Alpha 1 and Generation 2 Outdrive Parts Drawings

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Alpha 1 lower unit parts drawing items 1 to 34

GLM Marine aftermarket lower gearcase stern drive parts. Printer friendly comprehensive exploded outdrive tech 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
  • Alpha 1 upper gear case exploded view drawing Click here
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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 Alpha one seal kit lower gear-case OEM 26-33144A2 $43.00

25125 seals gears bearings shims 13-21
25125 seals gears bearings shims 13-21
B
P/N 25125 Alpha One seal, bearing and gear kit OEM 43-803091T1 $661.89

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

12120 water pump
12120 water pump
D
P/N 12120 Alpha One water pump kit $37.29

18000
18000
1
P/N 18000 Lower gear housing for the Alpha 1 stern-drive (Case only) $736.89

18100 complete
18100 complete
1

P/N 18100 GLM Marine aftermarket Mercruiser Alpha 1 lower gear housing lower unit outdrive complete assembly years 1972 to 1990 $1149.89

12410 housing
12410 housing
2
P/N 12410 Water pump housing (Included in water pump kit) $30.89

12810 cup
12810 cup

3
P/N 12810
Cup (*NOT included in water pump kit) $5.09

89840 impeller
89840 impeller
4
P/N 89840 Water pump impeller (Included in water pump kit) $18.89

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

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

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

12830 seal
12830 seal

8
P/N 12830 Seal (Included in water pump kit)

12820 guide tube
12820 guide tube

9
P/N 12820 Tube guide (Included in water pump kit)

81160 o ring for drive shaft
81160 o ring for drive shaft
10
P/N 81160 o ring (5 units) (Included in water pump kit)
21190 lock nuts
21190 lock nuts
11
P/N 21190 Lock nuts (5 units) OEM 11-13436 $8.09

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

11070 Impeller key
11070 Impeller key
13
P/N 11070 Impeller keys (1unit) OEM 28-56654 $4.89
31020
31020

14
P/N 31020
Gasket (Included in water pump kit)

12510 impeller wear plate
12510 impeller wear plate
15
P/N 12510 Wear plate (Included in water pump kit)
 
16
P/N 31010 Gasket for wear plate (Included in water pump kit)
12320 base
12320 base
17
P/N 12320 Water pump base (Included in water pump kit)
85040 oil seal
85040 oil seal
18
P/N
85040 Oil seal (Included in water pump kit)
85070
85070
19
P/N 85070 Oil seal $9.89

 
20
P/N 81390 o ring (Included in water pump kit)
82270 o ring
82270 o ring

20B
P/N 82270
Water pump o ring (Included in water pump kit)

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 kit
23
P/N 23210
Shims OEM 15-42637A1 $5.89

21800 washers
21800 washers
24
P/N 21800
Washer set (5 units) OEM 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
(Included in seal kit)
21010 bushing assembly
21010 bushing assembly
27
P/N 21010 Shift bushing assembly (Included in seal kit)
81180 o ring
81180 o ring

28
P/N 81180
O-Ring (Included in seal kit)

32790 washers
32790 washers
29
P/N
32790 Washer set (10 units) OEM 12-27880 $4.89

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

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

17
85140 oil passage seal
85140 oil passage seal
32
P/N 85140 Oil passage seal (5 units) OEM 26-45577-1 (Included in seal kit) $9.89

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

31170
31170
34 # 31170 Washer (Included in seal kit)

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

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