Lower Unit - TOHATSU MD 70-90C2 Service Manual

1. Special Tools .............................. 6-2
2. Parts Layout .............................. 6-4
Gear Case (Drive Shaft) ..................... 6-4
Gear Case (Propeller Shaft) ............... 6-6
3. Inspection Items ........................ 6-8
1) Draining Gear Oil ........................ 6-8
2) Removing Propeller ..................... 6-8
3) Removing Lower Unit .................. 6-9
4) Disassembly of Cam Rod ............ 6-9
5) Inspection of Clutch Cam ............ 6-10
6) Assembly of Clutch Cam Parts ...... 6-10
7) Removing Water Pump ............... 6-11
8) Inspection of Water Pump ............ 6-12
9) Disassembly of Water Pump Case (Lower) ... 6-13
10) Assembly of Water Pump Case (Lower) ... 6-14
11) Removing Propeller Shaft Housing Ass'y ... 6-15
12) Disassembly of Propeller Shaft Housing Ass'y ... 6-16
13) Inspection of Propeller Shaft Housing ... 6-17
14) Assembly of Propeller Shaft Housing ... 6-18
15) Disassembly of Propeller Shaft Ass'y ... 6-20
16) Inspection of Propeller Shaft Ass'y ... 6-21
17) Assembly of Propeller Shaft Ass'y ... 6-21
18) Removing Forward (A) Gear Ass'y ... 6-22
19) Disassembly of Forward Gear (A) Gear ... 6-23
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Lower Unit

20) Inspection of Forward (A) Gear ...... 6-23
21) Assembly of Forward (A) Gear Parts ... 6-24
22) Removing Drive Shaft Ass'y ......... 6-25
23) Disassembly of Drive Shaft Ass'y ... 6-26
24) Inspection of Drive Shaft............... 6-26
25) Inspection of Forward (A)
Gear and Pinion (B) Gear ............ 6-27
26) Assembly of Drive Shaft Parts ...... 6-27
27) Disassembly of Gear Case............ 6-28
28) Inspection of Gear Case ............... 6-29
29) Assembly of Gear Case Parts ...... 6-30
30) Measurement of Pinion (B) Gear
Height and Shim Selection ............ 6-32
31) Measurement of Back Lash between
Forward (A) and Pinion (B) Gears and
Shim Selection ........................... 6-34
32) Measurement of Back Lash between
Pinion (B) and Reverse (C) Gears and
Shim Selection ........................... 6-37
33) Assembly of Lower Unit Parts ...... 6-39
34) Attaching Clutch Cam Ass'y ......... 6-41
35) Measurement of Propeller Shaft Play and
Selection of Washer Thickness ............ 6-42
36) Installation of Lower Unit ............ 6-43
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