hello,i just went to change the oil in the lower case on my 1984 johnson 35hp when i did this all thay came out was water.i changed it around 1 year ago.it has not been out in about 9 months and has been outdoors.what causes this and what seal or gasket needs to be replaced?and yes i ordered a manual fron ebay but is about 1 week away.is this a job that a person with little exper. on outboards can do.thanks