I was wondering how to change the power trim/tilt fluid on my 02 200hp ox66 motor. I unscrewed the cap and let the old trim tilt fluid drain out. I lowered and raised the motor a couple of times to get rid of any air build up. I tried to fill it with new trim and tilt fluid but i am not sure if I am getting enough in there. I would lower it, raise it, then add the fluid. I did this process several times but I am not sure how much is getting in there. I raised and lowered it a few times after I added the new fluid and it sounded fine. I tried it today and there was a very faint screech when I raised it but none when I lowered it. I was looking for another valve to let any air out but I didn't see any.
Basically all of this started because I thought my trim/tilt fluid was low because when the motor hit the two silver pins, there was chattering. After I did a little research today, an article mentioned that it might be chattering when the motor comes down on the two pins because there needs to be some marine grease on the ends of them. I looked today and they were pretty dry.
Any help would be appreciated. I tried looking for a service manual online but couldn't find any.
Cycle it up and down a few times. With the motor tilted all the way up, open the fill cap and let any air out. Fill the reservoir up level to the fill port. Put the cap back on and cycle it up and down a few more times. Check fluid level again. Add fluid if needed. Let us know how you make out.
I replaced some seals on mine and I could never completely bleed all the air out. My unit was still making noises when trimming up...like air in the system....so I'm draining out all the fluid (transmission type F) and buying some Yamaha fluid...the stuff that was in the unit before. I'll let you know if it works...
I think that I have a enough fluid in but the two pins making a screeching sound when it is pushing up the motor. I used the marine grease on the ends of the pins that took away the chattering noise when I lowered it. Do you know what would cause it to screech?
must be air in the system.... a lot of people have this problem when they drain and refill the unit. Even after following the bleed procedure I still had that screeching noise like yours. I noticed some small screws (allen key) in different places on the trim unit. I tried unscrewing them but they wouldnt move. Not sure if they have anything to do with proper bleeding?
Last edited by bassassasin; 04-17-2012 at 04:56 AM.
That is what I figured. I followed the procedure like I was supposed to. I noticed the small allen screws like you said. I haven't tried opening those at all but that might be the key to getting the air out.