Option 1: Using Compressed air from
main system or 12 V portable
compressor.
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.
0005454
(1)
(2)
(3)
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
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.
Using Yanmar Pump
Refer to Preparing the Sail-Drive on page
42 and Fastest Way: Blowing Out by using
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.
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.
PERIODIC MAINTENANCE
SD Operation Manual
43
© 2009 Yanmar Marine International
