Think i found my problem!! Tell me what to do!

[ifishhard]

OK WELLLLL I am having issues with water in my lower unit oil!! I am guessing a seal somewhere has gone bad. I just made an interesting discovery. I unscrewd my vent screw and noticed NO SEAL! My drain screw had a rubber seal on the screw itsself but my vent screw did not. However, i did notice something that apperead to be a seal but it was before the threads and it look like it was permanetly attatched to the unit. Kinduv like a washer. I tried to see if i could remove it but i couldnt. I think it permanetly on the lower unit. So would getting a seal for the vent screw fix my issue?? By the way, the guy that i bought the motor from had a new lower unit installed about 4yrs ago so it isnt the stock unit. Also, i noticed that a little piece was chipped off the the side of the vent seal hole. It isnt bad but it could possibly let water in!

 

[ezeke]

Re: Think i found my problem!! Tell me what to do!

The seals on the vent and fill screws are nylon washers and should be replaced each time the oil is changed. If the seal is missing or leaking it will explain the water.

You can buy the nylon seals in a bag of 50 if you want to keep them on hand. Sierra part # 18-42481-9 or:
http://www.iboats.com/Sierra_18_424...42481-9--**********.293013063--view_id.270527


Drain the unit in the running position, turning the prop a few times while draining to get rid of as much of the water as possible. Check the oil more frequently to be sure there is not more water getting in. You could have the gearcase pressure tested while you have the oil out.

 

[ifishhard]

Re: Think i found my problem!! Tell me what to do!

Ok...I did some more wrk on the engine today and here is what i came up with. the picture of the oil in the cups are when i drained the unit oil the 1st time, then the second cup is when i filled it back up and let it drain agian to try and flush some of the water out of the lower unit. I bought the boat probably 3 months ago and changed the oil in the lower unit when i got it. the oil that came out was worse then the pictures above! I noticed when i unscrewd the drain scew(the first time i ever changed it, when i bought the boat) that it wasnt REALLY tight agianst its housing. So i was thinking that my problem might be that issue! SO what i am wondering is this. Could it be possible that water was just left in the lower unit after the fist time i changed it and i am just slowly getting it out each time i change it, due to the last guy who owned the boat not seating the drain screw? OR is my problem elsewhere?? Also the other two pictures are my vent scew and vent hole in the lower unit. As you can see there is not seal on the screw; however, if you look at the pict. of the housing it appears the have a PERMANENT washer in it (tried taking it out and it want come out)...

 

[tashasdaddy]

Re: Think i found my problem!! Tell me what to do!

get the right seals. then try it. they were about 50 cents at the dealer.

 

[Gary H NC]

Re: Think i found my problem!! Tell me what to do!

get the right seals. then try it. they were about 50 cents at the dealer.

yep,The rubber O-rings just do not work! The white nylon washers are the only thing that seals it..