (3) 12-36001 $4.89

11070 Impeller key

11070 Impeller key

13
P/N 11070
Impeller keys (1) 28-56654 $4.89

31020
31020
14
P/N 31020
Gasket
12510 impeller wear plate
12510 impeller wear plate
15
P/N 12510 Wear plate
 
16
P/N 31010 Gasket for wear plate
12320 base
12320 base
17
P/N 12320
Water pump base
85040 oil seal
85040 oil seal
18
P/N 85040
Oil seal
85070
85070
19
P/N 85070
Oil seal $9.89

 
20
P/N 81390 o ring
82270 o ring
82270 o ring
20B
P/N 82270
Water pump o ring
21580 bearing

21580 bearing

22
P/N 21580
Tapered roller bearing for drive shaft MR/Alpha One/Gen 2 OEM 31-36387A1 $35.89

23210 drive shaft bearing shim kit
23210 drive shaft bearing shim set
23
P/N 23210
Shims 15-42637A1 $5.89

21800 washers
21800 washers

24
P/N 21800
Washer set (5) 12-29395 $4.89

30010 outdrive gasket

30010 outdrive gasket

25
30010
Washer gaskets OEM# 12-31266 $4.89

85581 oil seal
85581 oil seal

26
P/N 85581
Oil Seal

21010 bushing assembly
21010 bushing assembly
27
P/N 21010
Shift bushing assembly
81180 o ring
81180 o ring
28
P/N 81180
O-Ring
32790 washers
32790 washers
29
P/N 32790
Washer set (10) 12-27880 $4.89

21132 outdrive clip
21132 outdrive clip
30
P/N 21132
Clip 18-20233

21030 lower shift shaft
21030 lower shift shaft
31
P/N 21030
Shift shaft 77481-1 $25.89

17
85140 oil passage seal
85140 oil passage seal
32
P/N 85140
Oil passage seal (5) 26-45577-1 $9.89

21731 draining screw set
21731 draining screw set
33
P/N 21731
Oil plug drain screw magnetic 22-67892A1 $5.89

31170
31170
34 # 31170 Washer

Alpha 1 lower gear-case exploded view parts drawing
Parts 35 - 55
56 - 77