1989 Yamaha 90HP trim/till unit squealing using trim

[Greger2]

Just bought this 1989 Yamaha 90hp. Trim/till has a problem only during operation in trim positions.

Out of the water the squeal/chatter only happens at the start of a lower position of the motor (while the trim rods are touching) then trimming out, but has to have been lowered before, once it is moved up from an initial position the noise won't happen unless lowered to any trim position again, When the rods aren't touching all is good (rod tips have been greased).

While in the water and moving, the squealing happens when holding trim control button down or just bumping it to move up or down, (in trim position only). Strangely.. the noise problem doesn't always happen in the water unlike out of the water system is every time I make it act up.

I have done the air bleeding in manual/release mode 5 times up n down probably. The fluid was always full, clean, and never lowered while bleeding.

Observation....... out of water, there is much chatter/vibration touching the upper hydraulic line, (comes off big cylinder) at the start of powering motor up. Once out of that initial 1 second going up all is smooth, (louder at lowest start position) but the noise and feel are significant.

Oh, I have pulled, cleaned, and greased the large pin at top of cylinder shaft, also tried loosening the tilt tube with no luck.

I appreciate any suggestions to this problem, thank you.

 

[sigma]

Re: 1989 Yamaha 90HP trim/till unit squealing using trim

Do you think its a fluid noise or a metal to metal mechanical thing?


If it sounds like it's forcing fluid with air bubbles in it add two ounces of straight 30 weight non detergent motor oil to the fluid and give it a few trips.

 

[Greger2]

Re: 1989 Yamaha 90HP trim/till unit squealing using trim

Well..... it sounds like a loud enough noise to be metal or mechanical, but I've been told and read as you mention, AIR in lines.

I'll try anything at this point, I've got some 30 wieght oil, please tell me how to put it in when the fluid is full.

 

[sigma]

Re: 1989 Yamaha 90HP trim/till unit squealing using trim

Well..... it sounds like a loud enough noise to be metal or mechanical, but I've been told and read as you mention, AIR in lines.

I'll try anything at this point, I've got some 30 wieght oil, please tell me how to put it in when the fluid is full.

Either suck it out or take the cap off and change the angle of the trailer so it runs out.

 

[4fish]

Re: 1989 Yamaha 90HP trim/till unit squealing using trim

I found the problem to be the trim motor itself. When i took mine apart it was loaded with rust and just generally ugly New motors are stupidly expensive
good luck

 

[Greger2]

Re: 1989 Yamaha 90HP trim/till unit squealing using trim

Not motor, the motor runs great.

 

[Greger2]

Re: 1989 Yamaha 90HP trim/till unit squealing using trim

Either suck it out or take the cap off and change the angle of the trailer so it runs out.

I put the 30 wieght oil in and little if any changed.
Over the weekend I took the boat/motor to a ourboard motor Mech. of some 30 yrs in this area. He told me it was most likely air and to not worry so much that it's only a boat and to just keep running it as the air will work it's way out.

I guess I'll give it time, as I have been for a month already. Everything I read in forums like this one say that if a trim/till makes that kind of noise it needs attention BCS other things can go wrong.

I hate to wait for the latter!