I need a little more info. about my Johnson 9.9

Michael P

Cadet
Joined
Apr 17, 2003
Messages
8
Last week I bought a Johnson 9.9 hp motor, model # 10R75C / serial # E4178758. I asked the forum the basic questions on age of the motor and oil/gas mixtures, to which Boatist replied with the necessary info. To that extent I followed Boatists recomendations and the motor started on the third pull and ran fine in a tub of water. My question this time is the particulars of filling the lower unit with lube.<br /><br />On the side of the motor as the shifter on the lower unit there is a hole with a screw that takes a straight bladed screw driver located adjacent the exaust ports. Lower on the unit there are two holes one with a straigt screw as above and one that has a phillips head screw. The lower screw is located below the prop shaft housing just above the skegg. <br /><br />My question is are the two holes with the straight screws the fill hole (upper hole) and the "run out when full" hole (lower hole)? If so it seems that there cant be a lot of oil at shaft level. It only took a couple of squeezes of oil for lube to come out the lower hole. On my 7.5 hp game fisher (1980 year model) the hole that oil comes out of when full is above the shaft housing. I just want to be sure that the lower hole is not the drain hole, if so I am not filling the lower unit with the proper amount of oil. Are any on line manuals available to look at untill my books arrive?<br /><br />Sorry about the length of the post and I hope I am making sense in my wording of the question.<br /><br />Thanks for any help.<br /><br />Mike
 

dkondelik

Chief Petty Officer
Joined
Sep 10, 2002
Messages
643
Re: I need a little more info. about my Johnson 9.9

Straight Blade is where you want to be. Philips is a big "DON'T TOUCH IT"as it pivots the shift dog/linkage.<br /><br />Top Straight is "Vent"<br />Bottom is Fill/Drain.<br />fill from the bottom. When full, place top, then bottom. Then remove top again and "top-it-off"<br /><br />Replace the seals (o-rings, plastic or fiber washers) when you service the lower.<br /><br />Much info on this board on this subject including inspecting old oil for metal shavings, water intrusion etc.<br /><br />Do a search on Lower Unit Service.<br /><br />Good Luck<br />HAVE FUN!
 

Michael P

Cadet
Joined
Apr 17, 2003
Messages
8
Re: I need a little more info. about my Johnson 9.9

Ok, so I had it backwards. I figured the phillips screw was a no no since it went all the way through...mess with it, let the magic smoke out and wala big trouble.<br /><br />I gotta say this forum is VERY helpfull!! You gotta love the net when you can find a site ask questions and get good straight answers.<br /><br />Thank you,<br /><br />Mike
 

Michael P

Cadet
Joined
Apr 17, 2003
Messages
8
Re: I need a little more info. about my Johnson 9.9

Rickdb1boat, thanks a ton for that link. Just the thing to lead this dumb country boy out of the dark and into the light.<br /><br />Mike
 
Top