EVINRUDE TRIM PROBLEMS

[Tempest16]

I have a 1979 Evinrude 100hp. My tilt/trim has been acting up on me and it's been an endless effort to try to make it work again. The tilt will go up fine, but the tilt or trim will not go down. I have filled fluid and the motor still runs fine when pressing the down switch. I have now removed the entire unit and am working on it. If this is a common problem anyone let me know any information you have at all!<br />Thanks

 

[OBJ]

Re: EVINRUDE TRIM PROBLEMS

Tempest...will it go down OK if you open the manual release?<br /><br />Sounds like ya' got a stuck valve inside. These valves are hidden behind the large screw heads on the unit. A good flushing out won't hurt either.<br /><br />What ya' need to do is get a service manual and follow the instructions in it. Save ya' lotsa time.

 

[Joe Reeves]

Re: EVINRUDE TRIM PROBLEMS

The up mode is absolute hydraulic pressure on the tilt/trim pistons.<br /><br />The down mode, pertaining to tilt, depends on gravity for the engine to lower in the tilt down mode (not the trim down mode).<br /><br />There are times when the steering tube becomes too tight for the engine to drift down in the down mode. When this tight steering tube scenario takes place (engine is fully tilted up), the PTT electric motor runs normally but instead of the engine lowering, the "Trim Rams" pull in first, then when the trim rams are fully retracted, hydraulic pressure is exerted on the top of the tilt cylinder piston forcing the tilt cylinder to lower the engine regardless of the tight steering tube.<br /><br />If the above applies.... loosening one of the steering tube nuts 1/2 turn, greasing the two associated fittings, and spraying the moving joint areas with WD40 or some such substance usually cures the problem.

 

[Tempest16]

Re: EVINRUDE TRIM PROBLEMS

Thanks for the tips guys<br />Joe, I will keep that tip in mind, the thing is the trim rams will not retract either. The motor tuns but nothing will move down. OBJ, yes it will go down with the manual release valve. I have a service manual which tells me which valves it could be, but no instructions on how to check if they are damaged. I have had them out to look at, but thats it. Would simply removing them and putting them back in help cure a stuck valve?

 

[venture22]

Re: EVINRUDE TRIM PROBLEMS

Thanks to Joe Reeves I just saved a bunch of time and effort. Power tilt did exactly like he said. On the way down though the engine did not go down smoothly. It gets hung up and then jerks to the new position. Still haven't tried the suggested solution, but now I know the problem. Looks like tube and nuts are very rusty. I will try later this morning. I have hydraulic steering on this boat, so I don't think the tube is actually used for steering? Thanks again, Bert.