1999 merc 90 h.p. t&t locked

[cedarhill dockrat]

i pulled my deck boat out of the slip today to give it a good clean-up. the t&t has always been noisy ( grinding sound ) and when igot it home started tilting it down and almost to the bottom it locked up and won't go up or down. any suggestions. how can i get it back up to take it to the dealership? i just hope it's not something real exspensive, it's always something with a boat. B.O.A.T. ( bring out another thousand) help!!!!!<br />thanks in advance, dockrat

 

[jt57]

Re: 1999 merc 90 h.p. t&t locked

sounds like maybe your trim motor has went out.some merc motors have a relief screw that you can loosen to raise the motor by hand.

 

[Bob Kimber]

Re: 1999 merc 90 h.p. t&t locked

Assuming it is your trim motor that has failed and not the trim cylinders locked up, you can manually tilt motor by loosening tilt release valve screw 3 turns (clockwise). the screw is located at the bottom of the trim motor and is accessed through a hole at the bottom of the mounting bracket on the right hand side of motor, if you kneel down to look through hole in bracket you will see a fairly large slotted plastic screw plug, raise motor to your desired position and retighten screw plug to lock.<br /><br />the motor can be used in the same situation if the trim motor fails by using the same procedure (it is critical the screw plug be tightened before operating motor)<br />Bob

 

[Keith Buchanan]

Re: 1999 merc 90 h.p. t&t locked

Had same symptoms a while ago, water had ingressed into trim motor, after pulling it apart I found one of the fixed magnets had un-bonded itself from the outer casing and had stuck itself to the armature, I found with ease that the other magnet also came away from the outer casing. After marking the polarity and possitions of the magnets I cleaned away all the residue of dried glue and used wire wool to clean the inside of the casing. Carefully glued the magnets back into original position, while I was in there I changed the brushes and cleaned the commutator, re-greased and reassembled. It worked like brand new..Found out where the water was getting in, half way up the cable that feeds the motor there was a crack in the outer insulation and water was going down the inside of the cable... When I first saw the sorry mess I thought it was going to cost but you never know untill you try..<br /><br />Best of luck, let us know how you get on..Keith B..