PERIODIC MAINTENANCE Option 1: Using Compressed air from main system or 12 V portable compressor. Using Yanmar Pump Refer to Preparing the Sail-Drive on page 42 and Fastest Way: Blowing Out by using Air Pressure on page 42 . 1. Connect a hose to the top adapter joint and to a compressed air source (Figure 5, (2)) . Within 10 to 15 minutes almost all oil will be blown out. (1) (2) (3) 0005454 0005455 Figure 7 Connect the hand pump with hoses as shown above (Figure 7) , and start pumping. Be aware that oil has to flow down through restricted parts of the casing and then back up again, so pressure will initially be high and pumping will be difficult. Pausing for a few minutes will help.
After pumping out about 0.9 L (1 qt) of oil, mostly you will be pumping out air, but continuous pumping is necessary. Though approximately 100 to 200 ml (0.1 to 0.2 qt) of old oil will remain in the drive unit, it will not cause a problem when mixed with clean oil. Figure 6 1 One-Way (Non-Return) Valve 2 Adapter Joint Screwed Into Cover 3 Foot Pump Option 2: Using Compressed air with help from a portable hand pump or foot pump 1. Install a one-way (non-return) valve (Figure 6, (1)) into the pressure line. This is done to maintain pressure during use of the pump. 2. Connect the hand pump or foot pump with pressure line to the adapter joint (Figure 6, (2)) . 3. Pump out the oil until empty.
The first 0.9 L (1 qt) will take approximately 3 minutes. The second part takes more time as mostly air will be pumped out; this will take approximately 12 minutes. The hand pump and rubber hose are available from Yanmar, and are optional parts for SD50 / SD50-4T. Any type of hand pump or rubber hose (inner diameter 14 to 16 mm [0.5 to 0.625 in.]) available from your local supplier can be used. SD Operation Manual 43 © 2009 Yanmar Marine International