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1. HOW TO INSTALL THE SYSTEM
1-4
1.1.3 How to install the Hull Unit on the retraction tank
Weld the retraction tank and allow sufficient time for cooling. Install the hull unit as fol-
lows:
Prepare the materials and tools as shown below.
1. Clean the flange and O-ring groove of the retraction tank (welded to hull) with ethyl
alcohol moistened waste cloths. Coat O-ring and O-ring groove with lithium
grease. Place the O-ring in its groove on the tank flange.
2. Orient the hull unit so that the bow mark (inscribed) on its flange points toward the
ship's bow. Note that heading adjustment is required if the bow mark is not facing
the ship's bow.
3. Confirm the following points as below and place the hull unit on the tank.
• Clean the flange platform.
• Wipe the undersurface of the hull unit flange with clean waste cloths.
• Keep O-ring in its groove.
4. Coat the threads of the bolts with a slight amount of lithium grease to prevent
scorching. Insert the bolts with washers from the retraction tank flange, and then
put the flat washers and spring washers in this order from above. Fasten bolts with
nuts.
5. Reinforce the hull unit against vibration by extending stays to the ship's hull from
the two eye-nuts at the top of the hull unit, referring to the procedure on page 1-5.
Name Remarks
Screw wrench M20 (opposite side 30 mm)
Ethyl alcohol 99.5%
Waste cloths
Lithium grease For O-ring
Common lithium grease (the equivalent of Daphne Eponex Grease #2)
Molytone grease For drive shaft
Molytone grease #2 (by SUMICO LUBRICANT CO., LTD)