I have a Yanmar
4JH3E with a SD-40 sail drive. The sail drive is due for for a gear oil change
and I am changing it using the in-water procedure from the SD-50 operations manual. I have not found a manual for the SD-40 that describes a gear oil change
procedure. I have the appropriate fittings and have tried both the (suction) pump-out method and the (foot pump) blow-out method, and even a combination of the two. The gear oil
that comes out flows easily enough and after I get most all of the oil
I can get I can hear air gurgling through the sail drive. If I wait a few minutes a bit drips down somewhere and I can get out another half ounce to ounce.
The problem is that the sail drive data plate says the capacity is 1.8 liters and the manual says that the in-water procedure should be able to get it all out except for 0.2 to 0.3 liters. I am only getting out 600 to 700 mililiters. I have done it twice now with the same results.
HELP! What am I doing wrong?
S/V Meri - Tartan 4100